CN115319539A - Thickness measuring tool and method for disc with wall thickness having inclined angle on given diameter - Google Patents
Thickness measuring tool and method for disc with wall thickness having inclined angle on given diameter Download PDFInfo
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- CN115319539A CN115319539A CN202210896921.5A CN202210896921A CN115319539A CN 115319539 A CN115319539 A CN 115319539A CN 202210896921 A CN202210896921 A CN 202210896921A CN 115319539 A CN115319539 A CN 115319539A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/20—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring workpiece characteristics, e.g. contour, dimension, hardness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B25/00—Accessories or auxiliary equipment for turning-machines
- B23B25/06—Measuring, gauging, or adjusting equipment on turning-machines for setting-on, feeding, controlling, or monitoring the cutting tools or work
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention discloses a thickness measuring tool for a disc with an inclined angle on a wall thickness on a given diameter, which comprises a main body, a fixed supporting frame, a micrometer indicator, a movable supporting frame and a ball head measuring pin, wherein the main body comprises a Y-shaped frame and a containing groove, the Y-shaped frame is used for being placed across the excircle of the disc, the containing groove is arranged in the middle of the Y-shaped frame, the fixed supporting frame and the movable supporting frame are respectively arranged on two sides of the main body, a fixing unit used for fixing the position of the movable supporting frame when the movable supporting frame is contained in the containing groove is arranged in the containing groove, the micrometer indicator is arranged on the free end of the movable supporting frame, the ball head measuring pin is arranged at the tail end of the fixed supporting frame, and the ball head of the ball head measuring pin and the gauge head of the micrometer indicator are respectively contacted with the front side surface and the back side surface of the disc; the invention also discloses a measuring method comprising the measuring tool. The invention can solve the technical problems of low efficiency, low precision, inconvenient use and high cost of the existing measurement by adopting a three-coordinate measuring instrument.
Description
Technical Field
The invention relates to the technical field of aeroengine turbine membrane discs, in particular to a thickness measuring tool for a disc with a wall thickness having an inclination angle on a given diameter. The invention also relates to a method for measuring the thickness of the disc with the wall thickness inclined angle on a given diameter.
Background
The turbine membrane disc of the aircraft engine is one of the most important components and the components with the highest precision of engine transmission, and the precision of the membrane disc directly influences the vibration of the engine, so that the performance and the service life of the engine are influenced. The qualification rate of the thickness of the discs at two ends of the membrane disc on a given diameter is always the most important factor influencing the whole qualification rate of the membrane disc, and the qualification rate is usually below 20 percent; and the processing efficiency at the thickness on the given diameter is also the most important factor which most influences the overall processing efficiency of the membrane disc, and the processing time at the thickness on the given diameter accounts for more than 80 percent of the overall processing time. In the past, because the thicknesses of the disks at two ends of the membrane disk on a plurality of given diameters need to be measured, a large amount of time is consumed, the thickness accounts for about 65% of the whole processing time, after the thickness needs to be roughly processed, an actual value of the thickness after rough processing is measured, a cutter compensating value is calculated according to the actual value, then finish processing is carried out, a workpiece needs to be detached from a machine tool during measurement, and the qualification rate is further influenced.
The structural form of the discs at two ends of the membrane disc is that the thickness direction has an angle and the thickness changes linearly, the measurement of the thickness on a given diameter generally means that the thickness H at the position of the given diameter phi A is measured under the condition that the diameter phi D of the excircle of the disc is known and two inclination angles alpha degrees and beta degrees on the front side surface and the back side surface of the disc respectively in the thickness direction of the disc are known, and the conventional measurement method of the H usually adopts a three-coordinate measuring instrument for measurement, namely: a reference bottom surface is required to be found from the workpiece, at least 16 points are punched, and a datum of the three-coordinate measuring instrument is formed; then at least 16 points are punched from the excircle phi D of the workpiece to form another datum of the three-coordinate measuring instrument; based on the two references found above, at least 32 points are punched on the front and back sides of the diameter phi A in total, the thickness H is measured, and the maximum value and the minimum value are found out. The following disadvantages exist in the measurement with a three-coordinate measuring machine: (1) low efficiency: the three-coordinate measuring instrument needs to print at least 64 points to measure the required value, and the time is at least more than 20 minutes; (2) low precision: the measurement precision is influenced by the position precision of the reference surface and the measured value position, and if only 16 points are taken as the measurement points in the three-coordinate measurement, the measurement points can only reflect the size of the measured 16 points and do not truly and continuously obtain the maximum value and the minimum value of a whole circle; (3) inconvenient use: when the device is used, a workpiece needs to be placed on a three-coordinate worktable for measurement, and the device cannot be used when the workpiece is still arranged on a machine tool; (4) high cost: three-coordinate is almost the most costly measurement method in a factory because its equipment is very expensive to purchase and maintain.
Therefore, there is a need for a measuring tool and a measuring method that are accurate, quick, and convenient (capable of measuring without removing the workpiece from the machine tool).
Disclosure of Invention
The invention provides a thickness measuring tool and a thickness measuring method for a disc with a wall thickness having an inclination angle on a given diameter, and aims to solve the technical problems of low efficiency, low precision, inconvenience in use and high cost in the existing measurement by adopting a three-coordinate measuring instrument.
According to one aspect of the invention, a thickness measuring tool for a disc with a wall thickness having an inclination angle on a given diameter is provided, which comprises a main body, a fixed support frame, a dial indicator, a movable support frame and a ball head measuring pin, wherein the main body comprises a Y-shaped frame used for straddling on the excircle of the disc and a containing groove arranged in the middle of the Y-shaped frame, the Y-shaped frame comprises a V-shaped structure straddling on the excircle of the disc and a connecting structure arranged at the turning position of the V-shaped structure, the opening angle of the V-shaped structure is gamma, the fixed support frame and the movable support frame are respectively arranged at two sides of the main body, the fixed support frame is detachably connected and fixed with a first side surface of the connecting structure, the movable support frame comprises a fixed end connected with the main body and a free end rotating around the fixed end, the fixed end of the movable supporting frame is fixedly connected with the second side face of the connecting structure in a rotatable connection mode, the width of the movable supporting frame is not larger than that of the accommodating groove, the movable supporting frame rotates by taking the joint of the movable supporting frame and the connecting structure as a hinge point and is accommodated in the accommodating groove, a fixing unit for fixing the position of the movable supporting frame when the movable supporting frame is accommodated in the accommodating groove is arranged in the accommodating groove, the dial indicator is arranged on the free end of the movable supporting frame, the ball head measuring pin is arranged on the non-connecting end of the fixed supporting frame, and the ball head of the ball head measuring pin and the gauge head of the dial indicator are respectively used for being in contact with the front side face and the back side face of the disc.
Further, the fixing unit comprises a long square head screw, the screw part of the long square head screw is fixed in a threaded hole in the accommodating groove, a fixing groove for the head of the long square head screw to penetrate out is formed in the movable supporting frame, the width of the fixing groove is larger than the width of the head of the long square head screw, the width of the fixing groove is smaller than the length of the head of the long square head screw, and the head of the long square head screw penetrates out of the fixing groove and is tightly fixed on the outer surface of the movable supporting frame so that the movable supporting frame is tightly pressed and accommodated in the accommodating groove.
Further, the main body is provided with a measuring tool reference hole, and the distance B1 from the center of the dial indicator to the measuring tool reference hole is equal to B-phi A/2-phi D1 sin beta/2, wherein: b is a distance value from the measuring tool reference hole to the center of the disc, phi A is a diameter value on a given diameter on the disc, phi D1 is a diameter value of a gauge head of the dial indicator, and beta is an inclination angle in the thickness direction of the side face of the disc contacted with the gauge head of the dial indicator; the distance B2 from the center of the ball head measuring pin to the measuring tool reference hole is equal to B-phi A/2-phi D2 sin alpha/2, wherein: b is a distance value from the measuring tool reference hole to the center of the disc, phi A is a diameter value on a given diameter on the disc, phi D2 is a diameter value of a ball head of the ball head measuring pin, and alpha is an inclination angle in the thickness direction of the side face of the disc, which is in contact with the ball head of the ball head measuring pin.
Further, the ball head of the ball head measuring pin is asymmetric with the gauge head of the dial indicator.
According to another aspect of the present invention, there is provided a method for measuring the thickness of a disk having a wall thickness inclined at a given diameter, comprising the steps of:
s1, manufacturing a standard part: manufacturing a standard part, wherein the structural standard and the measured position of the standard part are consistent with the workpiece to be measured, the standard part is manufactured according to the size of the workpiece to be measured on a design drawing, a point D3 on the excircle of the standard part is taken, a thickness true value H3 on a given diameter phi A of the standard part is measured by a three-coordinate measuring instrument, a diameter true value phi D3 at the position D3 is measured, the values of H3 and phi D3 are recorded, and the values are engraved on the standard part;
s2, opening the measuring tool and calibrating the measuring tool: opening the measuring tool, enabling the V-shaped structure of the measuring tool main body to straddle at a point D3 on the standard component, enabling a ball head of the ball head measuring pin to contact the standard component, closing the measuring tool, adjusting the fixing unit to enable the movable supporting frame to be in a stable accommodating state, adjusting the dial indicator to enable a gauge head of the dial indicator to contact the standard component and be in a gauge pressing state, and adjusting a dial of the dial indicator to return to zero;
s3, measuring the workpiece to be measured by using the measuring tool: opening the measuring tool, enabling the V-shaped structure of the measuring tool main body to span a D point on the excircle of a workpiece to be measured, measuring a diameter value phi D of the D point by using the diameter measuring tool, enabling a ball head of a ball head measuring pin to contact the workpiece to be measured, closing the measuring tool, adjusting a fixing unit to enable a movable supporting frame to be in a stable accommodating state, fixing the measuring tool and enabling the workpiece to be measured to rotate for one circle, and reading out a maximum value E1 and a minimum value E2 of a pointer on a dial indicator during rotation;
s4, calculating the thickness value range: calculating a minimum thickness value H1 and a maximum thickness value H2 on a given diameter phi A on the workpiece to be measured according to the following formula, wherein H1= H3+ E2+1/2 (tan alpha + tan beta) (phi D3-phi D)/sin (gamma/2), H2= H3+ E1+1/2 (tan alpha + tan beta) (phi D3-phi D)/sin (gamma/2), alpha and beta are respectively inclined angle values existing on the front surface and the back surface of the workpiece to be measured, and gamma is an opening angle of a V-shaped structure of the measuring tool body;
s5, judging whether the processing of the workpiece to be detected is qualified: comparing the range of H1-H2 with the allowable range value of the workpiece to be measured, judging whether the thickness of the workpiece to be measured on the given diameter is qualified or not, if H1-H2 is in the allowable range of the workpiece to be measured, the thickness of the workpiece to be measured on the given diameter is qualified, and if H1-H2 is not in the allowable range of the workpiece to be measured or is overlapped with the allowable range of the workpiece to be measured, the thickness of the workpiece to be measured on the given diameter is unqualified;
s6, carrying out qualification detection on workpieces to be detected in batches: and repeating the steps S3 to S5 every time when one workpiece to be measured is replaced for measurement.
Further, in the step S1, after the standard component is manufactured, two scribed lines are respectively scribed at the same positions on the front surface and the back surface of the standard component, the two scribed lines are axisymmetric with respect to a connecting line between the point D3 and the center of the disc, and the thickness measurement point with the given diameter Φ a is located on the connecting line between the point D3 and the center of the disc.
Further, the distance between the two scribed lines on the same side of the standard piece is 8-12 mm.
Further, in the step S1, the standard component is in a non-full-circle structure, the standard component is a structure formed by cutting and intercepting a part with higher precision after the disk of the full-circle structure manufactured according to the design drawing of the workpiece to be measured is manufactured, and the cutting and intercepting part includes a structure at the center of the circle of the disk and 1/6 structure more than the full circle along the center of the circle.
Further, in the step S2, a contact point between the ball of the ball measuring pin and the standard component is located within the range of the two scribed lines.
Further, in the step S3, in the process of measuring the workpiece to be measured by using the measuring tool, the workpiece to be measured is always mounted on the machine tool.
The invention has the following beneficial effects:
(1) The measuring tool comprises a main body, a fixed supporting frame, a dial indicator, a movable supporting frame and a ball head measuring pin, wherein a V-shaped structure on the main body is arranged on the excircle of a disc of a workpiece to be measured in a spanning mode: firstly, a V-shaped mechanism is spanned on a workpiece to be measured, the workpiece to be measured is adjusted to enable a ball head of a ball head measuring pin to be abutted against a position to be measured of the workpiece to be measured, then a movable supporting frame is clamped in a containing groove, so that a gauge head of a dial indicator and the ball head of the ball head measuring pin are oppositely clamped on the front side and the back side of the workpiece to be measured, the position of a measuring tool is fixed by reasonably arranging the position of the gauge head of the dial indicator on the movable supporting frame and the position of the ball head measuring pin on a fixed supporting frame, the ball head of the ball head measuring pin and the gauge head of the dial indicator are respectively contacted on the given diameter phi A of the front side and the back side of the workpiece to be measured, a disc of the workpiece to be measured is rotated, the measuring tool provided by the invention has the advantages that the real and continuous maximum value and minimum value of a whole circle can be measured by rotating the disc of the workpiece to be measured, the measuring precision is not influenced by the position precision of the obtained reference surface and the position of the measured value, and the precision is higher; in addition, the measuring tool has the advantages of simple structure, low manufacturing difficulty, low manufacturing cost and simple later maintenance, so that the whole measuring cost is low;
(2) The measuring tool only comprises a main body, a fixed supporting frame, a dial indicator, a movable supporting frame and a ball head measuring pin, has small volume and light weight, can be used in various occasions, and has wide application range;
(3) The measuring method uses the measuring tool of the invention, firstly a standard part with the structure standard and the measured position consistent with the workpiece to be measured is manufactured, firstly the measuring tool is calibrated through the standard part, then the measuring tool is used for measuring, a thickness range value on the appointed given diameter phi A is obtained by using the measuring tool and a calculation formula, whether the processing of the thickness of the workpiece to be measured on the given diameter is qualified or not is judged according to the range value, dotting is not needed in the measuring process, the workpiece to be measured is not needed to be detached from a machine tool, one workpiece to be measured is measured for no more than 1 minute, the qualified rate of the thickness of the workpiece to be measured on the given diameter can be detected in batch, the measuring method has the advantages of high measuring efficiency and convenience in use, and the processing efficiency of the engine membrane disc is greatly improved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a perspective view of a thickness gauge for a disk of the preferred embodiment of the present invention having a wall thickness with an oblique angle for a given diameter;
FIG. 2 is a schematic structural view of a thickness measuring tool of a disc with a wall thickness having an inclination angle in a given diameter on a workpiece to be measured and in a closed state according to a preferred embodiment of the present invention;
FIG. 3 is a schematic structural view of a thickness measuring tool of a disk with a wall thickness having an inclination angle in a given diameter on a workpiece to be measured and in an open state according to a preferred embodiment of the present invention;
FIG. 4 is a right side view of FIG. 2;
FIG. 5 is a front view of FIG. 2;
FIG. 6 is a left side view of FIG. 2;
FIG. 7 is a schematic structural view of a standard component of the preferred embodiment of the present invention;
fig. 8 is a side view of fig. 7.
Illustration of the drawings:
1. a main body; 11. a Y-shaped frame; 12. a receiving groove; 13. measuring a reference hole of the tool; 2. fixing the supporting frame; 3. a dial indicator; 4. a movable support frame; 41. fixing grooves; 5. a ball head measuring pin; 6. a fixing unit; 7. a standard component; 8. a workpiece to be tested; 9. two score lines.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
As shown in fig. 1-6, the thickness measuring device for a disc with a wall thickness having an inclination angle on a given diameter in the present embodiment includes a main body 1, a fixed support frame 2, a dial indicator 3, a movable support frame 4 and a ball measuring pin 5, wherein the main body 1 includes a Y-shaped frame 11 for straddling an outer circle of the disc and a receiving groove 12 disposed in the middle of the Y-shaped frame 11, the Y-shaped frame 11 includes a V-shaped structure straddling the outer circle of the disc and a connecting structure disposed at a turning point of the V-shaped structure, an opening angle of the V-shaped structure is γ, the fixed support frame 2 and the movable support frame 4 are respectively disposed at both sides of the main body 1, the fixed support frame 2 is fixedly connected to a first side of the connecting structure by a screw and a pin, the movable support frame 4 includes a fixed end connected to the main body 1 and a free end rotating around the fixed end, the fixed end of the movable support frame 4 is fixedly connected to a second side of the connecting structure by a hinge assembly, a width of the movable support frame 4 is not greater than a width of the receiving groove 12, the movable support frame 4 is rotatably disposed in the receiving groove 12 with a connecting point of the dial indicator 4, the movable support frame 4 and the ball measuring pin assembly is disposed on the receiving groove 3, the connecting end of the dial indicator 4 and the ball measuring unit for contacting the ball measuring pin 5, and the measuring unit for contacting the movable support frame 4, the ball measuring pin 5, and the measuring pin 5.
The measuring tool comprises a main body 1, a fixed supporting frame 2, a dial indicator 3, a movable supporting frame 4 and a ball head measuring pin 5, wherein only a V-shaped structure on the main body 1 needs to be arranged on an excircle of a disc of a workpiece 8 to be measured in a spanning mode, the ball head of the dial indicator 3 is in reasonable arrangement with the position on the movable supporting frame 4 and the position on the fixed supporting frame 2 through the position of a gauge head on the ball head measuring pin 3 and the position of a ball head of the ball head measuring pin 5, the ball head of the ball head measuring pin 5 and the gauge head of the dial indicator 3 are respectively contacted with a given diameter phi A of the front surface and the back surface of the workpiece 8 to be measured, the position of the measuring tool is fixed, the disc of the workpiece 8 to be measured is rotated, the maximum value and the minimum value of a pointer of the dial indicator 3 are read, a thickness range value on the given diameter A is calculated through a formula, whether the thickness of the workpiece 8 to be measured on the given diameter is qualified or not to be measured according to the range value, the measuring tool does not need to be dotted in a dotting process, the workpiece 8 to be measured, the measuring tool can be measured, the maximum value and the position and the accuracy of the measured can be measured continuously measured without being influenced by the maximum value and the reference position of the measured value and the reference value; in addition, the measuring tool of the embodiment has the advantages of simple structure, low manufacturing difficulty, low manufacturing cost and simple later maintenance, so that the whole measuring cost is low; the measuring tool of the embodiment only comprises a main body 1, a fixed supporting frame 2, a dial indicator 3, a movable supporting frame 4 and a ball head measuring pin 5, has small volume and light weight, can be used in various occasions, and has wide application range.
In this embodiment, the fixing unit 6 includes a rectangular head screw, a screw portion of the rectangular head screw is fixed in a screw hole in the accommodating groove, the movable supporting frame 4 is provided with a fixing groove 41 through which a head of the rectangular head screw penetrates, a width of the fixing groove 41 is greater than a width of the head of the rectangular head screw, the width of the fixing groove 41 is less than a length of the head of the rectangular head screw, and the head of the rectangular head screw penetrates through the fixing groove 41 and is closely fixed on an outer surface of the movable supporting frame 4, so that the movable supporting frame 4 is compressed and accommodated in the accommodating groove 12. The fixing unit 6 is used as follows: if the movable supporting frame 4 needs to be opened, the head of the long square head screw is held by a hand to rotate the screw part of the long square head screw, and when the head of the long square head screw is completely in the size range of the fixed groove 41, the head of the long square head screw can be separated from the fixed groove 41, and at this time, the movable supporting frame 4 can be opened from the accommodating groove 12, so that the measuring tool can be conveniently taken down from the workpiece.
In this embodiment, the main body 1 is provided with a measuring tool reference hole 13, and a distance B1 from the center of the dial indicator 3 to the measuring tool reference hole 13 is equal to B- Φ a/2- Φ D1 × sin β/2, where: b is a distance value from the measuring tool reference hole 13 to the center of the disc, phi A is a diameter value on a given diameter on the disc, phi D1 is a diameter value of a gauge head of the dial indicator 3, and beta is an inclination angle in the thickness direction of the side face of the disc contacted with the gauge head of the dial indicator 3; the distance B2 from the center of the ball head measuring pin 5 to the measuring tool reference hole 13 is equal to B-phi A/2-phi D2 sin alpha/2, wherein: b is the distance value from the measuring tool reference hole 13 to the center of the disc, phi A is the diameter value on the given diameter of the disc, phi D2 is the diameter value of the ball head measuring pin 5, and alpha is the inclination angle in the thickness direction of the side face of the disc contacted with the ball head of the ball head measuring pin 5. And B1 and B2 are designed, in order to enable the ball head of the ball head measuring pin 5 and the ball head of the dial indicator 3 to be just in contact with the specified diameter of the workpiece 8 to be measured, the values of B1 and B2 are obtained according to geometric calculation, and the dial indicator 3 and the ball head measuring pin 5 are arranged in order to ensure that the size design of the measuring tool meets the use requirement of the measuring tool for quickly measuring the thickness of a disc with an inclined angle of the wall thickness on the specified diameter.
In this embodiment, the ball of the ball measuring pin 5 is asymmetric with the gauge head of the dial indicator 3.
As shown in fig. 1-8, according to another aspect of the present embodiment, there is provided a method for measuring the thickness of a disk with a wall thickness inclined at a given diameter, comprising the steps of:
s1, manufacturing a standard part: manufacturing a standard piece 7, wherein the structural standard and the measured position of the standard piece 7 are consistent with a workpiece 8 to be measured, the standard piece 7 is manufactured according to the size of the design drawing of the workpiece 8 to be measured (including angles alpha and beta of the processing positions on the front and back surfaces of the standard piece 7, and alpha and beta are processed by a numerical control lathe), each parameter of the standard piece 7 can be almost the same as each parameter of the workpiece 8 to be measured, one point D3 on the excircle of the standard piece 7 is taken, a three-coordinate measuring instrument is used for measuring a thickness true value H3 on a given diameter phi A of the standard piece 7, the measuring process of the thickness true value H3 on the given diameter phi A is consistent with the measuring process of the existing three-coordinate measuring instrument, because the standard piece 7 is used as a reference standard, only one time is needed to measure the value of H3 and is carved on the standard piece 7, repeated measurement is not needed, the measuring does not affect the measuring efficiency of the measurement of the workpiece 8 to be measured, the diameter true value D3, the values of H3 and the phi D3 and the phi D3 and the subsequent values are carved on the standard piece 7, and the measured values of the workpiece 8 can be recorded without the measured values of each other, and the measured values of the two workpieces to be measured, and the measured values of the workpiece 8, and the two workpieces can be recorded once again;
s2, opening the measuring tool and calibrating the measuring tool: opening the measuring tool, enabling the V-shaped structure of the main body 1 of the measuring tool to straddle a point D3 on the standard part 7, enabling the ball head of the ball head measuring pin 5 to contact the standard part 7, closing the measuring tool, adjusting the fixing unit 6 to enable the movable supporting frame 4 to be in a stable accommodating state, adjusting the dial indicator to enable the gauge head of the dial indicator 3 to contact the standard part and be in a gauge pressing state, adjusting the dial of the dial indicator 3 to return to zero, and completing calibration of the measuring tool;
s3, measuring the workpiece 8 to be measured by using the measuring tool: opening the measuring tool, enabling the V-shaped structure of the measuring tool main body 1 to span a D point on the excircle of the workpiece 8 to be measured, directly clamping a micrometer on a disc of the workpiece 8 to be measured to measure a diameter value phi D of the D point, enabling a ball head of a ball head measuring pin 5 to contact the workpiece 8 to be measured, closing the measuring tool, adjusting a fixing unit 6 to enable a movable supporting frame 4 to be in a stable storage state, rotating the workpiece 8 to be measured for one circle by using a hand measuring tool, and reading out a maximum value E1 and a minimum value E2 of a pointer on a dial indicator 3 in the rotating process;
s4, calculating a thickness value range: calculating a minimum thickness value H1 and a maximum thickness value H2 on a given diameter PhIA of the workpiece to be measured according to the following formula, wherein H1= H3+ E2+1/2 (tan alpha + tan beta) (PhiD 3-PhiD)/sin (gamma/2), and H2= H3+ E1+1/2 (tan alpha + tan beta) (PhiD 3-PhiD)/sin (gamma/2), wherein alpha and beta are respectively inclined angle values existing on the front surface and the back surface of the workpiece 8 to be measured, and gamma is an opening angle of a V-shaped structure of the measuring tool body 1;
s5, judging whether the machining of the workpiece 8 to be measured is qualified: comparing the range of H1-H2 with the range value allowed by the workpiece 8 to be measured, judging whether the thickness of the workpiece 8 to be measured on the given diameter is qualified or not, if H1-H2 is in the range allowed by the workpiece 8 to be measured, the thickness of the workpiece 8 to be measured on the given diameter is qualified, and if H1-H2 is not in the range allowed by the workpiece 8 to be measured or is overlapped with the range allowed by the workpiece 8 to be measured, the thickness of the workpiece 8 to be measured on the given diameter is unqualified;
s6, carrying out qualification detection on the workpieces to be detected 8 in batches: and repeating the steps S3 to S5 when each workpiece 8 to be measured is replaced for measurement.
In this embodiment, in step S1, after the standard part 7 is manufactured, two scribe lines 9 are respectively scribed at the same positions on the front and back surfaces of the standard part 7, the two scribe lines 9 are axisymmetric with respect to a connecting line between the point D3 and the center of the disk, and the thickness measurement point with the given diameter Φ a is located on the connecting line between the point D3 and the center of the disk. The distance between two scribed lines 9 on the same side of the standard 7 is 8-12 mm, a distance between two scribed lines 9 of less than 8mm can result in an awkward measurement procedure, and a distance between two scribed lines 9 of more than 12mm can result in a loss of measurement accuracy. The purpose of the two score lines 9 is to make the H3 value more accurate, both score lines being able to narrow the range of H3 maxima and minima over a full circle of a given diameter phia.
In this embodiment, in step S1, the shape of the standard component 7 is preferably a non-full-circle structure, the standard component 7 is a structure formed by cutting and intercepting a part with higher precision after the disk of the full-circle structure manufactured according to the design drawing of the workpiece to be measured is manufactured, and the cut and intercepted part includes a structure at the center of the disk and 1/6 structure more than the full circle along the center of the disk. In other embodiments, the standard component 7 may be made into a round shape, in this embodiment, the standard component 7 is made into a non-round structure (three sides are linear, one side is an arc structure), on one hand, a portion with the highest precision can be extracted, on the other hand, the standard component 7 is more favorable for being vertically placed on a horizontal desktop, and is convenient to use, the workpiece 8 to be measured is generally used in processing by a horizontal lathe, the workpiece is horizontally placed in processing, the placement angle of the standard component is consistent with the placement angle of the workpiece 8 to be measured when being measured, and the measurement error of an operator caused by the horizontal height is favorably reduced.
In this embodiment, in step S2, a contact point between the ball of the ball head measuring pin 5 and the standard component 7 is located within two scribed lines 9, the most precise part of the standard component 7 is taken within the two scribed lines 9, the processing difficulty of the standard component 7 can be reduced by providing the two scribed lines 9, and it is not necessary to process each part of the whole standard component 7 very precisely.
In this embodiment, in step S3, in the process of measuring the workpiece 8 to be measured by using the measuring tool, the workpiece 8 to be measured is always mounted on the machine tool, and the workpiece 8 to be measured does not need to be detached from the machine tool in the measuring process, so that the qualification rate is not affected, and the method has the characteristic of convenience in use.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A thickness measuring tool for a disc with a wall thickness having an inclination angle on a given diameter is characterized by comprising a main body (1), a fixed supporting frame (2), a dial indicator (3), a movable supporting frame (4) and a ball head measuring pin (5),
the main body (1) comprises a Y-shaped frame (11) used for striding over the excircle of the disc and a containing groove (12) arranged in the middle of the Y-shaped frame (11), the Y-shaped frame (11) comprises a V-shaped structure striding over the excircle of the disc and a connecting structure arranged at the turning part of the V-shaped structure, the fixed supporting frame (2) and the movable supporting frame (4) are respectively arranged at two sides of the main body (1), the fixed supporting frame (2) is connected and fixed with a first side surface of the connecting structure in a detachable mode,
the movable supporting frame (4) comprises a fixed end connected with the main body (1) and a free end rotating around the fixed end, the fixed end of the movable supporting frame (4) is fixedly connected with the second side of the connecting structure in a rotatable connection mode, the movable supporting frame (4) rotates by taking the connection part of the movable supporting frame and the connecting structure as a hinge point to be accommodated in the accommodating groove (12),
a fixing unit (6) for fixing the position of the movable supporting frame (4) when the movable supporting frame (4) is accommodated in the accommodating groove (12) is arranged in the accommodating groove (12),
the dial indicator (3) is arranged at the free end of the movable supporting frame (4), the bulb measuring pin (5) is arranged at the non-connecting end of the fixed supporting frame (2), and the bulb of the bulb measuring pin (5) and the gauge head of the dial indicator (3) are respectively used for being in contact with the front side surface and the back side surface of the disc.
2. A thickness gauge for a disk having a wall thickness inclined according to claim 1,
the fixing unit (6) comprises a long square head screw, the screw part of the long square head screw is fixed in a threaded hole in the accommodating groove (1),
the movable supporting frame (4) is provided with a fixing groove (41) for the head of the rectangular head screw to penetrate out, the width of the fixing groove (41) is larger than that of the head of the rectangular head screw, the width of the fixing groove (41) is smaller than that of the head of the rectangular head screw,
the head of the long square head screw penetrates through the fixing groove (41) and is tightly attached and fixed on the outer surface of the movable supporting frame (4), so that the movable supporting frame (4) is pressed and accommodated in the accommodating groove (12).
3. A thickness gauge for a disk having a wall thickness inclined according to claim 1,
the main body (1) is provided with a reference hole (13) of a measuring tool,
the distance B1 from the center of the dial indicator (3) to the measuring tool reference hole (13) is equal to B-phi A/2-phi D1 sin beta/2, wherein: b is a distance value from the measuring tool reference hole (13) to the center of the disc, phi A is a diameter value on a given diameter on the disc, phi D1 is a diameter value of a gauge head of the dial indicator (3), and beta is an inclination angle in the thickness direction of the side face of the disc contacted with the gauge head of the dial indicator (3);
the distance B2 from the center of the ball head measuring pin (5) to the measuring tool reference hole (13) is equal to B-phi A/2-phi D2 sin alpha/2, wherein: b is a distance value from the measuring tool reference hole (13) to the center of the disc, phi A is a diameter value on a given diameter on the disc, phi D2 is a diameter value of a ball head of the ball head measuring pin (5), and alpha is an inclination angle in the thickness direction of the side face of the disc contacted with the ball head of the ball head measuring pin (5).
4. A thickness gauge for a disk having a wall thickness inclined according to claim 1,
the bulb of the bulb measuring pin (5) is asymmetrical to the gauge head of the dial indicator (3).
5. A method for measuring the thickness of a wall-thickness inclined disc on a given diameter, comprising the wall-thickness inclined disc thickness measuring device of any one of claims 1 to 4, and comprising the steps of:
s1, manufacturing a standard part (7): manufacturing a standard part (7), wherein the structural reference and the measured position of the standard part (7) are consistent with the workpiece (8) to be measured, the standard part (7) is manufactured according to the size of the design drawing of the workpiece (8) to be measured, a point D3 on the excircle of the standard part (7) is taken, a thickness true value H3 on a given diameter phi A on the standard part (7) is measured, a diameter true value phi D3 at the position of D3 is measured, values of H3 and phi D3 are recorded and engraved on the standard part (7);
s2, opening the measuring tool and calibrating the measuring tool: opening the measuring tool, enabling the V-shaped structure of the measuring tool main body (1) to cross a point D3 on a standard part (7), enabling the ball head of a ball head measuring pin (5) to contact the standard part (7), closing the measuring tool, adjusting a fixing unit (6), enabling a movable supporting frame (4) to be in a stable accommodating state, adjusting a dial indicator (3), enabling the dial head of the dial indicator (3) to contact the standard part (7) and be in a dial pressing state, and adjusting the dial of the dial indicator (3) to return to zero;
s3, measuring the workpiece (8) to be measured by using the measuring tool: opening the measuring tool, enabling the V-shaped structure of the measuring tool main body (1) to cross a D point on the excircle of the workpiece to be measured (8), measuring a diameter value phi D of the D point by using the diameter measuring tool, enabling a ball head of a ball head measuring pin (5) to contact the workpiece to be measured (8), closing the measuring tool, adjusting a fixing unit (6), enabling a movable supporting frame (4) to be in a stable accommodating state, fixing the measuring tool, enabling the workpiece to be measured (8) to rotate for one circle, and reading out a maximum value E1 and a minimum value E2 of a pointer on a dial indicator (3) in the rotating process;
s4, calculating a thickness value range: calculating a minimum thickness value H1 and a maximum thickness value H2 on a given diameter phi A of the workpiece to be measured (8) according to the following formula, wherein H1= H3+ E2+1/2 (tan alpha + tan beta) (phi D3-phi D)/sin (gamma/2), H2= H3+ E1+1/2 (tan alpha + tan beta) (phi D3-phi D)/sin (gamma/2), alpha and beta are respectively the inclined angle values existing on the front surface and the back surface of the workpiece to be measured (8), and gamma is the opening angle of the V-shaped structure of the measuring tool main body (1);
s5, judging whether the machining of the workpiece (8) to be measured is qualified: comparing the range of H1-H2 with the allowable range value of the workpiece (8) to be measured, judging whether the thickness of the workpiece (8) to be measured on the given diameter is qualified or not, if the range of H1-H2 is in the allowable range of the workpiece (8) to be measured, indicating that the thickness of the workpiece (8) to be measured on the given diameter is qualified, and if the range of H1-H2 is not in the allowable range of the workpiece (8) to be measured or is overlapped with the allowable range of the workpiece to be measured, indicating that the thickness of the workpiece (8) to be measured on the given diameter is unqualified;
s6, carrying out qualification detection on the workpieces to be detected (8) in batches: and repeating the steps S3 to S5 every time when one workpiece (8) to be measured is replaced for measurement.
6. A method of measuring the thickness of a disc having a wall thickness inclined according to claim 5,
in the step S1, after the standard part (7) is manufactured, two scribed lines (9) are respectively scribed at the same positions of the front surface and the back surface of the standard part, the two scribed lines (9) are axisymmetric about a connecting line between a point D3 and the center of the disc, and a thickness measuring point on a given diameter phi A is positioned on the connecting line between the point D3 and the center of the disc.
7. A method of measuring the thickness of a disk having a wall thickness inclined at a given diameter according to claim 6,
the distance between two scribed lines (9) on the same side of the standard part (7) is 8-12 mm.
8. A method of measuring the thickness of a disk having a wall thickness inclined at a given diameter according to claim 6,
in the step S1, the standard part (7) is in a non-full-circle structure, the standard part (7) is a structure formed by cutting and intercepting a part with higher precision after the disk of the full-circle structure manufactured according to the design drawing of the workpiece to be detected is manufactured, and the cutting and intercepting part comprises a structure at the center of the circle of the disk and 1/6 structure which is more than the full circle along the center of the circle.
9. A method of measuring the thickness of a disk having a wall thickness inclined according to any one of claims 6 to 8,
in the step S2, the contact point of the ball head measuring pin (5) and the standard part (3) is located within the range of the two scribed lines (9).
10. A method of measuring the thickness of a disk having a wall thickness inclined according to any one of claims 6 to 8,
in the step S3, in the process of measuring the workpiece (8) to be measured by using the measuring tool, the workpiece (8) to be measured is always installed on the machine tool.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210896921.5A CN115319539B (en) | 2022-07-28 | 2022-07-28 | Thickness measuring tool and method for disc with inclined wall thickness on given diameter |
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| CN202210896921.5A CN115319539B (en) | 2022-07-28 | 2022-07-28 | Thickness measuring tool and method for disc with inclined wall thickness on given diameter |
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| CN216159775U (en) * | 2021-09-02 | 2022-04-01 | 上汽通用五菱汽车股份有限公司 | Grinding wheel abrasive material thickness measuring device |
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| US2224728A (en) * | 1938-07-09 | 1940-12-10 | Westinghouse Electric & Mfg Co | Thickness gauge |
| NL7904757A (en) * | 1979-06-19 | 1980-12-23 | Estel Hoogovens Bv | Mechanical thickness gauge with adjustable probes - has measuring head with section above and below sheet using weights and spring cylinders |
| CN102878901A (en) * | 2012-09-24 | 2013-01-16 | 常州市双成工具有限公司 | Device for measuring wall thickness difference of piston pin |
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| CN115319539B (en) | 2023-07-25 |
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