CN106225653A - A kind of device detecting boring head main shaft and verticality of stand column - Google Patents

A kind of device detecting boring head main shaft and verticality of stand column Download PDF

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Publication number
CN106225653A
CN106225653A CN201610789793.9A CN201610789793A CN106225653A CN 106225653 A CN106225653 A CN 106225653A CN 201610789793 A CN201610789793 A CN 201610789793A CN 106225653 A CN106225653 A CN 106225653A
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China
Prior art keywords
cantilever
plate
verticality
main shaft
dove
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Granted
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CN201610789793.9A
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Chinese (zh)
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CN106225653B (en
Inventor
张军
吴将军
张永桥
蒋林涛
董本乾
文声振
郑志强
汪吉峰
张威
罗浩源
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Hubei Sanhuan Complete Industrial Co Ltd
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Hubei Sanhuan Complete Industrial Co Ltd
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Priority to CN201610789793.9A priority Critical patent/CN106225653B/en
Publication of CN106225653A publication Critical patent/CN106225653A/en
Application granted granted Critical
Publication of CN106225653B publication Critical patent/CN106225653B/en
Expired - Fee Related legal-status Critical Current
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/24Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B5/245Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing perpendicularity

Abstract

A kind of device detecting boring head main shaft and verticality of stand column, including cantilever, amesdial and datum plate, the sidewall plane of described cantilever one end is fitted or parallel completely with the end face of spindle hole, and the other end of described cantilever is free end, and described amesdial is fixedly connected on the free end of cantilever;Described datum plate is orthogonal wing plate and the T-type structure of base plate composition, the length of an at least wing of described datum plate is less than the height of projection of dove-tail form guide rail, during use, the base plate of described datum plate is close to the upper surface of dove-tail form guide rail, the intersection of base plate plane and wing plate plane overlaps with the crest line of dove-tail form guide rail, and the probe of described amesdial is on the plane of reference of the wing plate of datum plate.The present invention overcomes defect of the prior art, reduces the labor intensity of workman, shortens in the time of machine overhaul, improves work efficiency.

Description

A kind of device detecting boring head main shaft and verticality of stand column
Technical field
The invention belongs to field of mechanical technique, relate to a kind of testing apparatus for verticality, especially one and be used for detecting boring machine Headstock spindle and the device of verticality of stand column.
Background technology
In field of machining, machining tool price is the highest, and after life-time service, a lot of moving components of machining tool are just Can wear and tear, cause machining accuracy more and more lower, in order to improve the precision of machining tool processing, reduce lathe and newly purchase cost, typically Machining tool can be carried out large repairs.
When the overhaul of boring machine, the most critically important one needs boring head is disassembled maintenance exactly.Maintenance After complete, in addition it is also necessary to verification boring head main shaft and the perpendicularity of boring machine column, to ensure that main spindle box is parallel with boring table Degree.Lack a kind of simplicity at present can directly detect the instrument that headstock spindle is the most vertical with column.Main spindle box weight is very Greatly, dismount each time the most very inconvenient.If the perpendicularity of main spindle box and column can not be checked again, just can only be by all parts All install and check main spindle box the most vertical the most again.If it is not, just can only again dismount once, workman's workload be very Greatly.
The plane of the dove-tail form guide rail of boring machine column is parallel with main-shaft axis, and boring machine column itself is except dove-tail form guide rail Outward, other plane is all casting plane, and surface smoothness is poor, it is impossible to be used for doing the datum level detected.At conventional detection instrument With in detection method, whether main-shaft axis to be detected is and plane-parallel, it is necessary to have a datum level being perpendicular to main-shaft axis As the plane of reference.
Summary of the invention
The technical problem to be solved is, it is provided that a kind of main spindle box and verticality of stand column detection device, permissible Overcome defect of the prior art, reduce the labor intensity of workman, shorten in the time of machine overhaul, improve work efficiency.
As follows in order to solve above-mentioned technical problem technical scheme:
A kind of device detecting boring head main shaft and verticality of stand column, described boring machine includes column, main spindle box and master Axle box main shaft, described column is provided with dove-tail form guide rail, and described main spindle box is provided with spindle hole, described detection boring head master The device of axle and verticality of stand column includes cantilever, amesdial and datum plate, the sidewall plane of described cantilever one end and spindle hole End face laminating or parallel, the other end of described cantilever is free end, and described amesdial is fixedly connected on the free end of cantilever;
Described datum plate is orthogonal wing plate and the T-type structure of base plate composition, an at least wing of described datum plate Length less than the height of projection of dove-tail form guide rail, the base plate of described datum plate is close to the upper surface of dove-tail form guide rail, described base The base plate plane of quasi-plate and the intersection of wing plate plane overlap with the crest line of dove-tail form guide rail, and the probe of described amesdial is against benchmark On the wing plate of plate.
As an embodiment of the invention, described cantilever passes through to support with the laminating of spindle hole end face or parallel one end Device is fixed on spindle hole, and cantilever can rotate in the end face of spindle hole or the plane parallel with end face.
As an embodiment of the invention, described support means includes that support bar, cushion block, fixing bearing and cantilever prop up Support bearing, described support bar runs through spindle hole, and one end of described support bar sequentially passes through from the inside to the outside and is adjacent on spindle hole Fixing bearing and cushion block, described cushion block and fixing bearing are fixed by the nut screwed on support bar, described support bar another It is logical that one end sequentially passes through cantilever support bearing and cantilever, described cantilever and the cantilever support bearing being adjacent at spindle hole from the inside to the outside The nut that overwinding is combined on support bar is fixed, and described cantilever can rotate in the medial plane of cantilever support bearing.
Preferably, described datum plate has magnetic, and described datum plate is fixed on dove-tail form guide rail by magnetic-adsorption.
Preferably, described cantilever has magnetic, and described cantilever is fixed on the end face of spindle hole by magnetic-adsorption.
Preferably, the cross section of described cantilever is T-shape.
Preferably, described cantilever is aluminum alloy material.
The technical scheme that the present invention provides has the benefit that
1. the detection boring head main shaft and the device of verticality of stand column of the present invention, the base plate of datum plate is close to dove-tail form The upper surface of guide rail, the intersection of base plate plane and wing plate plane overlaps with the crest line of dove-tail form guide rail, with flat on dove-tail form guide rail On the basis of face and crest line, convert and createed the plane of reference that can be used to make detect vertical with boring head main shaft, On the basis of this, on datum plate, play table by the amesdial on cantilever, thus carry out main spindle box and verticality of stand column detection, solve The problem that prior art can not detect headstock spindle and verticality of stand column.
2. the detection boring head main shaft and the device of verticality of stand column of the present invention, it is provided that a kind of support means, supports The support bar of device passes spindle hole, and cantilever can rotate around support bar, cantilever mounted in this way, can reduce every time The measurement error that the small variations that cantilever is fitted with spindle hole end face brings, test result is more accurate.
3. the detection boring head main shaft and the device of verticality of stand column, the end face of headstock spindle and cantilever of the present invention Between be provided with cantilever support bearing, prevent cantilever from destroying spindle hole end face with the end face direct friction of main shaft in rotation process.
4. the detection boring head main shaft and the device of verticality of stand column, one end that cantilever contacts with spindle hole of the present invention There is magnetic, can adsorb on the end face of spindle hole, it is ensured that fit completely with spindle hole end face in cantilever side every time, improve inspection Survey precision.
5. the detection boring head main shaft and the device of verticality of stand column of the present invention, the cross section of cantilever is T-type structure, choosing With aluminum alloy material, it is ensured that cantilever intensity, the measurement error that the deformation instrument of reduction itself brings, reduce cantilever weight Amount, reduces workman's labor intensity in use.
6. the detection boring head main shaft and the device of verticality of stand column of the present invention, datum plate is magnetic, can be direct Absorption, on column, conveniently operates.
7. the detection boring head main shaft and the device of verticality of stand column of the present invention, the making material of detection device is in dimension Repair factory to be readily available, simple in construction, with low cost, easy to use.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for This area
Fig. 1 is the structural representation of a kind of device detecting boring head main shaft and verticality of stand column of the present invention;
Fig. 2 is the knot of the another kind of embodiment of a kind of device detecting boring head main shaft and verticality of stand column of the present invention Structure schematic diagram.
In figure: 1, column;11, dove-tail form guide rail;2, main spindle box;21, spindle hole;3, support bar;4, cushion block;5, cantilever; 6, fixing bearing;7, amesdial;8, datum plate;9, cantilever support bearing.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely retouched State.Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this Bright embodiment, the every other enforcement that those of ordinary skill in the art are obtained under not making creative work premise Example, broadly falls into the scope of protection of the invention.
As it is shown in figure 1, a kind of device detecting boring head main shaft and verticality of stand column that the present invention provides, wherein boring Bed includes column 1, main spindle box 2 and headstock spindle (because during detection, headstock spindle is not yet installed, so being not drawn in accompanying drawing). Column 1 is provided with dove-tail form guide rail 11, and dove-tail form guide rail 11 matches with the dovetail groove of main spindle box 2, and headstock spindle is positioned at master In the spindle hole 21 of axle box 2, headstock spindle is perpendicular to the end face of spindle hole 21.
The device of described detection boring head main shaft and verticality of stand column includes cantilever 5, amesdial 7 and datum plate 8, institute Stating sidewall plane and the laminating or parallel of the end face of spindle hole 21 of cantilever 5 one end, the other end of described cantilever 5 is free end, institute State amesdial 7 and be fixedly connected on the free end of cantilever 5.Described datum plate 8 is orthogonal wing plate and the T junction of base plate composition Structure, the length of an at least wing of described datum plate 8 is less than the height of projection of dove-tail form guide rail 11, the base plate of described datum plate 8 It is close to the upper surface of dove-tail form guide rail 11, the base plate plane of described datum plate 8 and the intersection of wing plate plane and dove-tail form guide rail 11 Crest line overlap, described amesdial 7 probe outside the wing plate of datum plate 8 on, be test reference face outside wing plate.
The Cleaning Principle of this device: we need to detect boring head main shaft and column 1 is the most vertical, but master during detection Axle is not yet installed, owing to main shaft is perpendicular with the end face of spindle hole 21, if so detection determines that the end face of spindle hole 21 is with vertical Post 1 is parallel, and the most provable main shaft is perpendicular with column 1;The column 1 plane in addition to dove-tail form guide rail 11 is all casting plane, table Surface evenness is poor, it is impossible to being used for doing detection benchmark, therefore we select, using dove-tail form guide rail 11 as detection benchmark, to select further Take the incline line of dove-tail form guide rail 11 for detection datum line, i.e. the end face of detection spindle hole 21 whether with the side of dove-tail form guide rail 11 Crest line is parallel;Datum plate 8 is precision manufactureing component, and its wing plate and base plate are perpendicular, the intersection of wing plate and base plate and wing plate phase Parallel, if proving that certain plane is paralleled with wing plate, certain plane the most provable is paralleled with the intersection of wing plate and base plate;Therefore examine During survey, the intersection that the base plate of datum plate 8 is close to the upper surface of dove-tail form guide rail 11, base plate and wing plate is close to dove-tail form guide rail 11 Incline line, if detection proves the end face of spindle hole 21 when paralleling with the wing plate of datum plate 8, the most provable spindle hole 21 End face is paralleled with the incline line of dove-tail form guide rail 11, namely the end face of provable spindle hole 21 is paralleled with column 1, further Provable headstock spindle is perpendicular with column 1.
The detection method of this device:
Step 1: arbitrary position that datum plate 8 is placed on dove-tail form guide rail 11, it is ensured that the base plate of datum plate 8 is close to dovetail The upper surface of type guide rail 11, and the intersection of base plate plane and wing plate plane is in the crest line coincidence of dove-tail form guide rail 11;
Step 2: the side plane not installing one end of amesdial 7 on cantilever 5 is close on the end face of spindle hole 21, mobile Cantilever 5, makes the probe of amesdial 7 abut against on the wing plate of datum plate 8, reads the reading of amesdial 7;
Step 3: another position that datum plate 8 is placed on dove-tail form guide rail 11, it is ensured that the base plate of datum plate 8 is close to dovetail The upper surface of type guide rail 11, and the intersection of base plate plane and wing plate plane is in the crest line coincidence of dove-tail form guide rail 11, repeats step Rapid 2, read second reading of amesdial 7.
Step 4: judge, if the two of amesdial readings are identical or in range of error, then can be derived from spindle hole 21 End face is parallel to the wing plate of datum plate 8, and according to above-mentioned Cleaning Principle, provable headstock spindle is perpendicular with column 1;If thousand Two readings dividing table differ and not in range of error, and the most provable headstock spindle is the most perpendicular with column 1.
A kind of device detecting boring head main shaft and verticality of stand column that the present invention provides, for ease of operation, also may be used So that one end that cantilever 5 contacts with spindle hole 21 is fixed on spindle hole 21 by support means, and cantilever 5 can be at main shaft Rotate in the end face place plane in hole 21.
Support means includes support bar 3, cushion block 4, fixing bearing 6 and cantilever support bearing 9, and described support bar runs through main shaft Hole 21, one end of described support bar 3 sequentially passes through the fixing bearing 6 and cushion block 4 being adjacent on spindle hole 21 from the inside to the outside, described Cushion block 4 and fixing bearing 6 are fixed by the nut screwed on support bar 3, and the other end of described support bar 3 is the most successively Propping up through cantilever support bearing 9 and cantilever 5, described cantilever 5 and the cantilever support bearing 9 being adjacent at spindle hole 21 by screwing Nut on strut 3 is fixed, and described cantilever 5 can rotate in the medial plane of cantilever support bearing 9.Fixed by support means Cantilever 5, can reduce the measurement error that the small variations of each cantilever 5 and the laminating of spindle hole 21 end face brings, and test result is more Add accurately.Cantilever support bearing 9, prevents the cantilever end face direct friction with main shaft in rotation process from destroying spindle hole 21 end Face.
See Fig. 2, the another kind of embodiment of a kind of device detecting boring head main shaft and verticality of stand column of the present invention, Cantilever 5 has magnetic, can adsorb on the end face of spindle hole 21, it is ensured that cantilever side is complete with spindle hole end face the most every time Laminating, improves accuracy of detection.
Preferably, described datum plate 8 has magnetic, adsorbable is fixed on dove-tail form guide rail 11, convenient operation.
Preferably, the cross section of described cantilever 5 is T-shape.
Preferably, described cantilever 5 is aluminum alloy material, it is ensured that cantilever intensity, and the deformation instrument of reduction itself brings Measurement error, reduce cantilevered weights, reduce workman's labor intensity in use.

Claims (7)

1. detecting a device for boring head main shaft and verticality of stand column, described boring machine includes column (1), main spindle box (2) And headstock spindle, described column (1) is provided with dove-tail form guide rail (11), and described main spindle box (2) is provided with spindle hole (21), its Feature is: described device includes cantilever (5), amesdial (7) and datum plate (8), the sidewall plane of described cantilever (5) one end and master The end face laminating or parallel of axis hole (21), the other end of described cantilever (5) is free end, and described amesdial (7) is fixedly connected on The free end of cantilever (5);
Described datum plate (8) is orthogonal wing plate and the T-type structure of base plate composition, at least the one of described datum plate (8) The length of the wing is less than the height of projection of dove-tail form guide rail (11), and the base plate of described datum plate (8) is close to dove-tail form guide rail (11) Upper surface, the base plate plane of described datum plate (8) and the intersection of wing plate plane overlap with the crest line of dove-tail form guide rail (11), described The probe of amesdial (7) is on the wing plate of datum plate (8).
A kind of device detecting boring head main shaft and verticality of stand column the most according to claim 1, is characterized in that: institute State cantilever (5) to be fixed on spindle hole (21) by support means with the laminating of spindle hole (21) end face or parallel one end, described Cantilever (5) can rotate in the end face of spindle hole (21) or the plane parallel with end face.
A kind of device detecting boring head main shaft and verticality of stand column the most according to claim 2, is characterized in that: institute Stating support means and include support bar (3), cushion block (4), fixing bearing (6) and cantilever support bearing (9), described support bar (3) passes through Wearing spindle hole (21), one end of described support bar (3) sequentially passes through the fixing bearing being adjacent on spindle hole (21) from the inside to the outside And cushion block (4), described cushion block (4) and fixing bearing (6) are fixed by the nut that screws on support bar (3), described support (6) The other end of bar (3) sequentially passes through from the inside to the outside and is adjacent at the cantilever support bearing (9) of spindle hole (21) and cantilever (5), described Cantilever (5) and cantilever support bearing (9) are fixed by the nut screwed on support bar (3), and described cantilever (5) can prop up at cantilever Rotate in the medial plane of support bearing (9).
A kind of device detecting boring head main shaft and verticality of stand column the most according to claim 1, is characterized in that: institute Stating cantilever (5) and have magnetic, described cantilever (5) is fixed on the end face of spindle hole (21) by magnetic-adsorption.
A kind of device detecting boring head main shaft and verticality of stand column the most according to claim 1, is characterized in that: institute Stating datum plate (8) and have magnetic, described datum plate (8) is fixed on dove-tail form guide rail (11) by magnetic-adsorption.
A kind of device detecting boring head main shaft and verticality of stand column the most according to claim 1, is characterized in that: institute The cross section stating cantilever (5) is T-shape.
A kind of device detecting boring head main shaft and verticality of stand column the most according to claim 1, is characterized in that: institute Stating cantilever (5) is aluminum alloy material.
CN201610789793.9A 2016-08-31 2016-08-31 A kind of device detecting boring head main shaft and verticality of stand column Expired - Fee Related CN106225653B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004286710A (en) * 2003-03-25 2004-10-14 Sumitomo Heavy Ind Ltd Method and apparatus for attaching linear scale
CN102200424A (en) * 2011-01-19 2011-09-28 万向钱潮股份有限公司 Device and method for measuring verticality of cross shaft
CN103383236A (en) * 2013-06-25 2013-11-06 常州市双成工具有限公司 Device for measuring parallelism degree of forked tail face
CN203356304U (en) * 2013-06-24 2013-12-25 南车二七车辆有限公司 Lateral positioning device of bending machine
CN104289978A (en) * 2014-08-22 2015-01-21 宝鸡石油机械有限责任公司 Machine tool spindle or cutter center and workpiece reference face alignment method
CN105290880A (en) * 2015-11-27 2016-02-03 东方电气集团东方汽轮机有限公司 Device and method for detecting perpendicularity of axis of spindle and reference axis in movement
CN105583691A (en) * 2014-11-14 2016-05-18 江西昌河航空工业有限公司 Parallel adjusting device and method for gantry type machine tool
CN206037915U (en) * 2016-08-31 2017-03-22 湖北三环成套工业有限公司 Detect hang down straightness's device of boring machine headstock main shaft and stand

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004286710A (en) * 2003-03-25 2004-10-14 Sumitomo Heavy Ind Ltd Method and apparatus for attaching linear scale
CN102200424A (en) * 2011-01-19 2011-09-28 万向钱潮股份有限公司 Device and method for measuring verticality of cross shaft
CN203356304U (en) * 2013-06-24 2013-12-25 南车二七车辆有限公司 Lateral positioning device of bending machine
CN103383236A (en) * 2013-06-25 2013-11-06 常州市双成工具有限公司 Device for measuring parallelism degree of forked tail face
CN104289978A (en) * 2014-08-22 2015-01-21 宝鸡石油机械有限责任公司 Machine tool spindle or cutter center and workpiece reference face alignment method
CN105583691A (en) * 2014-11-14 2016-05-18 江西昌河航空工业有限公司 Parallel adjusting device and method for gantry type machine tool
CN105290880A (en) * 2015-11-27 2016-02-03 东方电气集团东方汽轮机有限公司 Device and method for detecting perpendicularity of axis of spindle and reference axis in movement
CN206037915U (en) * 2016-08-31 2017-03-22 湖北三环成套工业有限公司 Detect hang down straightness's device of boring machine headstock main shaft and stand

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李忠杰等: "卧式铣镗床主轴中心线与立柱导轨面垂直度专用检测装备", 《金属加工(冷加工)》 *

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