CN113532346A - Measuring tool for measuring designated measuring point on height surface of blade root of turbine precision forging blade - Google Patents

Measuring tool for measuring designated measuring point on height surface of blade root of turbine precision forging blade Download PDF

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Publication number
CN113532346A
CN113532346A CN202010958055.9A CN202010958055A CN113532346A CN 113532346 A CN113532346 A CN 113532346A CN 202010958055 A CN202010958055 A CN 202010958055A CN 113532346 A CN113532346 A CN 113532346A
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China
Prior art keywords
measuring
blade
cylindrical section
hole
measuring plate
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CN202010958055.9A
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Chinese (zh)
Inventor
王成富
章奇
董欣欣
孔健
陆爱群
滕树新
潘利军
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Wuxi Turbine Blade Co Ltd
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Wuxi Turbine Blade Co Ltd
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Priority to CN202010958055.9A priority Critical patent/CN113532346A/en
Publication of CN113532346A publication Critical patent/CN113532346A/en
Pending legal-status Critical Current

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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
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

The invention provides a measuring tool for measuring an appointed measuring point on a height surface of a blade root of a turbine finish forging blade, which can solve the problems that the measuring precision of the height surface of the blade root of the turbine finish forging blade is not high by adopting a height gauge during the measurement, and the three-coordinate measurement can occupy the three-coordinate measurement capacity of an enterprise. The device comprises an inner arc measuring plate and a back arc measuring plate which are respectively arranged on two sides of the inner back of a finish forging blade and are arranged in a coplanar manner, wherein the inner arc measuring plate and the back arc measuring plate are arranged above the blade root height surface of the finish forging blade; under the natural state, the top end surface of the thimble is flush with the top end surface of the thimble sleeve assembly, and the lower end of the thimble extends out of the thimble sleeve assembly.

Description

Measuring tool for measuring designated measuring point on height surface of blade root of turbine precision forging blade
Technical Field
The invention relates to the field of processing and measuring of a turbine finish-forged blade, in particular to a measuring tool for measuring an appointed measuring point on a height surface of a blade root of the turbine finish-forged blade.
Background
For the turbine precision forging blade, during delivery, only the blade body profile and the blade root height surface of the blade are in a processing state, and other surfaces are in a blank state. For the detection of the blade body profile, a profile frame measuring tool is usually used to match with a profile measuring template for measurement, and for the detection of the blade root height surface, since the blade root height surface 1 is a circular arc surface, as shown in fig. 1 and fig. 2, the heights of four specified measuring points MP1, MP2, MP3 and MP4 on the blade root height surface relative to a reference point AP on the surface are usually measured, the former measuring method adopts either height gauge measurement or three-coordinate measuring center measurement, the former cannot accurately determine the positions of the specified measuring points, the measuring accuracy is not high, and the latter can occupy the productivity of enterprise three-coordinate measurement although the measuring accuracy is high.
Disclosure of Invention
The invention provides a measuring tool for measuring an appointed measuring point on a blade root height surface of a turbine finish forging blade, which can realize the accurate measurement of the height of the appointed measuring point on the blade root height surface relative to a reference point on the surface without using three-coordinate measurement, aiming at the technical problems that the measuring precision of a height gauge adopted in the measurement of the blade root height surface of the existing turbine finish forging blade is not high and the three-coordinate measurement can occupy the three-coordinate measurement capacity of an enterprise.
The technical scheme is as follows: the measuring tool for measuring the designated measuring point on the height surface of the blade root of the turbine finish forging blade is characterized in that: the device comprises an inner arc measuring plate and a back arc measuring plate which are respectively arranged on two sides of the inner back of a finish forging blade and are arranged in a coplanar manner, wherein the inner arc measuring plate and the back arc measuring plate are arranged above the blade root height surface of the finish forging blade, mounting holes are respectively formed in the inner arc measuring plate and the back arc measuring plate corresponding to specified measuring points and reference points on the blade root height surface, thimble sleeve assemblies are mounted in the mounting holes, thimbles capable of moving upwards are mounted in the thimble sleeve assemblies, and the lengths of the thimbles are designed according to the theoretical heights of the corresponding specified measuring points or reference points; under the natural state, the top end face of the ejector pin is flush with the top end face of the ejector pin sleeve assembly, and the lower end of the ejector pin extends out of the ejector pin sleeve assembly.
It is further characterized in that:
the thimble sleeve assembly comprises a fastening sleeve and a pin sleeve, the fastening sleeve is positioned above the inner arc measuring plate or the back arc measuring plate, and a first circular through hole, a second circular through hole and a threaded hole which are coaxially arranged are formed in the fastening sleeve from top to bottom; the pin bush comprises a thread section, a first cylindrical section and a second cylindrical section which are coaxially arranged from top to bottom, and the pin bush is provided with a central shaft hole; the first cylindrical section is inserted into the mounting hole in a matched mode, the threaded section is in threaded connection with the threaded hole, and the inner arc measuring plate or the back arc measuring plate is clamped between the fastening sleeve and the second cylindrical section; the thimble comprises a cylindrical section III, a step, a cylindrical section IV and a tip which are coaxially arranged from top to bottom, the cylindrical section III is in clearance fit with the circular through hole I, the step is in clearance fit with the circular through hole II, the cylindrical section IV is in clearance fit with the central shaft hole, the cylindrical section III is sleeved with a spring, the upper end of the spring is abutted against the top surface of the circular through hole II, the lower end of the spring is abutted against the top surface of the step, and the bottom surface of the step is abutted against the top end surface of the pin bush; the tip extends out of the pin sleeve.
The vertical distance between the bottom surface of the step and the tip of the tip is designed according to the upper tolerance of the theoretical height of the corresponding designated measuring point or reference point.
The invention has the beneficial effects that:
the invention relates to a measuring tool for measuring designated measuring points on a blade root height surface of a turbine finish-forged blade, which is provided with an inner arc measuring plate and a back arc measuring plate, wherein thimble sleeve assemblies and thimbles are respectively arranged on the inner arc measuring plate and the back arc measuring plate corresponding to four designated measuring points and reference points, when in measurement, the inner arc measuring plate and the back arc measuring plate are placed on a gear block of the profile frame measuring tool by means of the existing profile frame measuring tool, the turbine finish-forged blade is clamped on the profile frame measuring tool, the clamping height of the turbine finish-forged blade is adjusted until the thimble at the reference point in the measuring tool contacts the blade root height surface and the top end surface of the thimble is flush with the top end surface of the thimble sleeve assembly, the measuring state of the turbine finish-forged blade is adjusted in place, then the height values of the tops of the thimbles at the four designated measuring points, which protrude out of the top end surface of the thimble sleeve assembly, can be measured, namely the heights of the four designated measuring points relative to the reference points, whether the heights of four appointed measuring points of the blade can meet the requirements can be judged according to the measured convex height values, the measuring tool can accurately measure the relative heights of the appointed measuring points, and the three-coordinate productivity of an enterprise is effectively released; the measuring tool is convenient and quick to use, and the height surface of the blade root can be measured by a single person.
Drawings
FIG. 1 is a schematic representation of a turbine finish forged blade root height surface and the dimensions of designated measurement points and reference points on the surface;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a top view of the inner arc measurement plate and the back arc measurement plate of the present invention;
FIG. 4 is a schematic view of the thimble sleeve assembly and the thimble mounted at the mounting hole according to the present invention;
FIG. 5 is a front cross-sectional view of the clamping sleeve of the present invention;
FIG. 6 is a front cross-sectional view of the pin sleeve of the present invention;
FIG. 7 is a front view of the thimble of the present invention;
FIG. 8 is a schematic view of the present invention showing the use of the profile frame measuring device;
fig. 9 is an enlarged view of the area a in fig. 8.
Reference numerals: 1-root height plane; 2-inner arc measuring plate; 3-back arc measuring plate; 4-mounting holes; 5-a thimble; 6-fastening the sleeve; 7-pin sleeves; 8-a spring; 9-a profile frame measuring tool; 10-gear block; 11-precision forging of the blade; 51-cylindrical section three; 52-step; 53-cylindrical section four; 54-tip; 61-circular through hole one; 62-a circular through hole II; 63-a threaded hole; 71-a threaded segment; 72-cylindrical section one; 73-cylindrical section two; 74-central shaft hole.
Detailed Description
Referring to fig. 1 to 9, the measuring tool for measuring designated measuring points on the blade root height surface of the turbine finish-forged blade of the present invention includes an inner arc measuring plate 2 and a back arc measuring plate 3 which are respectively disposed on both sides of the inner back of the finish-forged blade and disposed coplanar, the inner arc measuring plate 2 and the back arc measuring plate 3 are disposed above the blade root height surface 1 of the finish-forged blade, mounting holes 4 are respectively disposed on the inner arc measuring plate 2 and the back arc measuring plate 3 corresponding to the designated measuring points MP1, MP2, MP3, MP4 and reference point AP on the blade root height surface 1, as shown in fig. 3, the mounting holes 4 on the inner arc measuring plate 2 sequentially correspond to the designated measuring points MP1, reference point AP and designated measuring point MP3 from left to right, and the mounting holes 4 on the back arc measuring plate 3 sequentially correspond to the designated measuring points MP2 and MP4 from left to right; a thimble sleeve assembly is arranged in the mounting hole 4, a thimble 5 capable of moving upwards is arranged in the thimble sleeve assembly, and the length of the thimble 5 is designed according to the theoretical height of corresponding designated measuring points MP1, MP2, MP3, MP4 or a reference point AP; in a natural state, the top end surface of the thimble 5 is flush with the top end surface of the thimble sleeve assembly, and the lower end of the thimble 5 extends out of the thimble sleeve assembly.
Referring to fig. 4 to 7, the thimble sleeve assembly comprises a fastening sleeve 6 and a pin bush 7, the fastening sleeve 6 is positioned above the inner arc measuring plate 2 or the back arc measuring plate 3, and the fastening sleeve 6 is provided with a first circular through hole 61, a second circular through hole 62 and a threaded hole 63 which are coaxially arranged from top to bottom; the pin bush 7 comprises a threaded section 71, a first cylindrical section 72 and a second cylindrical section 73 which are coaxially arranged from top to bottom, and the pin bush 7 is provided with a central shaft hole 74; the first cylindrical section 72 is inserted into the mounting hole 4 in a matching manner, and the threaded section 71 is in threaded connection with the threaded hole 63, so that the inner arc measuring plate 2 or the back arc measuring plate 3 is clamped between the fastening sleeve 6 and the second cylindrical section 73; the thimble 5 comprises a third cylindrical section 51, a step 52, a fourth cylindrical section 53 and a tip 54 which are coaxially arranged from top to bottom, wherein the third cylindrical section 51 is in clearance fit with the first circular through hole 61, the step 52 is in clearance fit with the second circular through hole 62, the fourth cylindrical section 53 is in clearance fit with the central shaft hole 74, the third cylindrical section 51 is sleeved with a spring 8, the upper end of the spring 8 is abutted against the top surface of the second circular through hole 62, the lower end of the spring 8 is abutted against the top surface of the step 52, and the bottom surface of the step 52 is abutted against the top end surface of the pin bush 7; the tip 54 protrudes out of the pin bush 7. During installation, the spring 8 is sleeved on the third cylindrical section 51 of the ejector pin 5, the ejector pin 5 and the spring 8 are installed into the fastening sleeve 6 together, the mounting hole 4 is penetrated, the pin sleeve 7 is screwed finally, after the pin sleeve 7 is screwed, the bottom surface of the step 52 is abutted against the top end surface of the pin sleeve 7 under the action of the spring 8, and then the top surfaces of the fastening sleeve 6 and the ejector pin 5 are flattened.
In order to ensure that the ejector pins at four appointed measuring points can protrude out of the fastening sleeve after the measuring state of the turbine precision forging blade is adjusted in place, the vertical distance C between the bottom surface of the step 52 and the tip of the tip 54 is designed according to the upper tolerance of the theoretical height of the corresponding appointed measuring point or reference point, and the total length B of the ejector pin 5 is also designed according to the upper tolerance of the theoretical height of the corresponding appointed measuring point or reference point. For example, the theoretical height of the reference point AP is 38.6mm, the theoretical height of the designated measurement point MP1 is 39.6. + -. 0.65mm, the theoretical height of the designated measurement point MP2 is 42. + -. 0.65mm, and the theoretical height of the designated measurement point MP3 is 48.7 mm-0.65 0And the theoretical height of the designated measurement point MP4 is 36.6 +/-0.65 mm, and the C value and the B value of the thimble at each designated measurement point and the reference point are designed according to the following formula, which is specifically shown in Table 1.
Wherein, the C value = theoretical height of each point + upper tolerance + a; b value = C value + B; a and b are constants, and in Table 1, a is 11mm and b is 16.5 mm.
TABLE 1 design of C and B values of thimble at each designated measurement point and reference point
Figure 401562DEST_PATH_IMAGE002
The following describes in detail the process of measuring the designated measuring point on the height surface of the blade root of the turbine finish-forged blade by using the measuring tool of the present invention: the inner arc measuring plate 2 and the back arc measuring plate 3 are placed on a gear block 10 of a profile frame measuring tool 9, a steam turbine finish forging blade 11 is clamped on the profile frame measuring tool 9, the clamping height of the steam turbine finish forging blade 11 is adjusted until a thimble 5 at a reference point AP in the measuring tool contacts a blade root height surface 1 and the top end surface of the thimble 5 is flush with the top end surface of a fastening sleeve 6, at the moment, the measuring state of the steam turbine finish forging blade 11 is adjusted in place, and then height values of top parts of thimbles 5 at four appointed measuring points MP1, MP2, MP3 and MP4, which protrude out of the top end surface of the fastening sleeve 6, are measured respectively, namely the heights of the four appointed measuring points relative to the reference point.

Claims (3)

1. The measuring tool for measuring the designated measuring point on the height surface of the blade root of the turbine finish forging blade is characterized in that: the device comprises an inner arc measuring plate and a back arc measuring plate which are respectively arranged on two sides of the inner back of a finish forging blade and are arranged in a coplanar manner, wherein the inner arc measuring plate and the back arc measuring plate are arranged above the blade root height surface of the finish forging blade, mounting holes are respectively formed in the inner arc measuring plate and the back arc measuring plate corresponding to specified measuring points and reference points on the blade root height surface, thimble sleeve assemblies are mounted in the mounting holes, thimbles capable of moving upwards are mounted in the thimble sleeve assemblies, and the lengths of the thimbles are designed according to the theoretical heights of the corresponding specified measuring points or reference points; under the natural state, the top end face of the ejector pin is flush with the top end face of the ejector pin sleeve assembly, and the lower end of the ejector pin extends out of the ejector pin sleeve assembly.
2. The measuring tool for measuring the designated measuring point on the height surface of the root of the turbine finish forged blade according to claim 1, wherein: the thimble sleeve assembly comprises a fastening sleeve and a pin sleeve, the fastening sleeve is positioned above the inner arc measuring plate or the back arc measuring plate, and a first circular through hole, a second circular through hole and a threaded hole which are coaxially arranged are formed in the fastening sleeve from top to bottom; the pin bush comprises a thread section, a first cylindrical section and a second cylindrical section which are coaxially arranged from top to bottom, and the pin bush is provided with a central shaft hole; the first cylindrical section is inserted into the mounting hole in a matched mode, the threaded section is in threaded connection with the threaded hole, and the inner arc measuring plate or the back arc measuring plate is clamped between the fastening sleeve and the second cylindrical section; the thimble comprises a cylindrical section III, a step, a cylindrical section IV and a tip which are coaxially arranged from top to bottom, the cylindrical section III is in clearance fit with the circular through hole I, the step is in clearance fit with the circular through hole II, the cylindrical section IV is in clearance fit with the central shaft hole, the cylindrical section III is sleeved with a spring, the upper end of the spring is abutted against the top surface of the circular through hole II, the lower end of the spring is abutted against the top surface of the step, and the bottom surface of the step is abutted against the top end surface of the pin bush; the tip extends out of the pin sleeve.
3. The measuring tool for measuring the designated measuring point on the height surface of the root of the turbine finish forged blade according to claim 2, wherein: the vertical distance between the bottom surface of the step and the tip of the tip is designed according to the upper tolerance of the theoretical height of the corresponding designated measuring point or reference point.
CN202010958055.9A 2020-09-14 2020-09-14 Measuring tool for measuring designated measuring point on height surface of blade root of turbine precision forging blade Pending CN113532346A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010958055.9A CN113532346A (en) 2020-09-14 2020-09-14 Measuring tool for measuring designated measuring point on height surface of blade root of turbine precision forging blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010958055.9A CN113532346A (en) 2020-09-14 2020-09-14 Measuring tool for measuring designated measuring point on height surface of blade root of turbine precision forging blade

Publications (1)

Publication Number Publication Date
CN113532346A true CN113532346A (en) 2021-10-22

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