Detection method for measuring shape and position dimension of mortise through three-coordinate simulation rolling rod and positioning device of detection method

Abstract

The invention belongs to the technical field of tongue-and-groove detection of workpieces, and particularly relates to a detection method for measuring the shape and position size of a tongue-and-groove through a three-coordinate simulation rolling rod and a positioning device of the detection method. The method breaks through the limitation that a special measuring tool must be manufactured to detect the shape and the position size (the rolling rod value) of the mortise, especially for product trial-manufacture, the period and the cost for manufacturing the special measuring tool are saved, the trial-manufacture efficiency can be greatly improved, and the trial-manufacture cost input of parts is reduced. The detection method adopted by the invention comprises the steps of (1) adjusting a positioning device to place a workpiece, (2) establishing an external coordinate system, (3) determining the angular position of a mortise of the workpiece, (4) constructing a workpiece mortise detection coordinate system, (5) detecting the mortise and simulating the geometric structure of a rolling rod, (6) constructing a mortise center line, (7) establishing an evaluation coordinate system NEWCS, and (8) calculating and evaluating the shape and position size (rolling rod value) of the mortise.

Description

Technical Field

[0001] The invention belongs to the technical field of mortise and tenon detection of workpieces, and specifically relates to a detection method for measuring mortise and tenon shape and position size by using a three-coordinate simulated roller and a positioning device thereof. Background Art

[0002] The core components of aircraft engines, high-pressure turbine components, are inseparable from turbine discs and blades. The connection between them is in the form of mortise and tenon. Among them, the mortise and tenon dimension characteristics detection requirements on turbine discs, domestic designs usually use rolling rod values ​​to determine the slot opening size and the mortise and tenon radial position dimensional characteristics. Among them, the dimensional characteristics of the slot opening size are as follows: Figure 5 In L1, two rollers 01 and 02 are generally placed in the V-shaped surface with symmetrical mortise contours. A combination block gauge is used. After trial plugging and reassembly, the test values ​​of K1 and K2 can be obtained after multiple attempts. The radial position dimension characteristics of the mortise are as follows: Figure 6 It is difficult to detect M1 and M2 using actual rollers. The method consists of two steps:

[0003] Step 1: Place roller 01 and roller 02 into the mortise profile and tighten the two rollers with a combination block gauge;

[0004] Step 2: Measure the distance from the highest point of the two rollers to the rotation center of the part along the center line of the mortise. There are two main difficulties in this. First, the fixing force of the rollers should be moderate. If the force is too small, the rollers cannot be pressed tightly, and if the force is too large, the mortise will be deformed. Second, the rotation center of the part is a spatial point and cannot be measured directly. Usually, it needs to be indirectly measured by using the inner hole or outer circle of the part. The center line of the mortise is also a spatial straight line, which is difficult to determine.

[0005] In summary, the measurement results obtained by the existing measurement methods are not accurate and the detection efficiency is low. There is an urgent need to find a simple, fast, convenient method that can achieve high-precision measurement. Summary of the invention

[0006] The present invention provides a detection method and a positioning device for measuring the shape and position size of a mortise and tenon by a three-coordinate simulated roller, which breaks through the limitation that a special measuring tool must be prepared to detect the shape and position size (rolling rod value) of the mortise and tenon, and is particularly suitable for product trial production. It saves the cycle and cost of making a special measuring tool, can greatly improve the trial production efficiency, and reduce the cost investment in parts trial production.

[0007] In order to overcome the problems existing in the prior art, the technical solution adopted by the present invention is: a detection method for measuring the shape and position size of the tenon groove by a three-coordinate simulated roller, the steps are as follows:

[0008] 1) Adjust the positioning device to place the workpiece

[0009] Place the positioning device on the three-coordinate marble platform, adjust the height of the two guard plates to be 1-2mm less than the thickness of the tenon groove of the workpiece to be tested, tighten the bolts, place the notch of the L-shaped main part of the positioning device toward the positive direction of the three-coordinate X-axis, place the workpiece on the upper surface of the L-shaped main part, so that the tenon teeth are in contact with the two guard plates, and then place the equal height block on the lower surface of the workpiece tenon teeth so that the tenon teeth are always close to the two guard plates, gently rotate the workpiece, and visually observe that the tenon groove to be tested is located in the positive direction of the three-coordinate X-axis;

[0010] 2) Establish an external coordinate system

[0011] After placing the workpiece, use the three-coordinate measuring needle to pick points on the part reference circle and reference surface to establish the workpiece coordinate system, and store the coordinate system as an external coordinate system;

[0012] 3) Determine the angular position of the mortise and tenon of the workpiece

[0013] In the external coordinate system, move the three-dimensional measuring needle to the top of the nominal position of the mortise and tenon and stop. Use the positioning device to ensure that the center of the workpiece remains unchanged. Rotate the workpiece so that the center line of the mortise and tenon reaches the position below the measuring needle.

[0014] 4) Construct the workpiece mortise and tenon detection coordinate system

[0015] The three-coordinate measuring needle touches the workpiece reference circle to detect the workpiece center, touches two symmetrical points of the mortise opening, constructs the mortise midpoint, and uses the workpiece center and the mortise midpoint to establish the coordinate system CS_1. Repeat the above steps to further accurately establish the coordinate system CS_2; measure the bottom point W of the mortise along the X-axis direction, combine the nominal distance M between the bottom of the mortise and the center of the mortise, and translate the coordinate system CS_2 to construct the mortise center point coordinate system CS_3;

[0016] 5) Mortise and tenon detection and simulated roller geometry

[0017] Under the coordinate system CS_3, the mortise and tenon profile is detected; 4 working surface and 4 non-working surface measured points are extracted from them to construct straight lines L1, L2, L3, L4, L5, L6, L7, L8; the above 8 straight lines are offset by the roller radius R respectively to obtain 8 offset lines L1', L2', L3', L4', L5', L6', L7', L8'; the 8 offset lines are intersected in pairs to obtain 4 intersection points as the center points O1, O2, O3, O4 of the simulated roller;

[0018] 6) Construct the center line of the mortise and tenon

[0019] The midpoint of construction point O1 and construction point O2 is taken as the first center point P of the mortise, and the midpoint of construction point O3 and construction point O4 is taken as the second center point B of the mortise; the straight line formed by point P and point B is the center line of the mortise;

[0020] 7) Establish evaluation coordinate system NEW_CS

[0021] Re-establish the direction of the X-axis of the coordinate system CS_2 according to the straight line BP, and the new coordinate system is the coordinate system NEW_CS;

[0022] 8) Calculation and evaluation of the shape and position dimensions of the mortise and tenon (roller value)

[0023] In the coordinate system NEW_CS, the direction of the X axis is parallel to the center line of the mortise and tenon. Below NEW_CS,

[0024] The X-axis coordinate value of point P is recorded as: P ;

[0025] The X-axis coordinate value of point B is recorded as: B ;

[0026] The Y-axis coordinate value of point O1 is recorded as: O1 ;

[0027] The Y-axis coordinate value of point O2 is recorded as: O2 ;

[0028] The Y-axis coordinate value of point O3 is recorded as: O3 ;

[0029] The Y-axis coordinate value of point O4 is recorded as: O4 ;

[0030] Then: M1=X P +R;M2=X B +R;

[0031] L1=Y O1 -Y O2 -2R; L2 = Y O3 -Y O4 -2R.

[0032] The positioning device adopted in the detection method comprises a main body, a right guard plate, a left guard plate and an equal height block. The main body is an L-shaped plate, and windows are arranged in the center of the two side plates of the L-shaped plate. The two guard plates are respectively arranged outside the two side surfaces of the main body and are higher than the upper surface of the main body and are connected by bolts. The inner side of the main body is provided with an equal height block, and the equal height block is a stepped column type. The workpiece is arranged at the center position formed by the upper part of the main body and the equal height block.

[0033] Furthermore, waist-shaped holes are provided on both sides of each guard plate, and the guard plate is connected to the main body part through the waist-shaped holes and bolts.

[0034] Furthermore, the waist-shaped hole is a vertical waist-shaped hole, and the height adjustment with the main body part is achieved through the waist-shaped hole.

[0035] Furthermore, the equal-height block has the same height as the upper surface of the main body portion and can be separated from the main body portion and can move freely.

[0036] Furthermore, the material of the guard plate is polytetrafluoroethylene.

[0037] Furthermore, threaded holes are respectively arranged on the upper parts of the two side surfaces of the main body.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1. The positioning device of the present invention has a simple structure, is easy to manufacture, and is easy to use;

[0040] 2. The method for measuring the shape and position size of the mortise and tenon according to the present invention is simple and effectively reduces the measurement error caused by human operation and has high accuracy.

[0041] 3. When testing the rolling rod value of the fir-tree type tenon groove, the testing method of the present invention can be used to test the shape of the tenon groove ( Figure 6 L1 and L2) size detection; at the same time, the mortise and tenon position ( Figure 6 This method reduces the detection error caused by the difference in force between the two rollers when the inspector inserts the combination block gauge, improves the detection accuracy, simplifies the need to make special measuring tools to align the center line of the mortise and tenon, and make rollers for detection, while saving detection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the positioning device of the present invention.

[0043] Figure 2 It is a structural schematic diagram of the main part of the positioning device.

[0044] Figure 3 It is a schematic diagram of the structure of the tongue and groove tip edge guard plate of the part.

[0045] Figure 4 It is a schematic diagram of the equal height block structure.

[0046] Figure 5 It is a schematic diagram of the geometric structure of the mortise and tenon detection and simulation roller.

[0047] Figure 6 It is a schematic diagram of the mortise and tenon centerline structure and simulated roller detection dimension calculation.

[0048] Figure 7 It is a schematic diagram of the construction of the workpiece tenon and groove detection coordinate system.

[0049] Figure 8 It is a structural diagram of the workpiece.

[0050] Marking description: 1-main part, 2-1-right guard plate, 2-2-left guard plate, 3-workpiece, 4-bolt, 5-equal height block;

[0051] 1a-upper surface of the main body, 1b-threaded hole one, 1c-threaded hole two, 1d-threaded hole three, 1e-threaded hole four, 1f-window one, 1g-window two, 2-1a-right guard plate positioning surface, 2-1b-waist-shaped hole one, 2-1c-waist-shaped hole two, 2-2a-left guard plate positioning surface, 2-2b-waist-shaped hole three, 2-2c-waist-shaped hole four, 3a-tenon upper end face, 3b-tenon lower end face, 4-1-bolt one, 4-2-bolt two, 4-3-bolt three, 4-4-bolt four, 5a-climbing block end face. DETAILED DESCRIPTION

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] The positioning device of the present invention is as follows Figure 1-Figure 4 As shown, it includes a main body 1, a right guard plate 2-1, a left guard plate 2-2, bolts 4 and equal height blocks 5.

[0055] The main body 1 is an L-shaped plate, and a window 1g and a window 1f are respectively opened on two side surfaces of the main body 1, and a threaded hole 1b, a threaded hole 1c, a threaded hole 1d and a threaded hole 1e are respectively formed on the upper portions of the two side surfaces.

[0056] The right guard plate 2-1 and the left guard plate 2-2 are respectively arranged outside the two side surfaces of the main body 1 (the right guard plate positioning surface 2-1a and the left guard plate positioning surface 2-2a are respectively attached to the outer side surfaces of the main body), and are attached to the main body 1 and are higher than the upper surface of the main body 1; vertical waist-shaped holes 2-1b, 2-1c and 2-2b, 2-2c are respectively arranged on both sides of the guard plate; the left and right guard plates are connected to the two side surfaces of the main body 1 by bolts 1 4-1, bolts 2 4-2, bolts 3 4-3 and bolts 4 4-4; the height of the left and right guard plates and the main body 1 can be adjusted up and down by the bolts on the four waist-shaped holes. The material used for the guard plate 2 is a material such as polytetrafluoroethylene that is high in strength, wear-resistant and not easy to damage the tooth tip of the workpiece tenon.

[0057] The inner side of the main body 1 is provided with a height block 5, which is a stepped column type, and the workpiece 3 is arranged at the center formed by the main body 1 and the upper part of the height block 5. The workpiece 3 is mounted at the center of the end surface 5a of the height block. The height of the height block 5 is equal to that of the upper surface of the main body 1, and it can be separated from the main body and moved freely.

[0058] A three-coordinate simulated roller measuring method for measuring the shape and position size of the mortise and tenon groove, such as Figure 5-Figure 7 As shown, the steps are:

[0059] 1) Adjust the positioning device to place the workpiece

[0060] Place the positioning device on the three-dimensional marble platform, loosen the four bolts to adjust the height of the two guard plates to be slightly less than the thickness of the tenon groove of the workpiece to be tested by 1-2mm, and tighten the bolts. Place the notch of the L-shaped main body of the positioning device in a certain direction, such as the positive direction of the three-dimensional X-axis, and place the workpiece on the upper surface 1a of the main body so that the tenon teeth are in contact with the two guard plates. Then, place the equal height block on the lower end surface 3b of the workpiece tenon teeth so that the tenon teeth are always slightly close to the two guard plates. Gently rotate the workpiece and visually observe that the tenon groove to be tested is roughly located in the positive direction of the three-dimensional X-axis.

[0061] 2) Establish an external coordinate system

[0062] After placing the workpiece, use the three-coordinate measuring needle to pick points on the actual reference circle and reference surface of the part, establish the workpiece coordinate system, and store the coordinate system as an external coordinate system;

[0063] 3) Determine the angular position of the mortise and tenon of the workpiece

[0064] In the external coordinate system, move the three-coordinate measuring needle to the top of the nominal position of the mortise (that is, the upper end surface 3a of the tenon) and stop. Use the positioning device to ensure that the center of the workpiece remains unchanged. Rotate the workpiece so that the center line of the mortise reaches the position below the measuring needle.

[0065] 4) Construct the workpiece mortise and tenon detection coordinate system, such as Figure 7 Shown

[0066] The three-coordinate measuring needle touches the workpiece reference circle to detect the workpiece center, touches two symmetrical points of the mortise opening, constructs the mortise midpoint, and uses the workpiece center and the mortise midpoint to establish the coordinate system CS_1. Repeat the above steps to further accurately establish the coordinate system CS_2; measure the bottom point W of the mortise along the X-axis direction, combine the nominal distance M between the bottom of the mortise and the center of the mortise, and translate the coordinate system CS_2 to construct the mortise center point coordinate system CS_3;

[0067] 5) Mortise and tenon detection and simulation of the geometry of the roller, such as Figure 5 Shown

[0068] Under the coordinate system CS_3, the mortise and tenon profile is detected; 4 working surface and 4 non-working surface measured points are extracted from them to construct straight lines L1, L2, L3, L4, L5, L6, L7, L8; the above 8 straight lines are offset by the roller radius R respectively to obtain 8 offset lines L1', L2', L3', L4', L5', L6', L7', L8'; the 8 offset lines are intersected in pairs to obtain 4 intersection points as the center points O1, O2, O3, O4 of the simulated roller;

[0069] 6) Construct the center line of the mortise and tenon, such as Figure 6 Shown

[0070] The midpoint of construction point O1 and construction point O2 is taken as the first center point P of the mortise, and the midpoint of construction point O3 and construction point O4 is taken as the second center point B of the mortise; the straight line formed by point P and point B is the center line of the mortise;

[0071] 7) Establish evaluation coordinate system NEW_CS, such as Figure 6 Shown

[0072] Re-establish the direction of the X-axis of the coordinate system CS_2 according to the straight line BP, and the new coordinate system is the coordinate system NEW_CS;

[0073] 8) Calculation and evaluation of the shape and position dimensions of the mortise and tenon (roller value)

[0074] In the coordinate system NEW_CS, the direction of the X axis is parallel to the center line of the mortise and tenon. Below NEW_CS,

[0075] The X-axis coordinate value of point P is recorded as: P ;

[0076] The X-axis coordinate value of point B is recorded as: B ;

[0077] The Y-axis coordinate value of point O1 is recorded as: O1 ;

[0078] The Y-axis coordinate value of point O2 is recorded as: O2 ;

[0079] The Y-axis coordinate value of point O3 is recorded as: O3 ;

[0080] The Y-axis coordinate value of point O4 is recorded as: O4 ;

[0081] Then: M1=X P +R;M2=X B +R;

[0082] L1=Y O1 -Y O2 -2R; L2 = Y O3 -Y O4 -2R.

[0083] The above steps implement a method of using a positioning device to measure the shape and position size of a mortise and tenon by using a three-coordinate simulated roller. Repeating the above steps once can detect one mortise and tenon.

[0084] In the above description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed above.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for measuring the shape and position size of a mortise and tenon groove by a three-coordinate simulated roller, characterized in that: The steps are: 1) Adjust the positioning device to place the workpiece Place the positioning device on the three-coordinate marble platform, adjust the height of the two guard plates to be 1-2mm less than the thickness of the tenon groove of the workpiece to be tested, tighten the bolts, place the notch of the L-shaped main part of the positioning device toward the positive direction of the three-coordinate X-axis, place the workpiece on the upper surface of the L-shaped main part, so that the tenon teeth are in contact with the two guard plates, and then place the equal height block on the lower surface of the workpiece tenon teeth so that the tenon teeth are always close to the two guard plates, gently rotate the workpiece, and visually observe that the tenon groove to be tested is located in the positive direction of the three-coordinate X-axis; 2) Establish an external coordinate system After placing the workpiece, use the three-coordinate measuring needle to pick points on the part reference circle and reference surface to establish the workpiece coordinate system, and store the coordinate system as an external coordinate system; 3) Determine the angular position of the mortise and tenon of the workpiece In the external coordinate system, move the three-dimensional measuring needle to the top of the nominal position of the mortise and tenon and stop. Use the positioning device to ensure that the center of the workpiece remains unchanged. Rotate the workpiece so that the center line of the mortise and tenon reaches the position below the measuring needle. 4) Construct the workpiece mortise and tenon detection coordinate system The three-coordinate measuring needle touches the workpiece reference circle to detect the workpiece center, touches two symmetrical points of the mortise opening, constructs the mortise midpoint, and uses the workpiece center and the mortise midpoint to establish the coordinate system CS_1. Repeat the above steps to further accurately establish the coordinate system CS_2; measure the bottom point W of the mortise along the X-axis direction, combine the nominal distance M between the bottom of the mortise and the center of the mortise, and translate the coordinate system CS_2 to construct the mortise center point coordinate system CS_3; 5) Mortise and tenon detection and simulated roller geometry Under the coordinate system CS_3, the mortise and tenon profile is detected; 4 working surface and 4 non-working surface measured points are extracted from them to construct straight lines L1, L2, L3, L4, L5, L6, L7, L8; the above 8 straight lines are offset by the roller radius R respectively to obtain 8 offset lines L1', L2', L3', L4', L5', L6', L7', L8'; the 8 offset lines are intersected in pairs to obtain 4 intersection points as the center points O1, O2, O3, O4 of the simulated roller; 6) Construct the center line of the mortise and tenon The midpoint of construction point O1 and construction point O2 is taken as the first center point P of the mortise, and the midpoint of construction point O3 and construction point O4 is taken as the second center point B of the mortise; the straight line formed by point P and point B is the center line of the mortise; 7) Establish evaluation coordinate system NEW_CS Re-establish the direction of the X-axis of the coordinate system CS_2 according to the straight line BP, and the new coordinate system is the coordinate system NEW_CS; 8) Calculation and evaluation of the shape and position dimensions (roller value) of the mortise and tenon In the coordinate system NEW_CS, the direction of the X axis is parallel to the center line of the mortise and tenon. Below NEW_CS, The X-axis coordinate value of point P is recorded as: P ; The X-axis coordinate value of point B is recorded as: B ; The Y-axis coordinate value of point O1 is recorded as: O1 ; The Y-axis coordinate value of point O2 is recorded as: O2 ; The Y-axis coordinate value of point O3 is recorded as: O3 ; The Y-axis coordinate value of point O4 is recorded as: O4 ; Then: M1 = X P +R;M2= X B +R; L1=Y O1 - AND O2 -2R;L2=Y O3 - AND O4 -2R。 2. The positioning device used in the detection method according to claim 1, characterized in that: The positioning device comprises a main body (1), a right guard plate (2-1), a left guard plate (2-2) and a height-equalizing block (5), wherein the main body (1) is an L-shaped plate, and windows are arranged at the center of two side plates of the L-shaped plate. The two guard plates are respectively arranged outside the two side surfaces of the main body (1) and are higher than the upper surface of the main body (1) and are connected by bolts. The inner side of the main body (1) is provided with a height-equalizing block (5), and the height-equalizing block (5) is a stepped column type. The workpiece (3) is arranged at the center position formed by the upper part of the main body (1) and the height-equalizing block (5).

3. The positioning device according to claim 2, characterized in that: Each guard plate is provided with waist-shaped holes on both sides, and is connected to the main body (1) via the waist-shaped holes and bolts.

4. The positioning device according to claim 3, characterized in that: The waist-shaped hole is a vertical waist-shaped hole, and the height adjustment with the main body part (1) is achieved through the waist-shaped hole.

5. The positioning device according to claim 4, characterized in that: The equal-height block (5) has the same height as the upper surface of the main body (1) and can be separated from the main body and moved freely.

6. The positioning device according to claim 5, characterized in that: The material of the guard plate (2) is polytetrafluoroethylene.

7. The positioning device according to claim 6, characterized in that: The upper parts of the two side surfaces of the main body part (1) are respectively provided with threaded holes.

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