CN101791771B - Thermal error differential screw compensating device and using method thereof - Google Patents
Thermal error differential screw compensating device and using method thereof Download PDFInfo
- Publication number
- CN101791771B CN101791771B CN 200910250884 CN200910250884A CN101791771B CN 101791771 B CN101791771 B CN 101791771B CN 200910250884 CN200910250884 CN 200910250884 CN 200910250884 A CN200910250884 A CN 200910250884A CN 101791771 B CN101791771 B CN 101791771B
- Authority
- CN
- China
- Prior art keywords
- sleeve
- worm
- screw
- bearing
- gear
- 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.)
- Active
Links
Images
Landscapes
- Automatic Control Of Machine Tools (AREA)
Abstract
The invention discloses a thermal error differential screw compensating device comprising a screw rod nut drive system, a worm gear compensating system, and a fastening nut (18), wherein the screw rod nut (2) is fixedly connected with a first sleeve (3) by six first attachment screws (17) which are evenly distributed on the circumstance; a right bearing (6) and a left bearing (7) are installed on the first sleeve (3) to bear radial load and unidirectional axial load; the left bearing (7) utilizes the shaft shoulder of the first sleeve (3) and a second sleeve (11) to realize axial positioning; the right bearing (6) utilizes a third sleeve (5) and the shaft shoulder to realize axial positioning; the third sleeve (5) is connected with a machine tool stand column by six third attachment screws (9) which are evenly distributed on the circumferential direction; the second sleeve (11) is installed on the first sleeve (3) and is connected with the third sleeve (5) by six second attachment screws (10); a worm gear (15) in the worm gear compensating system is connected with the first sleeve (3) by a flat key (16); a motor coupled-type reducer engine base (13) is connected with the stand column by four fourth attachment screws (12); a motor coupled-type reducer (19) is connected with a worm (14) by a coupler (20); the motor directly drives the worm (14) to drive the worm gear (15) to rotate; and the fastening nut (18) are sued for axially positioning the worm gear (15) through screw thread.
Description
Technical field
The invention belongs to Digit Control Machine Tool error compensation field, particularly a kind of differential screw compensating device of thermic error and using method thereof.
Background technology
Lathe is in running, temperature raises because process system is subjected to the influence of factors such as frictional heat, heat in metal cutting and environment temperature, produce distortion, thereby changed relative position original between the parts, destroy the correctness of its relative motion, cause size to change, make machine tool accuracy reduce battle array.The thermal deformation of lathe refers to that lathe in the course of the work owing to heatings such as friction, motions, causes the phenomenon of machine tool element dilatancy, is the main embodiment of process system thermal deformation.Studies show that in a large number the thermic error is the worst error source of Digit Control Machine Tool, accounts for 40%～70% of lathe overall error, it is most important to the machining accuracy that improves lathe therefore to reduce hot error.
Mainly contain three kinds of methods at present and can reduce the influence of thermal deformation; A kind of is temperature control, and a kind of is to improve machine tool structure, and another kind of method is heat error compensation.The control temperature mainly is the temperature of critical component on the control Digit Control Machine Tool lathe bed, thereby reaches the size of its thermal deformation of control.Main method is to arrange heating element heater or cooling system at the certain position of machine element, realizes the equilibrium in the temperature field of lathe integral body, reduces thermal deformation.Concrete enforcement comprises: the control cutting data reduces heat in metal cutting; Adopt air supporting, hydraulic pressure main shaft or the guide rail heat of reducing friction; The heat that adopts thermal insulation layer that the lathe heat generating components is produced is discharged; Adopt the oil cooling machine that main shaft is forced cooling; Adopt new materials such as pottery, magnetic bearing, thereby reduce caloric value.
Improve machine tool structure and refer to when Machine Tool design, reasonably select to produce the direction of thermal coefficient of expansion, control thermal deformation and the hot error of thermal deformation component materials, thereby the thermal deformation that effectively prevents vitals exerts an influence to the mismachining tolerance of lathe.Also proposed some in recent years and improved machine tool structure, the new method of control thermal deformation.As the people such as Ying Ji of the Zhejiang University characteristic according to phase-change material, propose phase-change material is injected in the parts of machine tool, can eliminate the thermal deformation of basic part within the specific limits.The researcher of Jilin Machinery ﹠ Electric Appliance Research ﹠ Design Inst. utilizes the auto-collimation principle to design novel slideway grinder, and this method can eliminate substantially because the thermal deformation of the basic part that variation of ambient temperature causes.The intercalation research environment variations in temperature such as brightness that account for of Jilin University are to the rule that influences of machine tool basic thermal deformation, think increase along with depth of foundation, basal temperature distributes and is the monochromatic wave that the negative exponent rule is successively decreased, thermal deformation mainly concentrates in the distance of the basic two ends of distance, and utilize the auto-collimation principle to propose double-deck foundation structure, make the lathe deadweight distortion thermal deformation that causes of compensate for ambient variations in temperature automatically, thus machining accuracy and the stability thereof of raising lathe.
But adopting said method is cost to sacrifice processing cost or process time mostly.As when the machine part precision is brought up to certain precision, its manufacturing cost is not along with the raising of precision increases by linearity, but increases exponentially.For the thermal deformation of lathe, though adopt certain method can reduce the generation of lathe frictional heat, can not eliminate the generation of lathe frictional heat fully, as main shaft bearing, the friction between axle and oil sealing etc.Reduce some parameter and can reduce cutting force, but may influence process time, increase the manufacturing cycle of workpiece.Therefore, said method be have necessarily circumscribed.
The another kind of method that reduces the thermal deformation influence is the heat error compensation technology, it is that the error that produces when adopting various detection means to digital control processing is carried out direct or indirect measurement, carrying out error compensation according to oneself error compensation model through setting up then calculates, result of calculation is fed back to digital control system, make controller send corresponding departure compensating instruction to compensate corresponding hot error, elimination thermal deformation influence, this method is to eliminate thermal deformation of machine tool, improve the main means of its machining accuracy, but most of digital control systems is open not enough, the error compensation value that calculates by error model can't be real-time be inserted in the numerical control program that has generated, namely can not realize real-time error compensation.In addition, most of digital control systems self do not have the Real-time Error compensate function, when therefore carrying out compensation task, and need be at concrete lathe specialized designs interface circuit.And now the present research major part of carrying out of institute is that a few examples are studied, at be some special purpose machine tools, the compensation control system robustness, the versatility that propose are relatively poor.
Summary of the invention
The objective of the invention is at the weak point in the existing heat error compensation technology, a kind of thermal error differential screw compensating device has been proposed, the Real-time Error compensation of lathe thermal-induced deformation in process be can directly realize at Digit Control Machine Tool, machine finish and product percent of pass effectively raised.
A kind of thermal error differential screw compensating device that the present invention proposes comprises feed screw nut transmission system, worm and gear bucking-out system and clamp nut 18.Ball-screw nut 2 is fixedly connected by uniform six first joint bolts 17 and first sleeve 3 on circumference, first right bearing 6 and first left bearing, 7 a pair of angular contact ball bearings are installed on first sleeve 3 to bear radial load and axial load, first left bearing 7 utilizes the shaft shoulder and second sleeve 11 on first sleeve 3 to realize axial location, first right bearing 6 utilizes the shaft shoulder on the 3rd sleeve 5 and first sleeve 3 to realize axial location, the 3rd sleeve 5 is connected with machine pillar by six the 3rd joint bolts 9 that are distributed on its circumferencial direction, second sleeve 11 is installed on first sleeve 3, and connect with the 3rd sleeve 5 by six second joint bolts 10, worm gear 15 in the worm and gear bucking-out system connects with first sleeve 3 by flat key 16, the support 13 of servomotor direct-connection type decelerator connects screw 12 by four tetrads and connects with machine pillar, servomotor direct-connection type decelerator 19 links by shaft coupling 20 and worm screw 14, motor direct-drive worm screw 14 drives worm gear 15 and rotates, clamp nut 18 is by being threaded for the axial location of worm gear 15 with first sleeve 3, and left packing ring 8 and right packing ring 4 are respectively applied to second sleeve 11 and first left bearing 7, connection place between the 3rd sleeve 5 and first right bearing 6 with prevent first left bearing 7 and first right bearing 6 from first sleeve 3 loose or dislocation and realize axially on the trace adjustment.
The using method of a kind of thermal error differential screw compensating device that the present invention proposes is: in the Digit Control Machine Tool processing parts process, when digital control system is sent instruction, when the motor-driven feed screw nut of digital control system control is realized the machine tool feed motion, the worm and gear bucking-out system is moved with the lathe column, and wherein worm and gear is in self-locking state; When indirect or direct detected thermal deformation of machine tool information is drawn the error amount that needs compensation by the thermal deformation error compensation model after, thereby the servomotor of bucking-out system control worm screw rotating band movable wire thick stick nut moves the promotion machine pillar and moves, thereby realize real-time heat error compensation, this moment, leading screw was in on-position.
After the present invention adopted above-mentioned thermal error differential screw compensating device and using method thereof, major advantage was:
1. above-mentioned heat error compensation device can be applied to polytype, the Digit Control Machine Tool of multiple model, and namely the versatility of this compensation arrangement is good.
2. above-mentioned heat error compensation device is to overlap independently bucking-out system, and antijamming capability is very strong, and robustness is better.
3. adopt the bucking-out system of worm and gear, stable drive in the compensation process, impact shock is little, and noise is low, and can realize the compensation of self-locking and micro-displacement.
4. after adopting above-mentioned compensation arrangement, when having utilized the ball-screw nut transmission during compensation rolling friction factor little, be active in one's movements, advantage such as high accuracy, motion are steady.
5. the offset that calculates through the thermal deformation errors model does not need to compensate by digital control system response interruption interpolation instruction, but independently realizes real-Time Compensation by external hardware and drive unit.
6. after adopting above-mentioned compensation arrangement and using method, bucking-out system is simple in structure, and cost is lower, and process is not had any influence, can not influence working (machining) efficiency.
Description of drawings
Fig. 1 is thermal error differential screw compensating device front view provided by the present invention.
Fig. 2 is thermal error differential screw compensating device left view provided by the present invention.
Among Fig. 1,1-leading screw, 2-feed screw nut, 3-first sleeve, the right packing ring of 4-, 5-the 3rd sleeve, 6-right bearing, 7-left bearing, 8-left side packing ring, 9-the 3rd joint bolt, 10-second joint bolt, 11-second sleeve, 12-tetrad connect screw, 13-motor direct-connection type decelerator support, 14-worm screw, 15-worm gear, 16-flat key, 17-first joint bolt, 18-clamp nut.
Among Fig. 2,19-motor direct-connection type decelerator, 20-shaft coupling, 21-left bearing, 22-right bearing.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, a kind of thermal error differential screw compensating device provided by the present invention comprises feed screw nut transmission system, worm and gear bucking-out system and clamp nut 18.In assembling process, earlier sleeve 5 utilizations six uniform screws 9 on its circumferencial direction are fixed in machine pillar, then with bearing 6,7, sleeve 3, feed screw nut 2, packing ring 4 penetrates sleeve 5 by schematic structure and compresses, sleeve 11 utilizes packing ring 8 to compress bearing 7 and utilizes six screws 10 to be connected in sleeve 5, motor direct-connection type decelerator support 13 is fixed in lathe by four screws 12, motor direct-connection type decelerator 19 links by shaft coupling 20 and worm screw 14, worm and gear is installed on the sleeve 3 by flat key 16, and clamp nut 18 and shaft shoulder place are used for the axial location of worm gear 15.
The operation principle of the thermal error differential screw collocation structure that the present invention proposes as shown in Figure 1, when digital control system is sent instruction, when the motor driven ball screws nut of digital control system control is realized the machine tool feed motion, the worm and gear bucking-out system is moved with the lathe column, and wherein worm and gear is in self-locking state; When indirect or direct detected thermal deformation of machine tool information is drawn the error amount that needs compensation by the thermal deformation error compensation model after, thereby the servomotor of bucking-out system control worm screw rotating band movable wire thick stick nut moves the promotion machine pillar and moves, realize real-time heat error compensation, this moment, leading screw was in on-position.
Compact conformation of the present invention, stable drive, efficient, the compensation precision height, can be widely used on the Digit Control Machine Tool, along with each part temperatures of lathe raises gradually, not influencing the lathe overall permanence and not changing on the basis of numerical control program, independently realize the real-Time Compensation to thermal deformation errors, significantly improve working (machining) efficiency and the product percent of pass of lathe, and can significantly improve the machining accuracy of part.
Claims (2)
1. thermal error differential screw compensating device, comprise the ball-screw nut transmission system, worm and gear bucking-out system and clamp nut (18), the ball-screw nut transmission system comprises leading screw (1), ball-screw nut (2), first sleeve (3), first joint bolt (17), first left bearing (7), first right bearing (6), left side packing ring (8), right packing ring (4), the 3rd sleeve (5), second sleeve (11), second joint bolt (10) and the 3rd joint bolt (9), the worm and gear bucking-out system comprises servomotor direct-connection type decelerator support (13), servomotor direct-connection type decelerator (19), shaft coupling (20), second left bearing (21), second right bearing (22), flat key (16), tetrad connects screw (12), worm gear (15) and worm screw (14), it is characterized in that ball-screw nut (2) is fixedly connected by six first joint bolts (17) uniform on its circumference and first sleeve (3), first right bearing (6), the a pair of angular contact ball bearing of first left bearing (7) is installed in first sleeve (3) and goes up to bear radial load and unidirectional axial load, first left bearing (7) utilizes the shaft shoulder and second sleeve (11) on first sleeve (3) to realize axial location, first right bearing (6) utilizes the shaft shoulder on the 3rd sleeve (5) and first sleeve (3) to realize axial location, the 3rd sleeve (5) is connected with machine pillar by six the 3rd joint bolts (9) that are distributed on its circumferencial direction, second sleeve (11) is installed on first sleeve (3), and connect with the 3rd sleeve (5) by six second joint bolts (10), worm gear in the worm and gear bucking-out system (15) connects with first sleeve (3) by flat key (16), the support (13) of servomotor direct-connection type decelerator connects screw (12) by four tetrads and connects with machine pillar, servomotor direct-connection type decelerator (19) links by shaft coupling (20) and worm screw (14), servomotor directly drives worm screw (14) and drives worm gear (15) rotation, clamp nut (18) is by being threaded for the axial location of worm gear (15), and left packing ring (8) and right packing ring (4) are respectively applied to second sleeve (11) and first left bearing (7), connection place between the 3rd sleeve (5) and first right bearing (6) is to prevent first left bearing (7) and first right bearing (6) from the last loose or dislocation of first sleeve (3) and the trace adjustment axially.
2. the using method of a kind of thermal error differential screw compensating device according to claim 1, it is characterized in that sending instruction when digital control system, when the motor-driven feed screw nut of digital control system control is realized the machine tool feed motion, the worm and gear bucking-out system is moved with the lathe column, and wherein worm and gear is in self-locking state; When indirect or direct detected thermal deformation of machine tool information is drawn the error amount that needs compensation by the thermal deformation error compensation model after, thereby the servomotor of bucking-out system control worm screw rotating band movable wire thick stick nut moves the promotion machine pillar and moves, realize real-time heat error compensation, this moment, leading screw was in on-position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910250884 CN101791771B (en) | 2009-12-31 | 2009-12-31 | Thermal error differential screw compensating device and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910250884 CN101791771B (en) | 2009-12-31 | 2009-12-31 | Thermal error differential screw compensating device and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101791771A CN101791771A (en) | 2010-08-04 |
| CN101791771B true CN101791771B (en) | 2013-08-07 |
Family
ID=42584802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910250884 Active CN101791771B (en) | 2009-12-31 | 2009-12-31 | Thermal error differential screw compensating device and using method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101791771B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699767B (en) * | 2012-05-28 | 2014-07-16 | 上海三一精机有限公司 | Thermal deformation automatic compensation mechanism for screw rod and machine tool |
| CN106975959B (en) * | 2017-04-25 | 2023-07-25 | 沈机集团昆明机床股份有限公司 | Rotary shaft feeding device with thermal elongation compensation structure |
| CN113967816B (en) * | 2021-11-29 | 2024-07-23 | 重庆忽米网络科技有限公司 | Self-adaptive thermal deformation compensation system for welding fixture |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099938C (en) * | 1996-11-07 | 2003-01-29 | 大隈株式会社 | Error correction appts. for NC machine tool |
| CN1258431C (en) * | 2004-03-31 | 2006-06-07 | 清华大学 | Method for compensating error of numeric-contrlled machine and system |
| CN101015900A (en) * | 2007-02-27 | 2007-08-15 | 江苏恒力组合机床有限公司 | Ram extending droop subsection deformation compensating unit |
-
2009
- 2009-12-31 CN CN 200910250884 patent/CN101791771B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099938C (en) * | 1996-11-07 | 2003-01-29 | 大隈株式会社 | Error correction appts. for NC machine tool |
| CN1258431C (en) * | 2004-03-31 | 2006-06-07 | 清华大学 | Method for compensating error of numeric-contrlled machine and system |
| CN101015900A (en) * | 2007-02-27 | 2007-08-15 | 江苏恒力组合机床有限公司 | Ram extending droop subsection deformation compensating unit |
Non-Patent Citations (2)
| Title |
|---|
| 应济等.《重型机床的热变形控制研究》.《机械科学与技术》.1998,第17卷(第4期),623-625. * |
| 闫占辉等.《新型自准直导轨磨床床身—基础系统的热态特性分析》.《中国机械工程》.2004,第15卷(第3期),199-201. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101791771A (en) | 2010-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202877995U (en) | Double nut driven type ball screw assembly feeding mechanism | |
| CN104227503A (en) | Real-time online detection and compensation device for thermal elongation deformation error of boring spindles of numerical control machine tool | |
| CN101791771B (en) | Thermal error differential screw compensating device and using method thereof | |
| CN103495905A (en) | Real-time online detection and closed loop feedback compensation device of ram thermal expansion deformation errors of numerically-controlled machine tool and detection method thereof | |
| CN102166720A (en) | Structural support of ball screw assembly | |
| CN101947747A (en) | Machine-tool error compensation device and numerically-controlled machine tool comprising same | |
| CN103808508A (en) | Double-layer double-screw type lifetime contrasting testbed of ball screw assembly | |
| CN104759929A (en) | Large precise heavy-load intelligent adjusting rotating table | |
| CN202517371U (en) | Indexing and positioning device of high-precision worm wheel worm rod pair | |
| CN203650135U (en) | Real-time online detection and closed loop feedback compensation device for thermal elongation strain errors of numerical control machine tool ram | |
| CN200975457Y (en) | High speed accurate ball guide-screw pair | |
| CN103978399A (en) | Four-coordinate automatic loading-unloading robot | |
| CN104646718B (en) | Micro-feeding device for hydraulic boring tool and boring lathe with micro-feeding device | |
| CN207387229U (en) | A kind of numerical control machining tool heat error control structure | |
| CN105598732A (en) | Electric linear feeding unit and assembling method thereof | |
| CN102886709B (en) | Hydraulic gasket type device for adjusting constant rigidity of ball screw | |
| CN110434653A (en) | Improved servo Show knife head | |
| CN201399700Y (en) | Thermal resistor type thermal elongation compensation device for main shaft | |
| CN201136105Y (en) | Exactly positioning apparatus for feed of ram | |
| CN109622997A (en) | A kind of perseverance axle center independence spindle box | |
| CN204818975U (en) | Digit control machine tool that positioning accuracy is high | |
| CN204524978U (en) | A kind of precise heavy-load Intelligent adjustment huge revolving table | |
| CN201077006Y (en) | Servo auto-tracing supporting device for crankshaft abrading | |
| CN202964258U (en) | Hydraulic gasket type rigidity constant regulation device for ball screw | |
| CN102632443B (en) | A kind of three axle aspheric surface grinding machines |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |