CN107144205A - A kind of wall thickness measuring device and detection method - Google Patents
A kind of wall thickness measuring device and detection method Download PDFInfo
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- CN107144205A CN107144205A CN201710530065.0A CN201710530065A CN107144205A CN 107144205 A CN107144205 A CN 107144205A CN 201710530065 A CN201710530065 A CN 201710530065A CN 107144205 A CN107144205 A CN 107144205A
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- wall thickness
- measuring staff
- handle
- measured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The present invention relates to a kind of wall thickness measuring device and detection method, wall thickness measuring device includes handle A, handle B and a pair of measuring staffs, handle A middle part rotates with handle B middle part and is connected, handle A and handle B end are equipped with test arm, measuring staff is slidably connected with test arm, the end of measuring staff is provided with gauge head, and gauge head is rotated with measuring staff and is connected, and measuring staff is provided with scale A；Detection method gets around the method that the interference surface of the closed ring part with complex surface is measured to wall thickness including the use of wall thickness measuring device measurement, use technical scheme, wall thickness measuring device has got around part to be measured and the interference surface of measurement apparatus, part need not be destroyed in itself, wall thickness value can be measured, the detection method is averaged after selecting multiple measurement points to measure, the average value selection standard block according to obtained by measurement further measures the actual value for obtaining part wall thickness to be measured again, it is reliable with measurement result, measurement accuracy is high, the features such as measurement error is small.
Description
Technical field
The present invention relates to machine components detection technique field, more particularly to a kind of wall thickness measuring device and detection method.
Background technology
In mechanical processing industry, to improve machining product quality, it is typically necessary and part each size, position is entered
Row measurement, in the prior art, conventional detection instrument mainly has tape measure, slide measure, screw-thread micrometer, dial gauge etc., with
Machinery manufacturing industry is continued to develop, particularly in Aeronautics and Astronautics industrial circle, more and more using some peculiarly shaped zero
Part, the technical requirements of these special-shaped parts are higher, and use existing detection instrument can not often be carried out to its some size
Detection, for example, having a kind of " N " font annular thin-wall parts, the dimensional tolerance of its inclined-plane wall thickness in certain type aero-engine
It is required that being ± 0.1 millimeter, if being detected using existing detection instrument to its inclined-plane wall thickness, due to the wall meeting of part top and bottom
Interference is caused to detection instrument, conventional detection instrument is not applicable, if part portion is destroyed, although wall can be detected
Thickness, but the use of part itself is have impact on, carry out detecting that the tow sides of N-type component with inclined plane are same according to three coordinate detectors
The diameter value of height calculates wall thickness value indirectly, but this detection method is higher to operator's technical requirements, operating difficulties, and
Operator can not also judge whether test point tow sides are in sustained height position, therefore, what this detection method was obtained
Testing result error is larger.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of wall thickness measuring device and detection method.
The invention provides a kind of wall thickness measuring device, the wall thickness measuring device includes handle A, handle B and a pair of surveys
Bar, the middle part of the handle A rotates with handle B middle part and is connected, and the end of the handle A and handle B are equipped with test arm, described
Measuring staff is slidably connected with test arm, and the end of the measuring staff is provided with gauge head, and the gauge head is rotated with measuring staff and is connected, set on the measuring staff
There is scale A.
The end face of the test arm is provided with lock-screw, and the end face of lock-screw is connected with the measuring staff lateral surface.
Scale B, scale B minimum indexing of the minimum indexing less than the scale A are additionally provided with the test arm.
The handle A is provided with measurement table, and measurement table has measurement bar, and the end face of measurement bar is connected with the handle B.
The measurement table is dial gauge.
The measurement apparatus also includes spring, and the two ends of spring are connected with the handle A and handle B respectively.
The present invention also provides a kind of method for testing wall thickness, comprises the following steps：
Comprise the following steps：
Step one：The position of several test points is marked on part wall to be measured；
Step 2：At least one described measuring staff is unclamped, part to be measured is put between the measuring staff, the measuring staff is slided,
The gauge head is rotated, makes the gauge head vertical with the test point wall of one of them in step one, makes the measurement list index
Reading is reached within pressure table depth value, is rotated the measurement table dial plate, pointer in the measurement table is overlapped with zero groove, is fastened
The measuring staff；
Step 3：According to the scale on the measuring staff and test arm, read and record respectively described in both sides on measuring staff and test arm
Scale value X1 and X2；
Step 4：Scale value X1 and X2 sum described in calculation procedure three on measuring staff and the test arm, is obtained in step 2
The thickness value X of the test point；
Step 5：Repeat step two measures the thickness value X of all test points successively to step 4；
Step 6：The thickness value X of all test points described in step 5 arithmetic average is calculated, part to be measured is obtained
The average value of wall thickness
Step 7：The measuring staff is unclamped, wall thickness measuring device is taken out；
Step 8：The average value of part wall thickness to be measured according to step 6Selection thickness is the part to be measured
The average value of wall thicknessStandard gauge block；
Step 9：Standard gauge block described in step 8 is put between the measuring staff, the measuring staff is slided, described survey is rotated
Head, makes the gauge head vertical with standard gauge block side, the scale reading on the measuring staff and the test arm is designated as step 6
Described in part wall thickness to be measured average value
Step 10：The measurement table dial plate is rotated, the outer aperture needle of the measurement table is overlapped with zero groove, reads and record
The measurement table inner ring pointer value δ；
Step 11：Part wall thickness value Y to be measured is calculated, part wall thickness value Y to be measured meets following relation：
The quantity of test point is at least 6 described in the step one.
It using the central axis of the part to be measured is pivot according to Circle-Array that test point described in the step one, which is,
What row were evenly arranged.
Table depth value is pressed to be less than 1 millimeter described in the step 2.
The beneficial effects of the present invention are：
Using wall thickness measuring device provided by the present invention, the wall thickness measuring device includes handle A, handle B and a pair
Measuring staff, the middle part of the handle A rotates with handle B middle part and is connected, and the end of the handle A and handle B are equipped with test arm, institute
State measuring staff to be slidably connected with test arm, the end of the measuring staff is provided with gauge head, and the gauge head is rotated with measuring staff and is connected, on the measuring staff
Provided with scale A；The detection method measures the closed ring part with complex surface including the use of the wall thickness measuring device
Wall thickness method, using technical scheme, wall thickness measuring device has got around the dry of part to be measured and measurement apparatus part
Face is related to, wall thickness value can be measured in the case where shaped part structure need not be broken, the detection method is by selecting multiple measurement points
Averaged after measuring, but further measurement obtains part wall thickness to be measured to the average value selection standard block according to obtained by measurement
Actual value, measurement result is reliable, and measurement accuracy is by the accuracy guarantee of used measurement table, and present invention preferably uses dial gauge
As measurement table, measurement accuracy is up to micron order, and measurement apparatus is simple in construction, and measurement error is small, suitable in Aeronautics and Astronautics industry
Wide popularization and application in the parts quality detection work in field.
Brief description of the drawings
Fig. 1 is the structural representation of wall thickness measuring device of the present invention；
Fig. 2 is the connection diagram of test arm of the present invention and measuring staff；
Fig. 3 is the connection diagram of measuring staff of the present invention and gauge head；
Fig. 4 is the schematic diagram of method for testing wall thickness of the present invention.
In figure：1- handles A, 2- handle B, 3- measurement table, 4- measuring staffs, 5- test arms, 6- lock-screws, 7- gauge heads, 8- springs,
9- spacer pins, 41- scales A, 51- scale B.
Embodiment
Technical scheme is described further below in conjunction with accompanying drawing, but required protection domain does not limit to
In described；
The invention provides a kind of wall thickness measuring device, as shown in Figure 1, Figure 2, Figure 3 shows, including handle A1, handle B2 and one
To measuring staff 4, handle A1 middle part rotates with handle B2 middle part and is connected, and handle A1 and handle B2 end are equipped with test arm 5, surveys
Bar 4 is slidably connected with test arm 5, and the end of measuring staff 4 is provided with gauge head 7, and gauge head 7 is rotated with measuring staff 4 and is connected, and measuring staff 4 is provided with scale
A41.Using technical scheme, further, it is preferable to which scale A41 minimum indexing is 1 millimeter, the wall thickness measuring device
It is simple in construction, it is easily manufactured, the mesh for getting around the closed ring part wall with complex surface is can reach by the setting of test arm
, such as the measurement to the middle bevels thickness of " N " font ring-shaped thin-walled part has scale in measurement bar, according in measurement bar
Scale can read the wall thickness value of part to be measured, because measuring staff is set to a pair, when part to be measured is very big, if one of survey
When scale value on bar is difficult to read, then the wall thickness value of part to be measured can be read by the scale value on another measuring staff, is made
With conveniently.
The end face of test arm 5 is provided with lock-screw 6, and lock-screw 6 is threadedly coupled with test arm 5, its end face and the lateral surface of measuring staff 4
Connection.Using technical scheme, the effect of lock-screw 5 is, when measured value reaches stable state, to make measuring staff
Locking, consequently facilitating operator reads data, is prevented because measurement apparatus is rocked and produces the situation for reading error in data.
Scale B51, scale B51 minimum indexing of the minimum indexing less than scale A41 are additionally provided with test arm 5.Use this hair
Bright technical scheme, further, scale B51 minimum indexing is preferably 0.9 millimeter, and the scale on test arm is equivalent to vernier calliper
Secondary ruler on chi, and the scale on measuring staff is equivalent to the main scale on slide measure, in use, reading the quarter on main scale measuring staff first
Angle value, then observes the numerical value of the graduation mark alignd on secondary ruler test arm with main scale measuring staff, using this measurement apparatus, makes measurement
Precision brings up to 0.02 millimeter of precision from 1 millimeter.
Handle A1 is provided with measurement table 3, and measurement table 3 has measurement bar, and the end face of measurement bar is connected with handle B2.Use this hair
Bright technical scheme, further, it is preferable to the measurement accuracy of measurement apparatus of the present invention further be improved using measurement table, due to surveying
Arm is fixedly connected with handle, therefore, and the scope that handle is swung is the scope for characterizing test arm movement, and the scope that handle is swung can be from
Read in measurement table 3.
Measurement table 3 is dial gauge.Using technical scheme, further preferred measurement table 3 is dial gauge, dial gauge
Precision up to micron order, can also further use amesdial, the measurement accuracy of measurement apparatus of the present invention is carried significantly
Height, and dial gauge has relatively low Costco Wholesale, cost performance is higher.
Measurement apparatus also includes spring 8, and the two ends of spring 8 are connected with handle 1 respectively.Using technical scheme,
Further, it is preferable to spring 8 is extension spring, make when using measurement apparatus, make measuring staff closely with part paste on wall to be measured
Close, reduce error, improve measurement accuracy, on the other hand, operator is used too big pressure or pulling force
Measurement apparatus is brought into close contact with part wall to be measured, further, on handle be additionally provided with spacer pin 9, so that measurement dress
Put when vacant, handle will not damage measurement table 3 due to the pulling force of spring 8.
As shown in figure 4, the present invention also provides a kind of method for testing wall thickness, comprise the following steps：
Step one：The position of several test points is marked on part wall to be measured；The technical side provided using the present invention
Case, for large thin-wall ring-shaped work pieces, it is necessary to measure multiple test points on the side face of ring-shaped work pieces in the hope of average value,
Make measured value more reliable,, will not when thin-walled parts produce part warpage, deformation closer to the actual value of part to be measured
Influence measurement result.
Step 2：At least one measuring staff 4 is unclamped, part to be measured is put between measuring staff 4, measuring staff 4 is slided, gauge head 7 is rotated,
Make gauge head 7 vertical with one of test point wall in step one, the total indicator reading of measurement table 3 is reached within pressure table depth value,
The dial plate of rotation measuring table 3, makes pointer in measurement table 3 be overlapped with zero groove, fastens measuring staff 4；The technical side provided using the present invention
Case, the wall thickness value of annular thin-wall parts can be roughly obtained by step 2, the value can be read directly from measuring staff, when thin-walled ring
When the shape of shape part is larger, if the scale value on one of measuring staff can not be read, the scale value on the measuring staff can be used to adjust
Section zero, and wall-thickness measurement value is read from the scale on another measuring staff, by step 2, measurement accuracy can reach 1 milli
Rice or so.
Step 3：According to the scale on measuring staff 4 and test arm 5, the quarter on both sides measuring staff 4 and test arm 5 is read and recorded respectively
Angle value X1 and X2；The technical scheme provided using the present invention, the scale value X1 and X2 that are obtained have reacted the wall thickness of two pieces to be measured
Value, the measurement accuracy of measuring staff is 1 millimeter, adds the accuracy compensation on test arm, measurement accuracy is improved to 0.02 millimeter.
Step 4：Scale value X1 and X2 sum on the measuring staff 4 of calculation procedure three and test arm 5, obtains the thickness value of test point
X；The technical scheme provided using the present invention, the thickness value X of test point has more truly reacted the true of part wall thickness to be measured
Value, the measurement accuracy of the value is identical with the precision of slide measure conventional at present, is 0.02 millimeter.
Step 5：Repeat step two measures the thickness value X of all test points successively to step 4；Present invention offer is provided
Technical scheme, for large thin-wall ring-shaped work pieces, it is necessary to multiple test points on the side face of ring-shaped work pieces are measured in the hope of
Average value is obtained, makes measured value more reliable, closer to the actual value of part to be measured, when thin-walled parts produce part warpage, change
During shape, measurement result will not be influenceed.
Step 6：The thickness value X of all test points in step 5 arithmetic average is calculated, part wall thickness to be measured is obtained
Average valueThe technical scheme provided using the present invention, for large thin-wall ring-shaped work pieces, it is necessary to the side face of ring-shaped work pieces
Upper multiple test points are measured in the hope of average value, make measured value more reliable, closer to the actual value of part to be measured, when
When thin-walled parts produce part warpage, deformation, measurement result will not be influenceed.
Step 7：Measuring staff 4 is unclamped, wall thickness measuring device is taken out；
Step 8：According to the average value of part wall thickness to be measured in step 6It is the flat of part wall thickness to be measured to select thickness
AverageStandard gauge block；The technical scheme provided using the present invention, due to the average value of part wall thickness to be measuredFor to multiple
The arithmetic mean of instantaneous value that measurement point is repeatedly measured, with higher reliability and validity, further, due to large thin-wall part
Shape and structure is larger, and further raising measurement accuracy is more difficult, therefore, is carried out using the standard gauge block with standard value indirect
Measurement, is on the one hand easy to observed reading, on the other hand, measurement result is more realistically reacted the wall thickness of part to be measured.
Step 9：Step 8 Plays gauge block is put between measuring staff 4, slide measuring staff 4, rotate gauge head 7, make gauge head 7 with
Standard gauge block side is vertical, the scale reading on measuring staff 4 and test arm 5 is designated as the average value of part wall thickness to be measured in step 6The technical scheme provided using the present invention, is designated as to be measured zero in step 6 when making the scale reading on measuring staff 3 and test arm 4
The average value of part wall thicknessWhen, the reading in measurement table 3 is the error for having reacted part wall thickness to be measured.
Step 10：The dial plate of rotation measuring table 3, makes the outer aperture needle of measurement table 3 be overlapped with zero groove, reads and record measurement table
3 inner ring pointer value δ；The technical scheme provided using the present invention, for example, when the reading of interior aperture needle in measurement table 3 is 0.5 milli
Meter Shi, then the wall thickness actual value of part to be measured is the thickness value and 0.5 millimeter of sum of standard gauge block, if inner ring refers in measurement table 3
When the reading of pin is -0.5 millimeter, then the wall thickness actual value of part to be measured is the thickness value and -0.5 millimeter of sum of standard gauge block,
Because the precision of measurement table determines the accuracy rating of the measured value acquired in measurement apparatus of the present invention, when using dial gauge,
Measurement accuracy can reach 0.003 millimeter, i.e. 3 micron orders.
Step 11：Part wall thickness value Y to be measured is calculated, part wall thickness value Y to be measured meets following relation：Make
With the technical scheme that provides of the present invention, for example, when the reading of aperture needle is 0.5 millimeter in measurement table 3, then part to be measured
Wall thickness actual value is the thickness value and 0.5 millimeter of sum of standard gauge block, if the reading of aperture needle is -0.5 millimeter in measurement table 3
When, then the wall thickness actual value of part to be measured is the thickness value and -0.5 millimeter of sum of standard gauge block, because the precision of measurement table is determined
The accuracy rating of the measured value acquired in measurement apparatus of the present invention is determined, when using dial gauge, measurement accuracy can reach 0.003
Millimeter, i.e. 3 micron orders.
The quantity of test point is at least 6 in step one.The technical scheme provided using the present invention, for large thin-wall ring
Shape part makes measured value more reliable, more, it is necessary to measure multiple test points on the side face of ring-shaped work pieces in the hope of average value
Close to the actual value of part to be measured, when thin-walled parts produce part warpage, deformation, measurement result will not be influenceed.
Test point is to be evenly arranged using the central axis of part to be measured as pivot according to circumference array in step one.
For large thin-wall ring-shaped work pieces, it is necessary to measure multiple test points on the side face of ring-shaped work pieces in the hope of average value, make
Measured value is more reliable, closer to the actual value of part to be measured, when thin-walled parts produce part warpage, deformation, Bu Zhiying
Ring measurement result.
Table depth value is pressed to be less than 1 millimeter in step 2.The technical scheme provided using the present invention, when using measurement table,
In order to reduce measurement error, it is necessary to make measurement bar be contacted in the presence of certain pretightning force with tested surface, apply the big of pretightning force
It is small to reach that pressure table depth value is defined to measure list index, it is generally preferable that the scope of pressure table depth value is 1 millimeter.
Claims (10)
1. a kind of wall thickness measuring device, it is characterised in that：Including handle A (1), handle B (2) and a pair of measuring staffs (4), the handle
A (1) middle part rotates with handle B (2) middle part and is connected, and the handle A (1) and handle B (2) end are equipped with test arm (5),
The measuring staff (4) is slidably connected with test arm (5), and the end of the measuring staff (4) is provided with gauge head (7), the gauge head (7) and measuring staff
(4) connection is rotated, the measuring staff (4) is provided with scale A (41).
2. a kind of wall thickness measuring device as claimed in claim 1, it is characterised in that：The end face of the test arm (5) is provided with locking
Screw (6), the end face of lock-screw (6) is connected with the measuring staff (4) lateral surface.
3. a kind of wall thickness measuring device as claimed in claim 1, it is characterised in that：Scale B is additionally provided with the test arm (5)
(51), minimum indexing of scale B (51) the minimum indexing less than the scale A (41).
4. a kind of wall thickness measuring device as claimed in claim 1, it is characterised in that：The handle A (1) is provided with measurement table
(3), measurement table (3) has measurement bar, and the end face of measurement bar is connected with the handle B (2).
5. a kind of wall thickness measuring device as claimed in claim 4, it is characterised in that：The measurement table (3) is dial gauge.
6. a kind of wall thickness measuring device as claimed in claim 1, it is characterised in that：The measurement apparatus also includes spring (8),
The two ends of spring (8) are connected with the handle A (1) and handle B (2) respectively.
7. a kind of detection method of wall thickness measuring device using as described in any one of claim 1 to 6, it is characterised in that：Bag
Include following steps：
Step one：The position of several test points is marked on part wall to be measured；
Step 2：At least one described measuring staff (4) is unclamped, part to be measured is put between the measuring staff (4), the measuring staff is slided
(4) gauge head (7), is rotated, makes the gauge head (7) vertical with the test point wall of one of them in step one, is made described
Measurement table (3) total indicator reading is reached within pressure table depth value, rotates measurement table (3) dial plate, makes to refer in the measurement table (3)
Pin is overlapped with zero groove, fastens the measuring staff (4)；
Step 3：According to the scale on the measuring staff (4) and test arm (5), read and record respectively measuring staff (4) described in both sides and survey
Scale value X1 and X2 on arm (5)；
Step 4：Scale value X1 and X2 sum described in calculation procedure three on measuring staff (4) and the test arm (5), obtains step 2
Described in test point thickness value X；
Step 5：Repeat step two measures the thickness value X of all test points successively to step 4；
Step 6：The thickness value X of all test points described in step 5 arithmetic average is calculated, part wall thickness to be measured is obtained
Average value
Step 7：The measuring staff (4) is unclamped, wall thickness measuring device is taken out；
Step 8：The average value of part wall thickness to be measured according to step 6Selection thickness is the part wall thickness to be measured
Average valueStandard gauge block；
Step 9：Standard gauge block described in step 8 is put between the measuring staff (4), the measuring staff (4) is slided, rotates described
Gauge head (7), makes the gauge head (7) vertical with standard gauge block side, reads the scale on the measuring staff (4) and the test arm (5)
Number is designated as the average value of part wall thickness to be measured described in step 6
Step 10：The measurement table (3) dial plate is rotated, the measurement table (3) outer aperture needle is overlapped with zero groove, reads and remember
Record the measurement table (3) inner ring pointer value δ；
Step 11：Part wall thickness value Y to be measured is calculated, part wall thickness value Y to be measured meets following relation：
8. a kind of method for testing wall thickness as claimed in claim 7, it is characterised in that：The number of test point described in the step one
Amount at least 6.
9. a kind of method for testing wall thickness as claimed in claim 7, it is characterised in that：Test point described in the step one be with
The central axis of the part to be measured is what pivot was evenly arranged according to circumference array.
10. a kind of method for testing wall thickness as claimed in claim 7, it is characterised in that：Table depth is pressed described in the step 2
Value is less than 1 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710530065.0A CN107144205A (en) | 2017-07-03 | 2017-07-03 | A kind of wall thickness measuring device and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710530065.0A CN107144205A (en) | 2017-07-03 | 2017-07-03 | A kind of wall thickness measuring device and detection method |
Publications (1)
| Publication Number | Publication Date |
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| CN107144205A true CN107144205A (en) | 2017-09-08 |
Family
ID=59785760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710530065.0A Pending CN107144205A (en) | 2017-07-03 | 2017-07-03 | A kind of wall thickness measuring device and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945764A (en) * | 2019-05-06 | 2019-06-28 | 广西玉柴机器股份有限公司 | A kind of device measuring pipe wall thickness |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63177001A (en) * | 1987-01-19 | 1988-07-21 | Iijima Seimitsu Kogyo Kk | Apparatus for measuring cylindrical object |
| US5465498A (en) * | 1992-08-14 | 1995-11-14 | G.A.L. Gage Co. | Gauge for measuring the degree of alignment at the inner surfaces of two tubular members positioned end to end |
| CN204757878U (en) * | 2015-05-14 | 2015-11-11 | 营口埃斯威特阀门有限公司 | Check valve wall thickness check device |
| CN106441017A (en) * | 2016-10-27 | 2017-02-22 | 贵州安吉航空精密铸造有限责任公司 | Wax mould and casting wall thickness detection device used in investment precision casting |
-
2017
- 2017-07-03 CN CN201710530065.0A patent/CN107144205A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63177001A (en) * | 1987-01-19 | 1988-07-21 | Iijima Seimitsu Kogyo Kk | Apparatus for measuring cylindrical object |
| US5465498A (en) * | 1992-08-14 | 1995-11-14 | G.A.L. Gage Co. | Gauge for measuring the degree of alignment at the inner surfaces of two tubular members positioned end to end |
| CN204757878U (en) * | 2015-05-14 | 2015-11-11 | 营口埃斯威特阀门有限公司 | Check valve wall thickness check device |
| CN106441017A (en) * | 2016-10-27 | 2017-02-22 | 贵州安吉航空精密铸造有限责任公司 | Wax mould and casting wall thickness detection device used in investment precision casting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945764A (en) * | 2019-05-06 | 2019-06-28 | 广西玉柴机器股份有限公司 | A kind of device measuring pipe wall thickness |
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Application publication date: 20170908 |
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