Tool for rapidly detecting position degree of tongue-and-groove of large-size disc

Abstract

The tool for rapidly detecting the position degree of the mortise of the large-size disc comprises a main body with a special-shaped structure, a spring, a lever, a dial indicator, an end face positioning plate and a positioning block, continuously arranged grooves are formed in the inner end face of the main body, pull pins are arranged in the grooves, the lever is arranged in a T-shaped structure and comprises three positioning references, and the dial indicator is arranged on the main body. During detection, the three references are tightly attached to the working face, the end face and the bottom face of a mortise of a part to fix the measuring tool, it is ensured that the measuring head on the other side is located at the fixed position during detection each time, it is ensured that good reproducibility can still be achieved during detection of different persons, meanwhile, the two grabbing handles are additionally arranged, force application of the detection persons is facilitated, and the measuring efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of detection tools, and in particular relates to a tool for quickly detecting the position of a tenon groove of a large-sized plate. Background Art

[0002] There are generally two methods for detecting the position of mortise and tenon plates with mortise and tenon grooves. The first is to use the CMM three-coordinate detection system to detect the entire surface and contour of the mortise and tenon groove of the part, fit the center line of the mortise and tenon groove, and then provide the mortise and tenon groove position. Its disadvantages are that it is time-consuming, at least 3 hours for a single piece, and when detecting oblique mortise and tenon grooves, improper probe deflection angle will interfere with the part; the second is to use the normal micrometer to detect, directly measuring the distance difference from the tip of the mortise and tenon groove end face to the mortise and tenon groove working surface for conversion. This method relies on the skill level of the inspector and the detection stability, and the detection repeatability and reliability are poor, so the measurement efficiency of the two methods is low.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a tool for quickly detecting the position accuracy of the tenon groove of large-sized plate parts, thereby solving the technical problem of low measurement efficiency of existing measurement methods. The technical solution of this case has many technical benefits, as described below:

[0005] A tool for quickly detecting the position of the tenon groove of a large-sized plate, comprising a main body with a special-shaped structure, a spring, a lever, a dial indicator, an end face positioning plate and a positioning block, wherein the inner end face of the main body is provided with a continuously arranged groove, a pull pin is arranged in the groove, and the lever is arranged in a T-shaped structure, wherein:

[0006] The central area of the large end of the lever is mounted on one end of the main body in a rotatable manner, and one end of the large end of the lever is mounted with a measuring head with a spherical structure, and the other end of the large end of the lever is a free end, which is used for hand-held rotation by an operator, and the small end of the lever is a free end, and a flat contact is provided at a position adjacent to the free end on the small end of the lever, and the flat contact is used to dock with the measuring end of the dial indicator; the position of the pull pin corresponds to the position of the free end, and the two ends of the spring are respectively hooked on the pull pin and the free end, and the measuring head can make point contact with the working surface of the disk, and the side surfaces of the other end of the main body are respectively mounted with the end face positioning plate and the positioning block, and the end face is mounted with a ball pin, the end face positioning plate and the positioning block are used for positioning the main body, and the ball pin is used for the inspector to clamp the main body with his fingers;

[0007] The dial indicator is mounted on the outer end surface of the main body at a position adjacent to the lever, and the measuring end of the dial indicator can contact the flat contact when in motion.

[0008] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0009] The invention uses a three-directional positioning structure to accurately position the measuring tool and the part, ensuring the stability of the measurement results, and no longer relying entirely on the ability of the measurement personnel; the invention has good interchangeability, and adopts a split structure. For parts of different sizes, they can be replaced by replacing various positioning components, etc., and have certain universality and interchangeability; good accuracy: the positioning reference of the invention is completely consistent with the reference of the design drawing, which reduces the error caused by the conversion reference measurement and can more intuitively and accurately reflect the position of the part; long service life: the various components of the invention (especially the measuring head) have been wear-resistant treated, which effectively extends the service life and measurement accuracy; portability: the invention is small and portable, can be operated by one person, and can be used in various measurement environments. It is easy to operate and efficient; low cost: the invention has a simple structure and small components, which greatly reduces the detection cost, and a single measuring tool can be used for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 is a schematic diagram of a first viewing direction of the present invention;

[0012] Figure 2 is a schematic diagram of a second viewing direction of the present invention;

[0013] Figure 3 is a schematic diagram of a third viewing angle of the present invention;

[0014] Figure 4 It is a structural diagram of the main body of the present invention, wherein,

[0015] 1. Main body; 2. Spring; 3. Lever; 4. Micrometer; 5. End face positioning plate; 6. Positioning block; 7. Measuring rod; 8. Measuring head; 9. Flat contact; 10. Pull pin; 11. Ball pin. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that aspects can be practiced without these specific details. In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. The terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise stated, "multiple" means two or more.

[0018] like Figures 1 to 4 The tool for quickly detecting the position of the tenon groove of a large-sized disk shown in the figure has a large-sized disk as a component, which includes a main body 1 with a special-shaped structure (for example, a combination of an arc structure + a broken line segment structure, or a question mark structure or other non-continuous or non-closed linear structure), a spring 2 (a hook-type spring 2), a lever 3, a micrometer 4 or a percentage, an end face positioning plate 5 and a positioning block 6. The inner end face of the main body 1 is provided with a continuously arranged groove, a pull pin 10 is provided in the groove, and the lever 3 is arranged in a T-shaped structure. Preferably, the large end and the small end of the lever 3 are arranged in an arc-shaped transition structure, wherein,

[0019] The central area of the large end of the lever 3 is mounted on one end of the main body 1 in a rotatable manner. A measuring head 8 with a spherical structure is installed at one end of the large end of the lever 3. The other end of the large end of the lever 3 is a free end for the operator to hold and rotate. The small end of the lever 3 is the free end. A flat contact 9 is provided on the small end of the lever 3 near the free end. The flat contact 9 is used to dock with the measuring end of the dial indicator 4, so that the dial indicator can be read passively. The position of the pull pin 10 corresponds to the position of the free end. The two ends of the spring 2 are respectively hooked on the pull pin 10 and the free end. The measuring head 8 can make point contact with the working surface of the disk for circumferential positioning. The side of the other end of the main body 1 is respectively installed with the end face positioning plate 5 and the positioning block 6 to position the main body 1. For example, the length of the end face positioning plate 5 is greater than the height of the main body 1. The bottom surface of the end face positioning plate 5 is provided with a pin hole. When the end face positioning plate 5 contacts the outer end face of the part, the pin is inserted into the pin hole to limit the height direction of the part. The pin can also facilitate the operator to apply force to make the lower end face of the end face positioning plate 5 closely contact the end face of the part. The mortise and tenon on the side of the positioning block 6 is closely contacted with the working surface near the center. In conjunction with the use of the ball stud 11, the inclination angle of the measuring tool can be constant. The end face of the main body 1 on one side of the principle lever 3 is installed with a ball stud 11 (near the positioning block 6), which makes it easy for the inspector to use his fingers to clamp the measuring tool. For example, the ball stud 11 contacts the bottom surface of the mortise to ensure the distance of the measuring point relative to the center of the part. A micrometer 4 is installed on the outer end face of the main body 1 near the lever 3. The measuring end of the micrometer 4 can contact the flat contact 9 when it is in motion. Preferably, the measuring end of the micrometer 4 is installed with a measuring rod 7. One end of the measuring rod 7 can contact the flat contact 9 under the drive of the lever 3 to realize the reading feedback of the micrometer 4, avoiding the influence of the technique and angle deviation on the final result when the inspector uses the common normal micrometer. The flat contact 9 plays the role of transferring the movement of the lever 3 into the movement of the measuring rod 7, and then performing accurate measurement through the measuring gauge. It should be pointed out that the tightness of the spring 2 directly affects the contact force between the measuring head 8 and the part. The spring 2 is preferably a spring 2 with adjustable elasticity. The force is fixed, which can reduce the influence on the measurement result.

[0020] The three positioning references of the pin, the two ends and the ball pin 11 can fix the tool or distance measurement in all directions relative to the part. For this type of special mortise and tenon position measuring tool, its degrees of freedom when in working state has been completely restricted, and its position, posture and inclination relative to the part are unique. The designed reference positioning block / ball head greatly improves the detection accuracy and efficiency, which is more scientific and effective than traditional methods.

[0021] In a specific embodiment, an arcuate groove or an arcuate notch is provided on the large end of the lever 3 away from the measuring head 8. The arcuate groove or the arcuate notch is used to improve the operator's grip strength so that the lever 3 can be gripped tightly. The central area of the large end of the lever 3 is hinged to one end of the main body 1, and the lever 3 can rotate freely relative to the main body 1 for easy installation.

[0022] In a specific embodiment, the inner end face of the main body 1 is provided with an arc-shaped transition portion, which is used to transition to a line segment structure at the end of the main body 1 away from the lever 3, or the end of the main body 1 adjacent to the lever 3 is provided with a three-segment broken line structure, and the outer end face of the middle broken line is installed with a micrometer 4.

[0023] Furthermore, a gauge clamp and a gauge clamp nut are mounted on the outer end face of the middle fold line to accommodate the installation of a micrometer 4, and the reading fed back by the micrometer is theoretically compensated. The function of the normal micrometer is to measure the distance from the first mortise tip to the adjacent mortise working surface. This distance does not directly reflect the actual mortise width difference, so this difference needs to be eliminated. Specifically,

[0024] The height and width of the mortise are converted into the circumferential offset A1 = a × (c / b) × sin (α) + tan (β) × cos (α), where α is the main inclination angle of the mortise, β is the secondary inclination angle of the mortise, the mortise length measured by the micrometer is c, the mortise length of the part is b, and the difference between the inlet and outlet T values of a single groove is no more than a.

[0025] When the mortise and tenon dimensions at circumference n are all qualified, the bottom angle values on both sides of the mortise and tenon are converted into the offset in the length direction of the circumferential arc: A2 = B1 / n, where the difference in the bottom angle values on both sides of the mortise and tenon is B. When calculated based on the maximum wear condition, the tolerance corresponds to the circumferential arc length B1.

[0026] The mortise and tenon is a double-angle mortise and tenon, with a mortise height of H and a height difference of h at the measuring position. The maximum tolerance is C, and the deviation in the radius direction of the part is C*(h / H), which is converted to a deviation in the arc direction of C1. In the measurement direction corresponding to 0.03257mm in the measured width direction, the converted deviation in the arc direction is C2.

[0027] The position requirement of the part's mortise and tenon in the arc direction is X=A1+B1 / n+C1+C2+the normal measurement tolerance in the arc direction.

[0028] How to use the measurement process:

[0029] 1. Clean the parts to be measured

[0030] 2. Hold the screw of the end face positioning plate with your left hand and apply downward force toward the center of the part. Hold the measuring tool body with your right hand, place the ball stud against the bottom surface of the left tenon groove, and place the positioning block against the right working surface of the left tenon groove to complete the positioning of the measuring tool.

[0031] 3. Press the lever to make the measuring head contact normally with the left working surface of the right mortise.

[0032] 4. Record the dial indicator reading

[0033] 5. Loosen the measuring tool and take it out to continue measuring the thickness between adjacent mortises

[0034] 6. Compare the numerical differences of each mortise and tenon, record the difference between the maximum and minimum values as the mortise and tenon position degree.

[0035] This method actually measures the vertical distance between two adjacent mortises, from the clear tip of one mortise to the nearest surface of the other. First, we determine the mortise position accuracy, which includes two aspects: the angular difference between the center planes of each mortise and the difference in polar radius. This refers to the difference in the mortise centerline angle and the difference in the outer radius. If the double-angle mortise is simplified to a straight mortise, the difference in the fixed height and width of the mortise and the difference in the bottom angles on both sides of the mortise are also measured.

[0036] The difference in the fixed height and width of the mortise and tenon: Tolerance A, that is, the stability of the mortise and tenon broach width, is related to the wear coefficient of the mortise and tenon. According to the design requirements, the difference between the inlet and outlet of the single groove T value is not greater than a. The length of the mortise and tenon of the part is b, and the length of the mortise and tenon corresponding to the measurement position is c. The theoretical difference is A1 (in the direction of the length of the circular arc), where:

[0037] According to the definition of the width deviation a of the mortise and tenon inlet and outlet, combined with the double-angle geometric characteristics, the corrected circumferential offset calculation formula is as follows:

[0038] Calculation formula:

[0039] A1=a×(c / b)×sin(α)+tan(β)×cos(α)

[0040] Parameter Description:

[0041] -a: Tenon inlet and outlet width deviation (design given value)

[0042] -c: Length of the mortise and tenon corresponding to the measurement position (actual detection section length)

[0043] -b: Total length of the part's mortise and tenon (design reference length)

[0044] -α: main inclination angle of the mortise and tenon (usually a dovetail angle, such as 55° or 60°)

[0045] -β: mortise and tenon secondary inclination angle (forming a double inclination structure with the main inclination angle)

[0046] Derivation process:

[0047] 1. Decomposition of import and export deviation: decompose a into the component along the length of the mortise and tenon (a∥) and the vertical component (a⊥)

[0048] a∥=a×(c / b) / / Lengthwise scaling

[0049] a⊥=a×(c / b)×tan(β) / / Amplification effect in the inclination direction 2. Geometric projection synthesis: Project the decomposed components in the circumferential direction

[0050] A1=√(a∥2+(a⊥×cos(α))2)

[0051] =a×(c / b)×√(1+tan2(β)×cos 2 (α))

[0052] =a×(c / b)×sin(α)+tan(β)×cos(α) / / Trigonometric identity transformation

[0053] Application examples:

[0054] When the mortise and tenon parameters are:

[0055] -a=0.08mm (difference in inlet and outlet width)

[0056] -c=60mm(detection section length)

[0057] -b=240mm(total length)

[0058] -α=55°(main inclination angle)

[0059] -β=10°(sub-tilt angle)

[0060] Calculated:

[0061] A1=0.08×(60 / 240)×sin55°+tan10°×cos55°

[0062] ≈0.02×0.8192+0.1763×0.5736

[0063] ≈0.02×0.894≈0.0179mm

[0064] Technical points:

[0065] 1. The dual-tilt structure requires calculating the main and auxiliary tilt angles separately and then synthesizing the vectors.

[0066] 2. The measurement position c should be selected in the stress concentration area (usually 1 / 3 away from the end of the tenon)

[0067] 3. The dynamic change of β angle caused by thermal deformation needs to be considered during high-precision machining

[0068] 4. This formula is applicable to mass production scenarios below ISO 2768-m level accuracy

[0069] Verification method:

[0070] The actual width of the mortise and tenon inlet and outlet can be detected by a three-dimensional coordinate measuring machine, and the theoretical offset A1 can be inferred by substituting it into the formula and compared with the measured value for verification (the allowable error is ±0.005mm).

[0071] The difference in bottom angles on either side of the mortise is called tolerance B, which represents the stability of the mortise broach angle. This tolerance is related to the mortise wear coefficient and tool installation stability. Calculated based on the maximum wear condition, the tolerance corresponds to a circular arc length of B1 (in the direction of the circular arc length). To ensure that the mortise dimensions at point n on the circumference are all qualified, the variation between two adjacent grooves is B1 / n (in the direction of the circular arc length).

[0072] Furthermore, since this part features a double-angled mortise and tenon, the following control measures are applied: "The difference between the measured dimensions at the W and V points of a single mortise and the nominal values at these points must not exceed C" and "T°+-t′." The mortise height is H mm, and the measurement position accounts for the height difference h. This results in a deviation of C*(h / H) (radially), which translates to C1 mm in the arc direction. T°+-t′, corresponding to the measured width, is 0.03257 mm (in the measurement direction), which translates to C2 mm in the arc direction.

[0073] The part mortise position requirement X (arc direction) = the difference in the fixed height and width of the mortise (arc direction) + the difference in the bottom angles on both sides of the mortise (in the direction of the circular arc length) + the difference in the inclination angle (arc direction) + the normal measurement tolerance (arc direction) = A1 + B1 / n + C1 + C2 + the normal measurement tolerance (arc direction).

[0074] The above is a detailed introduction to the product provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the core ideas of the present invention. It should be pointed out that, for those skilled in the art, without departing from the principles of the invention, several improvements and modifications can be made to the invention, and these improvements and modifications also fall within the scope of protection of the invention claims.

Claims

1. A tool for quickly detecting the position of the tenon groove of a large-sized plate, characterized by: It includes a main body, a spring, a lever, a dial indicator, an end face positioning plate and a positioning block with a special structure. The inner end face of the main body is provided with a continuous groove, a pull pin is provided in the groove, and the lever is provided in a T-shaped structure. The central area of the large end of the lever is mounted on one end of the main body in a rotatable manner, and one end of the large end of the lever is mounted with a measuring head with a spherical structure, and the other end of the large end of the lever is a free end, which is used for hand-held rotation by an operator, and the small end of the lever is a free end, and a flat contact is provided at a position adjacent to the free end on the small end of the lever, and the flat contact is used to dock with the measuring end of the dial indicator; the position of the pull pin corresponds to the position of the free end, and the two ends of the spring are respectively hooked on the pull pin and the free end, and the measuring head can make point contact with the working surface of the disk, and the side surfaces of the other end of the main body are respectively mounted with the end face positioning plate and the positioning block, and the end face is mounted with a ball pin, the end face positioning plate and the positioning block are used for positioning the main body, and the ball pin is used for the inspector to clamp the main body with his fingers; The dial indicator is mounted on the outer end surface of the main body at a position adjacent to the lever, and the measuring end of the dial indicator can contact the flat contact when in motion.

2. The tool according to claim 1, characterized in that An arcuate groove or an arcuate notch is provided on the large end of the lever, which is away from the measuring head. The arcuate groove or the arcuate notch is used to improve the operator's grip strength so that the operator can hold the lever tightly.

3. The tool according to claim 1, characterized in that The central area of the large end of the lever is hinged to one end of the main body, and the lever can rotate freely relative to the main body.

4. The tool according to claim 1, characterized in that The inner end surface of the main body is provided with an arc-shaped transition portion, and the arc-shaped transition portion is used to transition from one end of the main body away from the lever in a line segment structure, or, One end of the adjacent lever on the main body is arranged in a three-section broken line structure, and the outer end surface of the middle broken line is installed with the dial indicator.

5. The tool according to claim 4, characterized in that The outer end surface of the middle fold line is equipped with a dial clamp and a dial clamp nut to adapt to the installation of the micrometer.

6. The tool according to claim 4, characterized in that A measuring rod is installed at the measuring end of the dial gauge, and one end of the measuring rod can contact the flat contact under the drive of the lever to realize the reading feedback of the dial gauge.

7. The tool according to claim 6, characterized in that Theoretical compensation of the reading of the dial gauge feedback includes: The height and width of the mortise are converted into the circumferential offset A1 = a × (c / b) × sin (α) + tan (β) × cos (α), where α is the main inclination angle of the mortise, β is the secondary inclination angle of the mortise, the mortise length measured by the micrometer is c, the mortise length of the part is b, and the difference between the inlet and outlet T values of a single groove is no more than a. When the mortise and tenon dimensions at circumference n are all qualified, the bottom angle values on both sides of the mortise and tenon are converted into the offset in the length direction of the circumferential arc: A2 = B1 / n, where the difference in the bottom angle values on both sides of the mortise and tenon is B. When calculated based on the maximum wear condition, the tolerance corresponds to the circumferential arc length B1. The mortise and tenon is a double-angle mortise and tenon, with a mortise height of H, a height difference of h at the measuring position, a maximum tolerance of C, and a deviation in the radius direction of the part of C*(h / H), which is converted to a deviation in the arc direction of C1. The deviation in the arc direction converted according to the measured width direction is C2. The position requirement of the part's mortise and tenon in the arc direction is X=A1+B1 / n+C1+C2+the normal measurement tolerance in the arc direction.

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