CN101870011A - Numerical control pipe lathe - Google Patents

Numerical control pipe lathe Download PDF

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Publication number
CN101870011A
CN101870011A CN201010195476A CN201010195476A CN101870011A CN 101870011 A CN101870011 A CN 101870011A CN 201010195476 A CN201010195476 A CN 201010195476A CN 201010195476 A CN201010195476 A CN 201010195476A CN 101870011 A CN101870011 A CN 101870011A
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main
radial feed
connects
output
radial
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CN101870011B (en
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王宏
刘胜
代晓进
常军
田振强
俞伟源
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LANZHOU MACHINE TOOL PLANT
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LANZHOU MACHINE TOOL PLANT
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Abstract

The invention relates to a structure of a pipe lathe. The numerical control pipe lathe comprises a main body, wherein one end of the main body is provided with a main spindle box, and the other end is provided with a pipe clamping device. The invention is mainly characterized in that the outer side of the main spindle box is provided with a main motor, the output shaft of the main motor engages with a main drive gearwheel through an output gear of a variable-speed gear, the main drive gearwheel is fixedly connected with the main shaft, and the end of the main shaft is fixedly connected with a flat turning disc; a radial feed dive shaft is arranged in an inner hole of the main shaft and is coaxial with the main shaft, a tail of the radial feed dive shaft is provided with a feed servomotor, and the tail end of the radial feed dive shaft is fixed with a driving bevel gear of a bevel gear pair; a driven bevel gear of the bevel gear pair is fixed to a radial feed screw, and the radial feed screw is fixedly connected with the flat turning disc; a sliding plate is fixedly connected to a nut which cooperates with the radial feed screw, and a radial tool rest is arranged on the sliding plate; and a rotary encoder is fixedly connected with the main shaft through a synchronous cog belt mechanism.

Description

Numerical-control tube lathe
Technical field:
The present invention relates to a kind of structure of pipe lathe.
Background technology:
Numerical-control tube lathe is a kind of lathe of special processing tube screw thread, at present, to be clamping workpiece at two chucks of main shaft be installed in the main axis rotation cutter gas pipe thread processing mode that is used for generally adopting makes the straight line parallel or vertical with tube axis on the knife rest and move, adopt the gas pipe thread machining tool of kind of form, if processing pipe fitting bore is big (more than the Φ 200mm) and long (during 5000~10000mm) pipe, there is big defective: because pipe fitting is long, quality is big, pipe must pass from the alignment of shafts, adopt two chucks large scale pipe that is installed, operation is difficulty relatively, if main shaft drives pipe and rotates, can produce very big vibration, influence machining accuracy and surface quality, also be difficult to enhance productivity.
Also there is enterprise to develop pipe for this reason and do not rotate and the gas pipe thread machining tool of cutter rotary cutting, but this lathe of introducing according to data, can radial feed when realizing the cutter rotation, all the frame for movement differential attachment is set at the radial feed driving-chain.Its objective is that the function by the frame for movement differential attachment realizes that if the radial feed motor does not change, cutter can not produce and move radially when cutter rotates.When the rotary speed of control radial feed motor, do not consider the influence of cutter rotation.The advantage that adopts the frame for movement differential attachment is that the rotary speed of radial feed motor is controlled easily, still, because the problem that exists the manufacture difficulty that has increased the machine tool mechanical structure of frame for movement differential attachment; Simultaneously, because the existence of frame for movement differential attachment has increased the transmission link of feeding driving-chain, increased driving error.
Summary of the invention:
The objective of the invention is to avoid the deficiencies in the prior art, a kind of numerical-control tube lathe is provided, pipe is motionless, and cutter rotates and possess the Digit Control Machine Tool of radial feed function, and this lathe can be realized the radial feed of cutter in the cutter rotation.Thereby, realize carrying out turning processing such as turning, face work, cutting thread, chamfering, grooving under the fixed situation of pipe.The present invention realizes this lathe function, but does not adopt the frame for movement differential attachment in the feeding driving-chain, but by digital control system, by the function of software realization differential attachment, replaces mechanical drive train with the electronics driving-chain.Simplify frame for movement, reduced the machine error of feeding driving-chain.
For achieving the above object, the technical scheme that the present invention takes is: a kind of numerical-control tube lathe, include lathe bed (18), end at lathe bed (18) is provided with main spindle box (4), be provided with pipe clamping device (14) at the other end, its main feature is that machine driving includes in the outside of lathe headstock (4) and is provided with main motor (1), the output shaft of main motor (1) is by the output gear and main transmission gear wheel (7) engagement of speed change gear, main transmission gear wheel (7) is connected with main shaft (6), and the end of main shaft (6) is fixed with facing head (9); Radial feed power transmission shaft (5) is located in the endoporus of main shaft (6), with main shaft (6) be same axis, its afterbody is provided with radial feed servomotor (2), the drive bevel gear of the end of radial feed power transmission shaft (5) and bevel gear pair (10) is connected.The driven wheel of differential of bevel gear pair (10) is fixed on radial feed screw (20), and radial feed screw (20) is connected with facing head (9); Slide plate (11) be fixed on radial feed screw (20) nut engaged on, slide plate (11) is provided with radial tool post (12); Rotary encoder (19) is connected with main shaft (6) by synchronous cog belt mechanism (21).
Described numerical-control tube lathe, described pipe clamping device (14) are located at can be realized on the self centering anchor clamps slide plate (15).
Described numerical-control tube lathe, also include the motion composite control apparatus of radial feed motion, the motion composite control apparatus of described radial feed motion is that man-machine interface (101) is connected with digital control system (102), the interface of digital control system (102) connects main motor (103), radial feed motor (104) and axial feed motor (115), the output of main motor (103) connects motion combination mechanism (108) by connecting main transmission chain (105), and the output of radial feed motor (104) connects motion combination mechanism (108) by connecting feeding driving-chain (106); Axial feed motor (115) output connects main spindle box slide plate (112) and connects knife rest (111) by connecting axial feed driving-chain (114) connecting axle to feed screw (113); Rotary encoder (107) is connected the end of main transmission chain (105), and the value of angular displacement of main shaft is transferred to digital control system (102); The displacement of main spindle box slide plate (112) is given digital control system (102) by position sensor (117) with feedback information, and motion combination mechanism (108) connects knife rest (111) by bevel gear (109), radial feed screw (110).Position-detection sensor (116) detects the positional precision of knife rest (111) and is transferred to digital control system (102) under the state that lathe is shut down.
Described numerical-control tube lathe, include numerical control device, described numerical control device includes man-machine interface (201) and is connected with digital control system (202), the output connecting interface (203) of digital control system (202), the output of interface (203) connects main motor (205), axial feed servomotor (209), radial feed servomotor (212) respectively, main motor (205) connects main shaft (207) by main transmission chain (206), and the output that connects the rotary encoder (204) of main shaft (207) is connected with the input of interface (203); To moving slide board (211), connecting axle is connected with the input of interface (203) to the output of the position coder (208) of moving slide board (211) axial feed servomotor (209) by axial feed driving-chain (210) connecting axle; Radial feed servomotor (212) connects warp-wise feeding moving slide board (214) by radial feed driving-chain (213), the output that connects radial feed driving-chain (213) connects rotary encoder (215), and the output of rotary encoder (215) is connected with the input of interface (203).
Cutter of the present invention has the radial feed function when the main motion that is rotated cutting pipe lathe, its technological core is: the front end of machine tool chief axis is equipped with facing head, facing head and main shaft rotate synchronously, be provided with the slide plate that to realize the radial feed motion in the facing head, the radial feed servomotor drives Bevel Gear Transmission by power transmission shaft, after Bevel Gear Transmission makes motion change direction, the radially transmission ball-screw that drives in the facing head rotates, driving the radial feed slide plate moves, on the radial feed slide plate knife rest is housed, thereby when cutter rotates, realizes the radial feed motion of cutter.On the slide plate of lathe automatically centering fixture is installed, makes pipe step up its center line of back and lathe spindle dead in line.The pipe clamp slide plate is under the driving of axial feed servomotor during turning, and by the axial feed ball-screw, drive shaft case slide plate is done and is parallel to the mobile moving of machine tool chief axis direction.Thereby finish under the non-rotary condition of pipe, the turning of carrying out of tube end is processed.
Lathe headstock is fixedly mounted on can be vertically moving on the slide plate of moving on the lathe bed, and pipe clamp can realize that the self-centering of pipe steps up function.
The main motor that the outside of described lathe headstock is provided with by belt pulley transmission of power to the main transmission gear wheel, main transmission gear wheel and main shaft are connected and fixed by key.The feed servo motor is installed in the afterbody of main spindle box, and its axis is coaxial with main-shaft axis.Therefore, will drive the main shaft rotation of taking exercises when the main transmission gear wheel rotates, this moment, facing head also synchronously rotated with main shaft.The radial feed power transmission shaft is installed in the hollow space of main shaft by bearing, with main shaft be the sky nested structure, i.e. main shaft and radial feed power transmission shaft independent rotation separately.
The afterbody of machine tool chief axis rotates by synchronous cog belt mechanism driven rotary encoder, and rotary encoder rotates the rotation situation that in time detects main shaft, and gives digital control system this transfer of data.When main shaft rotated, if the radial feed servomotor does not rotate, the radial feed power transmission shaft can not rotate yet, but was mounted in can be rotated by dynamic bevel gear in the facing head, and radial feed screw can rotate, and can radially move just move radially slide plate.In the lathe that adopts frame for movement, address this problem by the frame for movement differential attachment, rotary encoder among the present invention in time detects the data that main shaft rotates, after digital control system reads these data, drive connection according to the feeding driving-chain, with the data that software sends basic rotary speed for the radial feed servomotor, the base speed of this radial feed servomotor moves radially slide plate when guaranteeing main axis rotation can not do radial motion in facing head.When moving radially slide plate and need radially move, digital control system sends the work feed speed data for the radial feed servomotor, by software the base speed data and the feed speed data of radial feed servomotor is synthesized operating rate.Realized that by above technology and software motion is synthetic, replaced the differential attachment of frame for movement.
The main spindle box slide plate can be finished the processing of common rib-loop under the control of digital control system, this is the basic fundamental that all Digit Control Machine Tools all possess, and the present invention repeats no more.The present invention makes cutter when main axis rotation, main shaft axially move, possesses the function that moves radially, thereby makes lathe possess the function of processing taper pipe thread, section, grooving.
Beneficial effect of the present invention: adopt the electronics driving-chain to replace mechanical drive train, realize radially synthesizing in the facing head.Thereby create a kind of simple and direct gas thread machining tool, large diameter gas thread has been realized the not cutting movement of rotor tool rotation of pipe, simplified clamping work, improved production efficiency.
Description of drawings:
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the synthetic control flow chart of motion of realizing the cutter radial feed motion.
Fig. 3 is a control flow chart of the present invention.
Fig. 4 is the synthetic computing block diagram of motion of realizing the cutter radial feed motion.
The specific embodiment:
Below principle of the present invention and feature are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Embodiment 1: see Fig. 1, a kind of numerical-control tube lathe, include lathe bed 18, end at lathe bed 18 is provided with main spindle box 4, be provided with pipe clamping device 14 at the other end, be provided with main motor 1 in the outside of lathe headstock 4, the output shaft of main motor 1 is by the output gear and 7 engagements of main transmission gear wheel of speed change gear, main transmission gear wheel 7 is connected with main shaft 6, and the end of main shaft 6 is fixed with facing head 9; Radial feed power transmission shaft 5 is located in the endoporus of main shaft 6, with main shaft 6 be same axis, its afterbody is provided with feed servo motor 2, the drive bevel gear of its end and bevel gear pair 10 is connected, the driven wheel of differential of bevel gear pair 10 is fixed on radial feed screw 20, and radial feed screw 20 is connected with facing head 9; Slide plate 11 be fixed on radial feed screw 10 nut engaged on, slide plate 11 is provided with radial tool post 12; Rotary encoder 19 is connected with main shaft 6 by synchronous cog belt mechanism 21.
Described pipe clamping device 14 is located on the anchor clamps slide plate 15 that can realize the self-centering function.
Embodiment 2: see Fig. 2, described numerical-control tube lathe, also include the motion composite control apparatus of radial feed motion, the motion composite control apparatus of described radial feed motion is that man-machine interface 101 is connected with digital control system 102, the interface of digital control system 102 connects main motor 103, radial feed motor 104 and axial feed motor 115, the output of main motor 103 connects motion combination mechanism 108 by connecting main transmission chain 105, and the output of radial feed motor 104 connects motion combination mechanism 108 by connecting feeding driving-chain 106; Axial feed motor 115 outputs connect main spindle box slide plate 112 and connect knife rest 111 by connecting axial feed driving-chain 114 connecting axles to feed screw 113; Rotary encoder 107 is connected the end of main transmission chain 105, and the value of angular displacement of main shaft is transferred to digital control system 102; The displacement of main spindle box slide plate 112 is given digital control system 102 by position sensor 117 with feedback information, and motion combination mechanism 108 connects knife rest 111 by bevel gear 109, radial feed screw 110.Position-detection sensor 116 detects the positional precision of knife rest 111 and is transferred to digital control system 102 under the state that lathe is shut down.
Embodiment 3: see Fig. 3, a kind of numerical-control tube lathe, include numerical control device, described numerical control device includes man-machine interface 201 and is connected with digital control system 202, the output connecting interface 203 of digital control system 202, the output of interface 203 connects main motor 205, axial feed servomotor 209, radial feed servomotor 212 respectively, and main motor 205 connects main shaft 207 by main transmission chain 206, and the output that connects the rotary encoder 204 of main shaft 207 is connected with the input of interface 203; To moving slide board 211, connecting axle is connected with the input of interface 203 to the output of the position coder 208 of moving slide board 211 axial feed servomotor 209 by axial feed driving-chain 210 connecting axles; Radial feed servomotor 212 connects warp-wise feeding moving slide board 214 by radial feed driving-chain 213, and the output that connects radial feed driving-chain 213 connects rotary encoder 215, and the output of rotary encoder 215 is connected with the input of interface 203.
During use, Fig. 4 is seen in the synthetic calculating of motion of the present invention, because the radial feed slide plate is under the situation of facing head rotation, does along the radial feed of facing head and moves.So rotation speed n of radial feed servomotor ActualBe made up of two parts, promptly the rotating speed with facing head keeps synchronous servomotor rotation speed n Substantially, with the facing head rotating speed be the servomotor rotation speed n that realizes radial feed under zero the situation Work
n Actual=n Substantially+ n Work
Wherein:
n Actual---the actual speed of feed servo motor;
n Substantially---during the facing head rotation, the rotating speed of radial feed servomotor when sliding carriage keeps not radially moving.n Substantially=n Main shaft
n Work---facing head rotates to be the rotating speed that zero situation lower skateboard is realized the radial feed servomotor of radial feed.
Figure BSA00000155506900071
(i in this example Feeding=1: 1, i.e. the gearratio of bevel gear pair)
Wherein: s---cutter radial amount of feeding mm/ main shaft revolution;
T---radial feed screw pitch mm;
i Feeding---the speed reducing ratio of radial feed driving-chain;
Application examples: the example of gas thread feeding
This example is that example is set forth machining screw feeding principle with processing sealed tube screw thread GB7306-87 type, and the tapering of this gas thread is 1: 16, and promptly gradient is 1: 32.
n Actual=n Substantially+ n Work
Wherein:
n Actual---the actual speed of feed servo motor;
n Substantially---during the facing head rotation, the rotating speed of radial feed servomotor when sliding carriage keeps not radially moving.n Substantially=n Main shaft=100 rev/mins (is example with the intermediate speed)
n Work---facing head rotates to be the rotating speed that zero situation lower skateboard is realized the radial feed servomotor of radial feed.
Wherein: s---cutter radial amount of feeding mm/ main shaft revolution;
T---radial feed screw pitch mm;
i Feeding---the speed reducing ratio of radial feed driving-chain.(i in this example Feeding=1: 1, i.e. the gearratio of bevel gear pair);
Look into " mechanical design handbook ", bore is that the pitch of the control screw thread of 6 inches (152.4mm) is 2.309, and per inch tooth number is 11.Therefore, by the definition of tapering and gradient as can be known:
1 32 = s 2.309
Can get: S=0.0721563
The helical pitch that t is ball-screw is 5mm;
So
n Actual=n Substantially+ n Work=100+1.443126=101.443126 rev/min
So knowing the real work rotating speed is 101.443126 rev/mins, the rotating speed that is to say the radial feed servomotor will remain on the radial feeds of 101.443126 rev/mins of cutters just can realize processing taper pipe thread accurately the time.
Do the technology that feed motion realizes screw thread processing as for cutter along the machine tool chief axis axis direction, all thread chasing machines all possess, and do not give unnecessary details in the present invention.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. numerical-control tube lathe, include lathe bed (18), end at lathe bed (18) is provided with main spindle box (4), be provided with pipe clamping device (14) at the other end, it is characterized in that including and be provided with main motor (1) in the outside of lathe headstock (4), the output shaft of main motor (1) is by the output gear and main transmission gear wheel (7) engagement of speed change gear, and main transmission gear wheel (7) is connected with main shaft (6), and the end of main shaft (6) is fixed with facing head (9); Radial feed power transmission shaft (5) is located in the endoporus of main shaft (6), with main shaft (6) be same axis, its afterbody is provided with feed servo motor (2), radial feed transmission the tip of the axis and drive bevel gear are connected and mesh with bevel gear pair (10): driven wheel of differential is fixed on radial feed screw (20), and radial feed screw (20) is connected with facing head (9); Slide plate (11) be fixed on radial feed screw (20) nut engaged on, slide plate (11) is provided with radial tool post (12); Rotary encoder (19) is by being connected with main shaft (6) by synchronous cog belt mechanism (21).
2. numerical-control tube lathe as claimed in claim 1, its feature include described pipe clamping device (14) and are located at and can realize on the self centering anchor clamps slide plate (15).
3. numerical-control tube lathe as claimed in claim 1, it is characterized in that also including the motion composite control apparatus of radial feed motion, the motion composite control apparatus of described radial feed motion is that man-machine interface (101) is connected with digital control system (102), the interface of digital control system (102) connects main motor (103), radial feed motor (104) and axial feed motor (115), the output of main motor (103) connects motion combination mechanism (108) by connecting main transmission chain (105), and the output of radial feed motor (104) connects motion combination mechanism (108) by connecting feeding driving-chain (106); Axial feed motor (115) output connects main spindle box slide plate (112) and connects knife rest (111) by connecting axial feed driving-chain (114) connecting axle to feed screw (113); Rotary encoder (107) is connected the end of main transmission chain (105), and the value of angular displacement of main shaft is transferred to digital control system (102); The displacement of main spindle box slide plate (112) is given digital control system (102) by position sensor (117) with feedback information, and motion combination mechanism (108) connects knife rest (111) by bevel gear (109), radial feed screw (110).Position-detection sensor (116) detects the positional precision of knife rest (111) and is transferred to digital control system (102) under the state that lathe is shut down.
4. numerical-control tube lathe as claimed in claim 1, its feature also includes numerical control device, described numerical control device includes man-machine interface (201) and is connected with digital control system (202), the output connecting interface (203) of digital control system (202), the output of interface (203) connects main motor (205) respectively, axial feed servomotor (209), radial feed servomotor (212), main motor (205) connects main shaft (207) by main transmission chain (206), and the output that connects the rotary encoder (204) of main shaft (207) is connected with the input of interface (203); To moving slide board (211), connecting axle is connected with the input of interface (203) to the output of the position coder (208) of moving slide board (211) axial feed servomotor (209) by axial feed driving-chain (210) connecting axle; Radial feed servomotor (212) connects warp-wise moving slide board (214) by radial feed driving-chain (213), the output that connects radial feed driving-chain (213) connects rotary encoder (215), and the output of rotary encoder (215) is connected with the input of interface (203).
CN2010101954767A 2010-06-08 2010-06-08 Numerical control pipe lathe Expired - Fee Related CN101870011B (en)

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Cited By (10)

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CN102218674A (en) * 2011-06-08 2011-10-19 烟台路辰世友数控机械有限公司 Precise numerical control rotary lathe
CN102873575A (en) * 2012-09-17 2013-01-16 扬州市组合机床厂 Numerical control coding boring composite power head of combined machine tool
CN104416167A (en) * 2013-09-06 2015-03-18 钰麟精密机械股份有限公司 Turning processing machine
CN104646689A (en) * 2015-02-06 2015-05-27 安阳工学院 Double-sided lathe special for valve
CN104668669A (en) * 2015-03-10 2015-06-03 柳州豪姆机械有限公司 Irrotational anchor thread machining device for over-length cable
CN104772530A (en) * 2015-04-17 2015-07-15 无锡市新湖冷拔校直机厂 Centerless machine tool
CN106984835A (en) * 2017-05-03 2017-07-28 繁昌县速诚智能设备科技有限公司 A kind of power unit of machine tool device
CN108602168A (en) * 2016-02-01 2018-09-28 星精密株式会社 Lathe
CN108941800A (en) * 2018-08-21 2018-12-07 佛山市名东科技有限公司 A kind of automatic thread machine
CN109365928A (en) * 2018-11-28 2019-02-22 重庆交通大学 Urban sewage pipeline thread milling device

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CN104646689A (en) * 2015-02-06 2015-05-27 安阳工学院 Double-sided lathe special for valve
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CN104772530B (en) * 2015-04-17 2017-04-19 无锡市新湖冷拔校直机厂 Centerless machine tool
CN104772530A (en) * 2015-04-17 2015-07-15 无锡市新湖冷拔校直机厂 Centerless machine tool
CN108602168A (en) * 2016-02-01 2018-09-28 星精密株式会社 Lathe
CN108602168B (en) * 2016-02-01 2020-08-28 星精密株式会社 Machine tool
CN106984835A (en) * 2017-05-03 2017-07-28 繁昌县速诚智能设备科技有限公司 A kind of power unit of machine tool device
CN106984835B (en) * 2017-05-03 2019-07-05 繁昌县速诚智能设备科技有限公司 A kind of power unit of machine tool device
CN108941800A (en) * 2018-08-21 2018-12-07 佛山市名东科技有限公司 A kind of automatic thread machine
CN109365928A (en) * 2018-11-28 2019-02-22 重庆交通大学 Urban sewage pipeline thread milling device
CN109365928B (en) * 2018-11-28 2020-04-28 重庆交通大学 Urban sewer pipeline thread milling equipment

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