CN105043188A - Integral type ball track tolerance detection instrument and measurement method for bearing with cross roller - Google Patents
Integral type ball track tolerance detection instrument and measurement method for bearing with cross roller Download PDFInfo
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- CN105043188A CN105043188A CN201510223976.XA CN201510223976A CN105043188A CN 105043188 A CN105043188 A CN 105043188A CN 201510223976 A CN201510223976 A CN 201510223976A CN 105043188 A CN105043188 A CN 105043188A
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Abstract
The invention provides an integral type ball track tolerance detection instrument for a bearing with a cross roller. The detection instrument comprises a positioning support block a, a standard part, a pressing block, a positioning support block b, a dial gauge a, a dial gauge b, a floating test block, a support plate and an instrument base. The support plate is fixed on the instrument base. The support plate is provided with two strip-shaped grooves. The positioning support block a and the positioning support block b are slidably arranged in the two strip-shaped grooves, respectively. The positioning support block a and the positioning support block b are provided with steel balls. The support plate is also provided with the pressing block. The standard part is fixed onto the support plate via the positioning support block a, the positioning support block b and the pressing block. The floating test block is arranged at one end head of a lever. The center of the lever is fixed onto the support plate via a shaft. The other end head of the lever is connected with one end of a spring. The other end of the spring is fixed onto the other edge of the support plate. The dial gauge a and the dial gauge b are also fixed onto the support plate. The pointer of the dial gauge a is in contact with the floating test block. The pointer of the dial gauge b is in contact with the outer wall of the standard part.
Description
Technical field
The present invention relates to a kind of measuring instrument, especially relate to a kind of monoblock type crossed cylindrical roller raceway tolerance detector device and measuring method thereof.
Background technology
At present, in the connection that crossed cylindrical roller bearing has been widely used in industrial robot, medicine equipment, high-precision rotary platform etc. and slew gear, the huge revolving that large-scale crossed cylindrical roller turntable bearing is also applied to mining machinery, constructional engineering machinery etc. supports, and the control of its raceway dimensional accuracy directly has influence on manufacturing accuracy and the serviceable life of crossed cylindrical roller bearing.For monoblock type crossed cylindrical roller bearing, because of its structural particularity, inner ring raceway is V-shaped, two raceway limits its symmetrical center line 45 ° each other relatively of V-arrangement, and on V-arrangement raceway, configure a circle crossed cylindrical roller.Utilize general measuring method cannot detect raceway dimensional accuracy accurately, easily.
The known detection method to crossed cylindrical roller raceway diameter mainly contains two kinds, and one is folder one finished product steel ball indirect inspection.As shown in Figure 1: the method directly measures crossed cylindrical roller bearing inside/outside circle 1 with milscale 3 to press from both sides the rear raceway of steel ball 2 and inside/outside radius wall thickness, carrys out indirect inspection inside/outside circle raceway diameter by wall thickness; Inside/outside raceway dimensional tolerence is indirectly controlled by raceway and inside/outside radius wall thickness difference after control inside/outside circle folder steel ball.The method not only error is comparatively large, and measurement crossed cylindrical roller bearing inner race raceway diameter difference that can only be single and Wall-Thickness Difference, raceway position deviation, ovality, raceway cannot be measured to the isoparametric measurement of beating of datum end face.This kind of method is that naked eyes carry out reading, adds clamping of workpieces and measures, be easy to the accuracy affecting testing result because of human factor, and checkability is very low by artificial rotation milscale screw rod.
Another kind adopts the high precision instruments such as contourgraph to detect inside/outside circle raceway precision.The method needs the high precision instruments such as contourgraph to install to be placed on constant temperature measurement room, then the inside/outside circle processed is removed to constant temperature measurement room and inspects by random samples, not only detect loaded down with trivial details, and can not accomplish the inspection lasso in process of manufacture being carried out to 100%.
Summary of the invention
In order to overcome the deficiency in background technology, the invention discloses a kind of monoblock type crossed cylindrical roller raceway tolerance detector device, this detecting instrument not only structure simple, be easy to operation, and error is low, measure accurately.
Another object of the present invention is the measuring method of openly a kind of monoblock type crossed cylindrical roller raceway tolerance.Adopt this detection method can carry out the inspection of 100% to the lasso raceway dimensional tolerence in process of manufacture and form and position tolerance, effectively reduce positioning error, improve processing detection efficiency.
In order to realize described goal of the invention, the present invention adopts following technical scheme: a kind of monoblock type crossed cylindrical roller raceway tolerance detector device, and described detecting instrument comprises positioning support block a, standard component, briquetting, positioning support block b, clock gauge a, clock gauge b, floats and survey block, back up pad, instrument base; Back up pad is fixed on instrument base, back up pad is provided with two bar-shaped troughs, slides respectively to arrange on positioning support block a4 and positioning support block b, positioning support block a and positioning support block b to be provided with steel ball in two bar-shaped troughs; Back up pad is also provided with briquetting; Standard component is fixing on the supporting plate by positioning support block a, positioning support block b and briquetting; Float and survey the termination, one end that block is arranged on lever, the center of lever is fixing on the supporting plate by axle, linking springs one end, other end termination of lever; The fixing another side on the supporting plate of the other end of spring; Clock gauge a, clock gauge b also fixing on the supporting plate, the pointer of clock gauge a is surveyed block contact with floating; The pointer of clock gauge b and the wall contacts of standard component.
A kind of monoblock type crossed cylindrical roller raceway tolerance detector device, described detecting instrument comprises positioning support block a, standard component, briquetting, positioning support block b, clock gauge a, clock gauge b, back up pad, instrument base; Back up pad is fixed on instrument base, back up pad is provided with two bar-shaped troughs, slides respectively to arrange on positioning support block a and positioning support block b, positioning support block a and positioning support block b to be provided with steel ball in two bar-shaped troughs; Back up pad is also provided with briquetting and lever, and briquetting is arranged on the termination, one end of lever, and the center of lever is fixing on the supporting plate by axle, linking springs one end, other end termination of lever; The fixing another side on the supporting plate of the other end of spring; Standard component is fixing on the supporting plate by positioning support block a, positioning support block b and briquetting; Clock gauge a, clock gauge b also fix on the supporting plate, and clock gauge a is arranged on the outside of standard component, and pointer contacts with the exterior channels of standard component; The pointer of clock gauge b and the wall contacts of standard component.
The main body of back up pad of the present invention is disc, and two bar-shaped troughs are arranged on the radial direction of disc back up pad, and the angle between two bar-shaped troughs is 45 ~ 90 degree; Briquetting is arranged on the other end of disk, forms triangle fix with positioning support block a, positioning support block b.
Back up pad of the present invention also comprises three back shafts, and clock gauge a, clock gauge b are separately fixed on its neutralization two back shafts, on fixing another back shaft on the supporting plate of the other end of spring.
Steel ball size of the present invention equals tested lasso cylindrical roller diameter.
A kind of detection method of monoblock type crossed cylindrical roller bearing outer ring ball track tolerance, its measuring process is: the standard component demarcated (or the processing initial workpiece after detecting) is first installed on surveying instrument and carries out his-and-hers watches by (1), adjustment clock gauge a, the pointer position of clock gauge b, the pointer of clock gauge a is surveyed block and is contacted with floating; The pointer of clock gauge b and the wall contacts of standard component, pointer is at the range at zero point of clock gauge;
(2) pull down standard component, be installed upper workpiece to be measured, adjustment clock gauge a, the pointer position of clock gauge b, and the pointer of clock gauge a is surveyed block 10 contact with floating; The pointer of clock gauge b and the wall contacts of standard component, even dynamics rotates a circle, and observes clock gauge a, clock gauge b total indicator reading and fluctuation range;
(3) be that reference field is measured by workpiece other end to be measured, even dynamics rotates a circle, and observes clock gauge a, clock gauge b total indicator reading and fluctuation range;
(4) twice measurement can compare and measure diameter dimension deviation, ovality, inner ring raceway position deviation, inner ring raceway Wall-Thickness Difference, the inner ring raceway side-sway of workpiece raceway.
A kind of detection method of monoblock type crossed cylindrical roller bearing inner race raceway tolerance, its measuring process is: the standard component demarcated (or the processing initial workpiece after detecting) is first installed on surveying instrument and carries out his-and-hers watches by (1), adjustment clock gauge a, the pointer position of clock gauge b, the pointer of clock gauge a contacts with briquetting; The pointer of clock gauge b and the wall contacts of standard component, pointer is at the range at zero point of clock gauge;
(2) pull down standard component, be installed upper workpiece to be measured, adjustment clock gauge a, the pointer position of clock gauge b, and the pointer of clock gauge a contacts with briquetting; The pointer of clock gauge b and the wall contacts of standard component, even dynamics rotates a circle, and observes clock gauge a, clock gauge b total indicator reading and fluctuation range;
(3) be that reference field is measured by workpiece other end to be measured, even dynamics rotates a circle, and observes clock gauge a, clock gauge b total indicator reading and fluctuation range;
(4) twice measurement can compare and measure diameter dimension deviation, ovality, inner ring raceway position deviation, inner ring raceway Wall-Thickness Difference, the inner ring raceway side-sway of workpiece raceway.
Owing to have employed technique scheme, the present invention has following beneficial effect: surveying instrument principle of the present invention is that (to relative method Mechanical measurement device comparative measurement method compared by measured parameter and certain standard component, thus draw the deviate of measured parameter relative to standard volume, because standard volume is known.Therefore, the whole value of measured parameter equals the simple algebraic sum of deviate and standard volume.So just conveniently can measure the whole value of measured parameter), positioning supporting point steel ball curvature of the present invention adopts the curvature selecting cylindrical roller diameter to be close with tested lasso, within/outer ring raceway location, measure inside/outside circle raceway correlation parameter, the inspection of 100% can be carried out to the lasso raceway dimensional tolerence in process of manufacture and form and position tolerance, effective minimizing positioning error, improves processing detection efficiency.Detecting instrument not only structure simple, be easy to operation, and error is low, measure accurately and reliably.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing measurement crossed cylindrical roller bearing outer ring ball track diameter.
Fig. 2 is the structural representation of existing measurement crossed cylindrical roller bearing inner race raceway diameter.
Fig. 3 is the detecting instrument structural representation that the present invention measures crossed cylindrical roller bearing outer ring ball track diameter.
Fig. 4 is the detecting instrument structural representation that the present invention measures crossed cylindrical roller bearing inner race raceway diameter.
Fig. 5 is the schematic diagram that the present invention measures crossed cylindrical roller bearing outer ring ball track diameter.
Fig. 6 is the close-up schematic view of Fig. 5 fulcrum a.
Fig. 7 is the close-up schematic view of Fig. 5 fulcrum b.
Fig. 8 is the schematic diagram that the present invention measures crossed cylindrical roller bearing inner race raceway diameter.
Fig. 9 is the close-up schematic view of Fig. 8 fulcrum a.
Figure 10 is the close-up schematic view of Fig. 8 fulcrum b.
In figure: 1-workpiece; 2-steel ball; 3-milscale; 4-positioning support block a; 5-standard component; 6-briquetting; 7-positioning support block b; 8-clock gauge a; 9-clock gauge b; 10-floats and surveys block; 11-back up pad; 12-instrument base.
Embodiment
By explanation the present invention that the following examples can be detailed, disclose object of the present invention and be intended to protect all technological improvements in the scope of the invention.
Embodiment one
A kind of monoblock type crossed cylindrical roller bearing outer ring ball track tolerance detector device, described detecting instrument comprises positioning support block a4, standard component 5, briquetting 6, positioning support block b7, clock gauge a8, clock gauge b9, floats and survey block 10, back up pad 11, instrument base 12; Back up pad 11 is fixed on instrument base 12, back up pad 11 is provided with two bar-shaped troughs, slides respectively to arrange on positioning support block a4 and positioning support block b7, positioning support block a4 and positioning support block b7 to be provided with steel ball in two bar-shaped troughs; Back up pad 11 is also provided with briquetting 6; Standard component 5 is fixed in back up pad 11 by positioning support block a4, positioning support block b7 and briquetting 6; Float and survey the termination, one end that block 10 is arranged on lever, the center of lever is fixed in back up pad 11 by axle, linking springs one end, other end termination of lever; The other end of spring is fixed on another side in back up pad 11; Clock gauge a8, clock gauge b9 are also fixed in back up pad 11, and the pointer of clock gauge a8 is surveyed block 10 and contacted with floating; The pointer of clock gauge b9 and the wall contacts of standard component 5.
The main body of described back up pad 11 is disc, and two bar-shaped troughs are arranged on the radial direction of disc back up pad 11, and the angle between two bar-shaped troughs is 45 ~ 90 degree; Briquetting 6 is arranged on the other end of disk, forms triangle fix with positioning support block a4, positioning support block b7.
Described back up pad 11 also comprises three back shafts, and clock gauge a8, clock gauge b9 are separately fixed on its neutralization two back shafts, and the other end of spring to be fixed in back up pad 11 on another back shaft.
Described steel ball size equals tested lasso cylindrical roller diameter.
Its measuring process is: (1) is first by the standard component 5(demarcated or the processing initial workpiece after detecting) be installed on surveying instrument and carry out his-and-hers watches, adjustment clock gauge a8, the pointer position of clock gauge b9, the pointer of clock gauge a8 is surveyed block 10 contact with floating; The pointer of clock gauge b9 and the wall contacts of standard component 5, pointer is at the range at zero point of clock gauge;
(2) pull down standard component 5, be installed upper workpiece 1 to be measured, adjustment clock gauge a8, the pointer position of clock gauge b9, and the pointer of clock gauge a8 is surveyed block 10 contact with floating; The pointer of clock gauge b9 and the wall contacts of standard component 5, even dynamics rotates a circle, and observes clock gauge a8, clock gauge b9 total indicator reading and fluctuation range;
(3) be that reference field is measured by workpiece 1 other end to be measured, even dynamics rotates a circle, and observes clock gauge a8, clock gauge b9 total indicator reading and fluctuation range;
(4) twice measurement can compare and measure diameter dimension deviation, ovality, inner ring raceway position deviation, inner ring raceway Wall-Thickness Difference, the inner ring raceway side-sway of workpiece 1 raceway.
Embodiment 2
A kind of monoblock type crossed cylindrical roller raceway tolerance detector device, described detecting instrument comprises positioning support block a4, standard component 5, briquetting 6, positioning support block b7, clock gauge a8, clock gauge b9, back up pad 11, instrument base 12; Back up pad 11 is fixed on instrument base 12, back up pad 11 is provided with two bar-shaped troughs, slides respectively to arrange on positioning support block a4 and positioning support block b7, positioning support block a4 and positioning support block b7 to be provided with steel ball in two bar-shaped troughs; Back up pad 11 is also provided with briquetting 6 and lever, and briquetting 6 is arranged on the termination, one end of lever, and the center of lever is fixed in back up pad 11 by axle, linking springs one end, other end termination of lever; The other end of spring is fixed on another side in back up pad 11; Standard component 5 is fixed in back up pad 11 by positioning support block a4, positioning support block b7 and briquetting 6; Clock gauge a8, clock gauge b9 are also fixed in back up pad 11, and clock gauge a8 is arranged on the outside of standard component 5, and pointer contacts with the exterior channels of standard component 5; The pointer of clock gauge b9 and the wall contacts of standard component 5.
The main body of described back up pad 11 is disc, and two bar-shaped troughs are arranged on the radial direction of disc back up pad 11, and the angle between two bar-shaped troughs is 45 ~ 90 degree; Briquetting 6 is arranged on the other end of disk, forms triangle fix with positioning support block a4, positioning support block b7.
Described back up pad 11 also comprises three back shafts, and clock gauge a8, clock gauge b9 are separately fixed on its neutralization two back shafts, and the other end of spring to be fixed in back up pad 11 on another back shaft.
Described steel ball size equals tested lasso cylindrical roller diameter.
Its measuring process is: (1) is first by the standard component 5(demarcated or the processing initial workpiece after detecting) be installed on surveying instrument and carry out his-and-hers watches, adjustment clock gauge a8, the pointer position of clock gauge b9, the pointer of clock gauge a8 is surveyed block 10 contact with floating; The pointer of clock gauge b9 and the wall contacts of standard component 5, pointer is at the range at zero point of clock gauge;
(2) pull down standard component 5, be installed upper workpiece 1 to be measured, adjustment clock gauge a8, the pointer position of clock gauge b9, and the pointer of clock gauge a8 contacts with briquetting 6; The pointer of clock gauge b9 and the wall contacts of standard component 5, even dynamics rotates a circle, and observes clock gauge a8, clock gauge b9 total indicator reading and fluctuation range;
(3) be that reference field is measured by workpiece 1 other end to be measured, even dynamics rotates a circle, and observes clock gauge a8, clock gauge b9 total indicator reading and fluctuation range;
(4) twice measurement can compare and measure diameter dimension deviation, ovality, inner ring raceway position deviation, inner ring raceway Wall-Thickness Difference, the inner ring raceway side-sway of workpiece 1 raceway.
Part not in the detailed description of the invention is prior art.
Claims (7)
1. a monoblock type crossed cylindrical roller raceway tolerance detector device, is characterized in that: described detecting instrument comprises positioning support block a4, standard component 5, briquetting 6, positioning support block b7, clock gauge a8, clock gauge b9, floats and survey block 10, back up pad 11, instrument base 12; Back up pad 11 is fixed on instrument base 12, back up pad 11 is provided with two bar-shaped troughs, slides respectively to arrange on positioning support block a4 and positioning support block b7, positioning support block a4 and positioning support block b7 to be provided with steel ball in two bar-shaped troughs; Back up pad 11 is also provided with briquetting 6; Standard component 5 is fixed in back up pad 11 by positioning support block a4, positioning support block b7 and briquetting 6; Float and survey the termination, one end that block 10 is arranged on lever, the center of lever is fixed in back up pad 11 by axle, linking springs one end, other end termination of lever; The other end of spring is fixed on another side in back up pad 11; Clock gauge a8, clock gauge b9 are also fixed in back up pad 11, and the pointer of clock gauge a8 is surveyed block 10 and contacted with floating; The pointer of clock gauge b9 and the wall contacts of standard component 5.
2. a monoblock type crossed cylindrical roller raceway tolerance detector device, is characterized in that: described detecting instrument comprises positioning support block a4, standard component 5, briquetting 6, positioning support block b7, clock gauge a8, clock gauge b9, back up pad 11, instrument base 12; Back up pad 11 is fixed on instrument base 12, back up pad 11 is provided with two bar-shaped troughs, slides respectively to arrange on positioning support block a4 and positioning support block b7, positioning support block a4 and positioning support block b7 to be provided with steel ball in two bar-shaped troughs; Back up pad 11 is also provided with briquetting 6 and lever, and briquetting 6 is arranged on the termination, one end of lever, and the center of lever is fixed in back up pad 11 by axle, linking springs one end, other end termination of lever; The other end of spring is fixed on another side in back up pad 11; Standard component 5 is fixed in back up pad 11 by positioning support block a4, positioning support block b7 and briquetting 6; Clock gauge a8, clock gauge b9 are also fixed in back up pad 11, and clock gauge a8 is arranged on the outside of standard component 5, and pointer contacts with the exterior channels of standard component 5; The pointer of clock gauge b9 and the wall contacts of standard component 5.
3. the detecting instrument of monoblock type crossed cylindrical roller raceway tolerance as claimed in claim 1 or 2, it is characterized in that: the main body of described back up pad 11 is disc, article two, bar-shaped trough is arranged on the radial direction of disc back up pad 11, and the angle between two bar-shaped troughs is 45 ~ 90 degree; Briquetting 6 is arranged on the other end of disk, forms triangle fix with positioning support block a4, positioning support block b7.
4. the detecting instrument of monoblock type crossed cylindrical roller raceway tolerance as claimed in claim 3, it is characterized in that: described back up pad 11 also comprises three back shafts, clock gauge a8, clock gauge b9 are separately fixed on its neutralization two back shafts, and the other end of spring to be fixed in back up pad 11 on another back shaft.
5. the detecting instrument of monoblock type crossed cylindrical roller raceway tolerance as claimed in claim 1 or 2, is characterized in that: steel ball size equals tested lasso cylindrical roller diameter.
6. the detection method of a monoblock type crossed cylindrical roller bearing outer ring ball track tolerance as claimed in claim 1, it is characterized in that: its measuring process is: (1) is first by the standard component 5(demarcated or the processing initial workpiece after detecting) be installed on surveying instrument and carry out his-and-hers watches, adjustment clock gauge a8, the pointer position of clock gauge b9, the pointer of clock gauge a8 is surveyed block 10 and is contacted with floating; The pointer of clock gauge b9 and the wall contacts of standard component 5, pointer is at the range at zero point of clock gauge;
(2) pull down standard component 5, be installed upper workpiece 1 to be measured, adjustment clock gauge a8, the pointer position of clock gauge b9, and the pointer of clock gauge a8 is surveyed block 10 contact with floating; The pointer of clock gauge b9 and the wall contacts of standard component 5, even dynamics rotates a circle, and observes clock gauge a8, clock gauge b9 total indicator reading and fluctuation range;
(3) be that reference field is measured by workpiece 1 other end to be measured, even dynamics rotates a circle, and observes clock gauge a8, clock gauge b9 total indicator reading and fluctuation range;
(4) twice measurement can compare and measure diameter dimension deviation, ovality, inner ring raceway position deviation, inner ring raceway Wall-Thickness Difference, the inner ring raceway side-sway of workpiece 1 raceway.
7. the detection method of a monoblock type crossed cylindrical roller bearing inner race raceway tolerance as claimed in claim 2, it is characterized in that: its measuring process is: (1) is first by the standard component 5(demarcated or the processing initial workpiece after detecting) be installed on surveying instrument and carry out his-and-hers watches, adjustment clock gauge a8, the pointer position of clock gauge b9, the pointer of clock gauge a8 contacts with briquetting 6; The pointer of clock gauge b9 and the wall contacts of standard component 5, pointer is at the range at zero point of clock gauge;
(2) pull down standard component 5, be installed upper workpiece 1 to be measured, adjustment clock gauge a8, the pointer position of clock gauge b9, and the pointer of clock gauge a8 contacts with briquetting 6; The pointer of clock gauge b9 and the wall contacts of standard component 5, even dynamics rotates a circle, and observes clock gauge a8, clock gauge b9 total indicator reading and fluctuation range;
(3) be that reference field is measured by workpiece 1 other end to be measured, even dynamics rotates a circle, and observes clock gauge a8, clock gauge b9 total indicator reading and fluctuation range;
(4) twice measurement can compare and measure diameter dimension deviation, ovality, inner ring raceway position deviation, inner ring raceway Wall-Thickness Difference, the inner ring raceway side-sway of workpiece 1 raceway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510223976.XA CN105043188A (en) | 2015-05-06 | 2015-05-06 | Integral type ball track tolerance detection instrument and measurement method for bearing with cross roller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510223976.XA CN105043188A (en) | 2015-05-06 | 2015-05-06 | Integral type ball track tolerance detection instrument and measurement method for bearing with cross roller |
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| CN105043188A true CN105043188A (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510223976.XA Pending CN105043188A (en) | 2015-05-06 | 2015-05-06 | Integral type ball track tolerance detection instrument and measurement method for bearing with cross roller |
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| CN108444373A (en) * | 2018-04-02 | 2018-08-24 | 中国航发哈尔滨轴承有限公司 | A kind of standard component and method of detection bearing retainer pocket hole perpendicularity |
| CN108827214A (en) * | 2018-09-10 | 2018-11-16 | 洛阳Lyc轴承有限公司 | A kind of detection device and method of super large type bearing ring outer diameter |
| CN110307768A (en) * | 2019-08-02 | 2019-10-08 | 大连民族大学 | A kind of the screw path dimension detecting device and its application method of ball-screw |
| CN114812349A (en) * | 2022-06-28 | 2022-07-29 | 济宁市金佳液压有限公司 | Stator trocar tooth slot geometric tolerance detection device and detection method |
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| CN108444373A (en) * | 2018-04-02 | 2018-08-24 | 中国航发哈尔滨轴承有限公司 | A kind of standard component and method of detection bearing retainer pocket hole perpendicularity |
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| CN110307768A (en) * | 2019-08-02 | 2019-10-08 | 大连民族大学 | A kind of the screw path dimension detecting device and its application method of ball-screw |
| CN114812349A (en) * | 2022-06-28 | 2022-07-29 | 济宁市金佳液压有限公司 | Stator trocar tooth slot geometric tolerance detection device and detection method |
| CN114812349B (en) * | 2022-06-28 | 2022-09-09 | 济宁市金佳液压有限公司 | Stator trocar tooth slot geometric tolerance detection device and detection method |
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Application publication date: 20151111 |