CN102962746B - Roller way grinding and positioning device for ball screw nut - Google Patents
Roller way grinding and positioning device for ball screw nut Download PDFInfo
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- CN102962746B CN102962746B CN201210464235.7A CN201210464235A CN102962746B CN 102962746 B CN102962746 B CN 102962746B CN 201210464235 A CN201210464235 A CN 201210464235A CN 102962746 B CN102962746 B CN 102962746B
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- screw nut
- ball
- video camera
- nut
- grinding
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Abstract
The invention discloses a roller way grinding and positioning device for a ball screw nut. The roller way grinding and positioning device comprises a CCD (Charge Coupled Device) camera (4), a grating reading head (14) and a singlechip microcomputer (17), wherein the singlechip microcomputer (17) is used for computing the relative position of a reverser hole in the axial direction according to an image shot by using the CCD camera (4), computing the position of the spiral line of the nut, and computing the axial position of an end face which is closest to the inner hole of a the ball screw nut (3) into which a grinding wheel (6) enters by using the computed position of the spiral line of the nut and the circumferential phase situation of a grinding point during grinding of the ball screw nut (3) through the grinding wheel; and other adjusted cutter point positions of the grinding wheel (6) can be obtained by increasing/decreasing a lead. Due to the adoption of the scheme, high-accuracy tool setting is easy to realize, and meanwhile, the yield is increased simultaneously.
Description
Technical field
The present invention relates to mechanical manufacturing field, especially in ball screw nut roller path grinding technique engineering, in particular a kind of ball screw nut roller path grinding location device.
Background technology
In ball-screw nut, raceway utilizes CNC grinder for internal thread to process.2 to 6 reverser holes are evenly offered with radial direction vertically in the inside and outside face of cylinder of ball-screw nut, reverser hole or be waist hole, or be circular hole.According to the requirement of ball-screw nut processing technology, must first process reverser hole, then complete interior ball race grinding.Because nut inner thread raceway must keep fixing geometrical relationship with the center in all reverser holes, and according to screw thread process principle, in nut raceway add man-hour emery wheel translational speed and nut rotating speed ratio to be processed fix.In the nut machined, raceway must should ensure helix required precision, and fix with all reverser holes axial dimension on the nut face of cylinder again, in processing, tool setting is very difficult.This problem becomes the main bugbear that restriction ball-screw nut machining accuracy improves.Prior art relies on workman's experience, adopts " sparking method " to carry out tool setting, be easy to produce waste product, and tool setting precision is not higher than 0.3 to 0.5mm.
Summary of the invention
Technical problem to be solved by this invention provides a kind of ball screw nut roller path grinding location device for the deficiencies in the prior art
, obtain the tool setting device of emery wheel tool setting.
Technical scheme of the present invention is as follows:
A kind of ball screw nut roller path grinding location device, comprises ccd video camera (4), grating reading head (14), single-chip microcomputer (17); Making ball-screw nut (3) to be processed turn to its each reverser hole respectively can just to the position of ccd video camera (4), ccd video camera (4) moves to can just take on the position in reverser hole along ball-screw nut (3) axis direction, every position, single-chip microcomputer (17) utilizes grating reading head (14) to read the position of current C CD video camera (4), and single-chip microcomputer (17) calculates reverser axially bored line direction relative position according to the image that ccd video camera (4) is taken; Single-chip microcomputer (17) also calculates the position of nut screw line; Grinding points circumferential phase situation when single-chip microcomputer (17) utilizes the nut screw line position and wheel grinding ball-screw nut (3) that calculate, calculate the axial location that distance emery wheel (6) enters the nearest end face of ball-screw nut (3) endoporus, other tool setting point position of emery wheel (6) can be obtained by plus-minus helical pitch.
Described ball screw nut roller path grinding location device, described ccd video camera is arranged on video camera mounting plate (7), video camera mounting plate (7) is fixed by screws on dovetail slide block (8), dovetail slide block (8), under the rotation of handwheel (19) regulates, does the rectilinear motion being parallel to ball-screw nut (3) axis relative to dovetail guide (9).
Described ball screw nut roller path grinding location device, the side of described dovetail slide block (8) is provided with determines grating (13), described grating reading head (14) is arranged on by grating installing plate (15) and determines on the dovetail guide (9) of grating (13) homonymy, and grating reading head (14) is connected with the single-chip microcomputer (17) be arranged on rear rail plate (12) by holding wire; The side being beneficial to observation in device frame (11) is provided with display operating panel (16), is used for showing and setting described single-chip microcomputer (17).
Described ball screw nut roller path grinding location device, described ball-screw nut to be processed (3) is clamped on scroll chuck (1), rubber ring (2) is cementing to be anchored on scroll chuck (1), the ball-screw nut (3) to be processed that rubber ring (2) grasps with scroll chuck (1) and its rotates, rotary motion passes to and the rubber tire of its close contact (24) by rubber ring (2), rubber tire (24) is arranged on support (23), support (23) adjusts along the axis direction of ball-screw nut (3) to be processed, support (23) is arranged on adjustable plate (20).
Described ball screw nut roller path grinding location device, described adjustable plate (20) is directly placed on rear rail plate (12), rubber wheel (24) and the contact force being arranged on the rubber ring (2) on scroll chuck (1) is increased by tightening adjustment screw (21), when ensureing that rubber ring (2) rotates with scroll chuck (1), rubber wheel (24) can with rubber ring (2) synchronous axial system, and without relative sliding.
Described ball screw nut roller path grinding location device, the angular displacement of described rubber wheel (24) rotary motion is sensed by the rotary encoder (22) connected with it, and ccd video camera (4) utilizes the annular light source (5) be placed on before its camera lens to realize the illumination of each reverser hole site on ball-screw nut 3 face of cylinder to be processed.
Adopt such scheme, easily realize high-precision aim at tool operation, improve yield rate simultaneously.
Accompanying drawing explanation
Fig. 1 is ball screw nut roller path grinding location device structural representation;
Fig. 2 is Coordinate Conversion schematic diagram in the present invention;
Fig. 3 is helix the Fitting Calculation figure in the present invention;
Fig. 4 is phasometer nomogram in the present invention;
1 scroll chuck, 2 rubber rings, 3 ball-screw nuts, 4CCD video camera, 5 annular light sources, 6 emery wheels, 7 video camera mounting plates, 8 dovetail slide blocks, 9 dovetail guides, 10 fromer rail plates, 11 frames, 12 rear rail plates, 13 determine grating, 14 grating reading heads, 15 grating installing plates, 16 display operating panels, 17 single-chip microcomputers, 18 lock-screws, 19 handwheels, 20 adjustable plates, 21 adjustment screw, 22 rotary encoders, 23 supports, 24 rubber wheels; 25 grinder wheel frame guide rails.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
With reference to figure 1, ball screw nut roller path grinding location device comprises rubber ring (2), ccd video camera (4), annular light source (5), video camera mounting plate (7), dovetail slide block (8), dovetail guide (9), fromer rail plate (10), frame (11), rear rail plate (12), determine grating (13), grating reading head (14), grating installing plate (15), display operating panel (16), single-chip microcomputer (17), lock-screw (18), handwheel (19), adjustable plate (20), adjustment screw (21), encoder (22), support (23), rubber wheel (24),
Rubber ring 2 is cementing to be anchored on scroll chuck 1, rubber ring 2 can rotate with scroll chuck 1 and its ball-screw nut 3 to be processed grasped, rotary motion is passed to the rubber tire 24 with its close contact by rubber ring 2, rubber tire 24 is arranged on support 23, support 23 can adjust along the axis direction of ball-screw nut 3 to be processed, support 23 is arranged on adjustable plate 20, adjustable plate 20 is directly placed on rear rail plate 12, rubber wheel 24 and the contact force being arranged on the rubber ring 2 on scroll chuck 1 can be increased by tightening adjustment screw 21, when ensureing that rubber ring 2 rotates with scroll chuck 1, rubber wheel 24 can with rubber ring 2 synchronous axial system, and without relative sliding.
The angular displacement of rubber wheel 24 rotary motion is sensed by the rotary encoder 22 connected with it, ccd video camera 4 is for taking each reverser hole site on ball-screw nut 3 face of cylinder to be processed, the annular light source 5 be placed on before its camera lens is utilized to realize the illumination of each reverser hole site on ball-screw nut 3 face of cylinder to be processed, ccd video camera is arranged on video camera mounting plate 7, video camera mounting plate 7 is fixed by screws on dovetail slide block 8, dovetail slide block 8 can under the rotation of handwheel 19 regulates, the rectilinear motion being parallel to ball-screw nut 3 axis is done relative to dovetail guide 9.The side of dovetail slide block 8 is provided with determines grating 13, and grating reading head 14 is arranged on by grating installing plate 15 and determines on the dovetail guide 9 of grating 13 homonymy, and grating reading head 14 is connected with the single-chip microcomputer 17 be arranged on rear rail plate 12 by holding wire.The side being beneficial to observation in device frame 11 is provided with display operating panel 16, is used for showing and setting single-chip microcomputer 17.The fromer rail plate 10 that whole frame 11 is connected by pin and rear rail plate 12 are arranged on grinder wheel frame guide rail 25, after setting position is adjusted, are also locked by lock-screw 18 implement device and machine tool guideway.
When not changing machine body, utilize rubber ring 2, rubber tire 24 and rotary encoder 22 to obtain the angular motion displacement of nut to be processed, calculate helix extended line position according to the relative position in reverser hole in this angular displacement and ccd video camera 4 shot image.Grating measuring device (comprise grating reading head 14, determine grating 15, dovetail slide block 8, dovetail guide 9 and handwheel 19) obtains the relative position relation of ccd video camera 4 when taking each reverser hole of nut and shooting emery wheel.
When ball-screw nut 3 to be processed is clamped to after on scroll chuck 1, hand rotation scroll chuck 1, make its each reverser hole turning to ball-screw nut 3 respectively can just to the position of ccd video camera 4, period ccd video camera 4 can move to can just take on the position in reverser hole along ball-screw nut 3 axis direction under the adjustment of handwheel 19.Every position, single-chip microcomputer 17 utilizes grating reading head 14 to read current C CD camera position, and calculates reverser axially bored line direction relative position according to the image of shooting; Single-chip microcomputer 17 also utilizes rubber ring 2, rubber tire 24 and rotary encoder 23 to sense the relative angular displacement in each reverser hole simultaneously, then according to nut thread helical pitch, calculates the position of nut screw line.Grinding points circumferential phase situation when single-chip microcomputer 17 utilizes the nut screw line position and wheel grinding ball-screw nut 3 that calculate, calculate the axial location that distance emery wheel 6 enters the nearest end face of ball-screw nut 3 endoporus, other tool setting point position of emery wheel 6 can be obtained by plus-minus helical pitch.
The starting coordinate position of emery wheel 6 tool setting can be determined when first use, defining method starts at lathe, but under the state of scroll chuck 1 and emery wheel 6 stall (namely system starts), the set-up function button on display operating panel 16 is utilized to select the design helical pitch of nut to be processed, mobile emery wheel 6 to ccd video camera 4 dead ahead, with the profile of the shoot function button shooting emery wheel 6 on display operating panel 16, single-chip microcomputer 17 is according to grating reading head 14 and grinding wheel profile image, calculate the position of emery wheel 6, emery wheel 6 is moved on the position of helix extended line to utilize lathe adjusting device.
With reference to figure 2, measuring system comprises two coordinate systems, namely lathe coordinate system and
locationdevice coordinate system, machine coordinates is that numerically control grinder institute is intrinsic, and mainly contain direction of feed X and main-shaft axis direction Z-direction, the two directly can be obtained by machine tool digital display unit;
locationdevice coordinate system mainly contains the angular displacement direction Φ of main-shaft axis rectilinear direction Z ' and main shaft, and the two is obtained by grating measuring device and encoder 22 respectively; In fig. 2, I, II are the bar shaped bead returning groove on ball-screw nut 3 to be processed, and SP is the helix on the large path position of nut rolling way.According to ball-screw nut processing technology, ball-screw nut 3 has completed the processing of bar shaped bead returning groove I, II before carrying out the processing of internal thread raceway, and nut thread raceway adds should make processed nut rolling way man-hour just through the center of the two ends semicircle of all bead returning grooves.Because helical pitch is fixed, in process, the emery wheel 6 of internal thread grinding machine moves along Z-direction and the rotary motion speed ratio relation of nut 3 is fixing, the extended line therefore only needing emery wheel to be parked in nut screw line before processing can realize the accurate machining of screw thread raceway.The X-coordinate that emery wheel institute off-position is put accurately realizes by trial cut, and its Z-direction location needs point two each and every one steps.
The first step be find lathe coordinate system with
locationboth device coordinate systems are in the correlation of Z-direction.Pass through
locationdevice shooting emery wheel profile obtains emery wheel and exists
locationz axis coordinate Z in device coordinate system
m, the namely starting coordinate position of emery wheel, then manually inputs the now Z axis coordinate Z of emery wheel in lathe coordinate system
0, the two position relationship, i.e. Δ Z=Z can be calculated
0-Z
m.
Second step obtains emery wheel to exist
locationserial coordinate points Z in device coordinate system
m, namely emery wheel exists
locationdesirable tool setting point in device coordinate system.If establish numerical control ball-bearing lead-screw milling tool coordinate to be XOZ,
locationthe system coordinates of device is
locationdevice obtains each bar hole two ends center of arc A in accompanying drawing 2 by ccd sensor shooting bar hole
1, B
1, A
2, B
2...
z
dcoordinate, is used for obtaining the relative coordinate of different camera site by encoder in Fig. 1 22 and grating reading head 13
zX,
acquisition can directly be obtained by encoder 22, and Z
xthen need to be calculated by the camera site of the relative position on the axial direction of reverser hole and CCD camera.Thus obtain each cylindrical void two ends circular arc centre coordinate Φ
d+ Φ
x, Z
d+ Z
x, press least square fitting according to these and go out helix equation Z=a Φ+b, in formula, a, b are fit equation coefficient, see Fig. 3.Work as B
4point phase place when circumferentially phase place is identical, can obtain serial emery wheel location point Z with wheel grinding point phase place
m=Z
b4+ Δ
m, Z in formula
b4=a Φ
b4+ b; Δ
m=NL
0, L
0for lead, N is positive integer.Work as B
4when point phase place and wheel grinding point phase place exist phase difference, emery wheel location point is
in formula, L0 is nut helical pitch, and Δ θ is B
4point phase place and wheel grinding point are at same phase difference circumferentially.Because wheel grinding point is all the time in the horizontal plane of nut axis, and be positioned at ccd video camera shooting side, namely in Fig. 4 on z-z line, then can by shooting B
4the geometrical relationship of dot image, calculates phase difference
this work is completed by single-chip microcomputer 17.For avoiding too much image procossing and calculating,
locationtime can as far as possible by B
4point is aligned on the center line of nut.
According to above two steps, single-chip microcomputer 17 can complete emery wheel tool setting point Z coordinate in lathe coordinate system and calculate, i.e. Z
s=Z
m+ Δ Z, thereafter, single-chip microcomputer is by Z
sbe sent to display operating panel 15 to show, operating personnel complete the location of emery wheel according to the show value of operation display panel 15.Due to Z
scalculate emery wheel tool setting location point for current nut strip hole site to be processed, as long as such location point is the integral multiple of nut thread raceway helical pitch, can correctly tool setting, therefore operator can select closest approach to realize tool setting according to current emery wheel position.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (6)
1. a ball screw nut roller path grinding location device, is characterized in that, comprises ccd video camera (4), grating reading head (14), single-chip microcomputer (17); Making ball-screw nut (3) to be processed turn to its each reverser hole respectively can just to the position of ccd video camera (4), ccd video camera (4) moves to can just take on the position in reverser hole along ball-screw nut (3) axis direction, every position, single-chip microcomputer (17) utilizes grating reading head (14) to read the position of current C CD video camera (4), and single-chip microcomputer (17) calculates reverser axially bored line direction relative position according to the image that ccd video camera (4) is taken; Single-chip microcomputer (17) also calculates the position of nut screw line; Grinding points circumferential phase situation when single-chip microcomputer (17) utilizes the nut screw line position and wheel grinding ball-screw nut (3) that calculate, calculate the axial location that distance emery wheel (6) enters the nearest end face of ball-screw nut (3) endoporus, other tool setting point position of emery wheel (6) can be obtained by plus-minus helical pitch.
2. ball screw nut roller path grinding location device according to claim 1, it is characterized in that, described ccd video camera is arranged on video camera mounting plate (7), video camera mounting plate (7) is fixed by screws on dovetail slide block (8), dovetail slide block (8), under the rotation of handwheel (19) regulates, does the rectilinear motion being parallel to ball-screw nut (3) axis relative to dovetail guide (9).
3. ball screw nut roller path grinding location device according to claim 2, it is characterized in that, the side of described dovetail slide block (8) is provided with determines grating (13), described grating reading head (14) is arranged on by grating installing plate (15) and determines on the dovetail guide (9) of grating (13) homonymy, and grating reading head (14) is connected with the single-chip microcomputer (17) be arranged on rear rail plate (12) by holding wire; The side being beneficial to observation in device frame (11) is provided with display operating panel (16), is used for showing and setting described single-chip microcomputer (17).
4. ball screw nut roller path grinding location device according to claim 1, it is characterized in that, described ball-screw nut to be processed (3) is clamped on scroll chuck (1), rubber ring (2) is cementing to be anchored on scroll chuck (1), the ball-screw nut (3) to be processed that rubber ring (2) grasps with scroll chuck (1) and its rotates, rotary motion passes to and the rubber tire of its close contact (24) by rubber ring (2), rubber tire (24) is arranged on support (23), support (23) adjusts along the axis direction of ball-screw nut (3) to be processed, support (23) is arranged on adjustable plate (20).
5. ball screw nut roller path grinding location device according to claim 4, it is characterized in that, described adjustable plate (20) is directly placed on rear rail plate (12), rubber wheel (24) and the contact force being arranged on the rubber ring (2) on scroll chuck (1) is increased by tightening adjustment screw (21), when ensureing that rubber ring (2) rotates with scroll chuck (1), rubber wheel (24) can with rubber ring (2) synchronous axial system, and without relative sliding.
6. ball screw nut roller path grinding location device according to claim 5, it is characterized in that, the angular displacement of described rubber wheel (24) rotary motion is sensed by the rotary encoder (22) connected with it, and ccd video camera (4) utilizes the annular light source (5) be placed on before its camera lens to realize the illumination of each reverser hole site on ball-screw nut to be processed (3) face of cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210464235.7A CN102962746B (en) | 2012-11-07 | 2012-11-07 | Roller way grinding and positioning device for ball screw nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210464235.7A CN102962746B (en) | 2012-11-07 | 2012-11-07 | Roller way grinding and positioning device for ball screw nut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102962746A CN102962746A (en) | 2013-03-13 |
| CN102962746B true CN102962746B (en) | 2015-03-11 |
Family
ID=47793335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210464235.7A Expired - Fee Related CN102962746B (en) | 2012-11-07 | 2012-11-07 | Roller way grinding and positioning device for ball screw nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102962746B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104259933A (en) * | 2014-09-05 | 2015-01-07 | 大连高金数控集团有限公司 | Ball nut phase measuring device and corresponding nut return device hole machining method |
| CN108500755B (en) * | 2018-06-11 | 2024-08-23 | 济宁市微科特机械制造有限责任公司 | Tool and method for machining nut of ball screw |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2935211B2 (en) * | 1994-04-15 | 1999-08-16 | ユニオンツール株式会社 | Spiral groove measuring device |
| JP2001012903A (en) * | 1999-07-02 | 2001-01-19 | Okuma Corp | Position-detecting-device |
| JP5351552B2 (en) * | 2009-02-20 | 2013-11-27 | 富士機械製造株式会社 | Measuring device and measuring method thereof, machining position correcting device of cutting machine, and machining position correcting method thereof |
| CN201740514U (en) * | 2010-06-21 | 2011-02-09 | 邓丹 | Device for measuring distance between two points |
| CN202209936U (en) * | 2011-09-28 | 2012-05-02 | 重庆理工大学 | Contact type off-machine tool setting measuring device |
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2012
- 2012-11-07 CN CN201210464235.7A patent/CN102962746B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN102962746A (en) | 2013-03-13 |
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