Two-sided width symmetry measurement method

Abstract

To provide a method pertaining to a workpiece that includes a width across flats part and includes a cylindrical part whose diameter is constant along the axial direction, and helping to easily measure the symmetry of the width across flats part to the cylindrical part.SOLUTION: The present invention is a method regarding a workpiece that includes a width across flats part 2 where one flat is a first plane 21 and the other flat is a second plane 22 and includes a cylindrical part 1 whose diameter is constant along an axis Z, and measuring the symmetry of the width across flats part 2 to the cylindrical part 1. When the planes parallel to the first plane 21 and second plane 22 are generally named reference planes 3, the distance between the first plane 21 and one of the reference planes 3 that are in contact with the outer surface of the cylindrical part 1 on the side close to the second plane 22 is defined as a first distance E, and the distance between the second plane 22 and one of the reference planes 3 that are in contact with the outer surface of the cylindrical part 1 on the side close to the first plane 21 is defined as a second distance F, the method involves measuring the first distance E and the second distance F, then finding the absolute value of the difference between the two.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a method for measuring the symmetry of a width across face. [Background technology]

[0002] Conventionally, for example, a standard for the "degree of symmetry with respect to the cylindrical portion" has been established for the clamping two-face width shape on the cylindrical body of a workpiece.

[0003] There are few known techniques for measuring the two-face width, but for example, Patent Document 1 discloses an "apparatus for measuring the two-face width of a regular polyhedron." However, there is no known technique for measuring the "degree of symmetry" of the two-face width shape. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-145052 A Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned two-sided shape has a huge variation in dimensions because the outer diameter and longitudinal dimension of the cylindrical part, the thickness of the two-sided width, and the longitudinal position relative to the cylindrical part are determined according to the shape of the device where the workpiece is mounted. Therefore, in order to measure the "symmetry relative to the cylindrical part", it is necessary to prepare a dedicated tool for each dimensional variation, which inevitably increases the manpower and labor required.

[0006] The present invention was created in consideration of these problems, and its purpose is to provide a method for easily measuring the symmetry of a two-face width portion of a workpiece that includes a cylindrical portion having a constant diameter along an axis with respect to the two-face width portion. [Means for solving the problem]

[0007] A first aspect of the present invention is a method for measuring the symmetry of a two-face width portion of a workpiece with respect to a cylindrical portion, the two-face width portion including a cylindrical portion (1) having a constant diameter along an axis (Z), the two-face width portion including a first surface (21) and a second surface (22) and the two-face width portion including a cylindrical portion (1) having a constant diameter along an axis (Z), the two-face width portion including a first surface (21) and a second surface (22) and the two-face width portion including a second surface (22) and the two-face width portion including a second surface (22) and the two-face width portion including a first surface (22) and the ... second surface (22) and the two-face width portion including a second surface (22) and the two-face width portion including a first surface (22)

[0008] A second aspect of the present invention is a method for measuring the symmetry of a two-face width portion of a workpiece with respect to a cylindrical portion, the two-face width portion including a cylindrical portion (1) having a constant diameter along an axis (Z), the two-face width portion including a two-face width portion (2) having one face designated as a first face (21) and the other face designated as a second face (22), the two-face width portion including a cylindrical portion (1) having a constant diameter along an axis (Z), the two-face width measurement method comprising the steps of: defining a plane that is parallel to the first and second faces and that includes the axis of the cylindrical portion as a cylindrical portion center plane (100); defining the distance between the first face and the cylindrical portion center plane as distance A (A); defining the distance between the second face and the cylindrical portion center plane as distance B (B); and defining the top-bottom direction with respect to a groove portion (4) formed so that two planes of the same width intersect with each other at the same angle when the groove portion is horizontal as a vertical direction (G), the first face or the second face is parallel to the vertical direction and the cylindrical portion of the workpiece is placed in the groove portion so that it is in contact with the axis, measuring distance A and distance B, and determining the absolute value of the difference between the two values.

[0009] This makes it possible to easily measure the symmetry of the workpiece's two-face width portion relative to the cylindrical portion. [Brief description of the drawings]

[0010] [Figure 1] FIG. 13 is a side view of the workpiece with its two flats clamped. [Diagram 2] Plan view of Figure 1. [Diagram 3] Front view of Figure 1. [Figure 4] 3A to 3C are schematic diagrams illustrating a method for measuring the width across face symmetry according to the first embodiment. [Diagram 5]FIG. 1 is a schematic diagram illustrating a method for measuring the width across flat symmetry according to a second embodiment. [Figure 6] FIG. 2 is a schematic diagram illustrating a method for measuring the width across flat symmetry according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Applies to Several embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, an engine injector is assumed as the workpiece W. An application of the present invention is shown in Fig. 1-3. A clamping two-face width portion is provided on the cylindrical body of an engine injector component with axis Z as the center line, and an arm A gripping the two-face width portion 2 as shown in Fig. 1-3 attaches it to the engine.

[0012] [Symmetry of width across flats] Here, when the injector is inserted into the mounting hole based on the width across flats, even if the standards for the coaxiality and straightness of the cylindrical part are met, if the symmetry of the width across flats is not as shown in the drawing, the tip of the nozzle part may come into contact with the inner wall of the hole and be damaged. For this reason, the drawing specifies that the symmetry with respect to the outer diameter of the cylinder of the body should be 0.1 mm. The symmetry of the width across flats is defined as the amount of deviation from the symmetrical position of the bodies that should be symmetrical with respect to the datum axis line or datum central plane. Applying this to the drawing specification, it is sufficient that the actual "center plane of the width across flats" of the workpiece W is within a range of ±0.05 mm from the ideal "datum central plane" (a plane that is parallel to the width across flats 2 and includes the axis Z of the workpiece W).

[0013] (First embodiment) First, a second aspect (first embodiment) of the present invention will be described, in which the degree of symmetry is obtained by measuring the distance between the datum center plane of the workpiece W and each face of the width across flats from the datum center plane.

[0014] An outline of the first embodiment is shown in Fig. 4. This is a method for measuring the degree of symmetry S of a two-face width portion 2 of a workpiece W, which includes a cylindrical portion 1 having a constant diameter along an axis Z, and which includes a two-face width portion 2 having a first surface 21 and a second surface 22 as the other surface.

[0015] A plane parallel to the first surface 21 and the second surface 22 and including the axis Z of the cylindrical portion 1 is defined as the cylindrical portion center surface 100, the distance between the first surface 21 and the cylindrical portion center surface 100 is defined as the A distance A, and the distance between the second surface 22 and the cylindrical portion center surface 100 is defined as the B distance B. Furthermore, the top-bottom direction with respect to the groove portion 4 when the groove portion 4, which is formed so that two planes of the same width intersect with each other at the same angle, is horizontal is defined as the up-down direction G.

[0016] At this time, the workpiece W is placed in the groove 4 so that the first surface 21 or the second surface 22 is parallel to the vertical direction G and the cylindrical portion 1 of the workpiece W abuts along the axis Z, and distance A A and distance B B are measured with a plane parallel to the vertical direction G including a straight line connecting the deepest parts of the groove 4 as the central plane 100 of the cylindrical portion, and the absolute value of the difference between the two values ​​is calculated. This absolute value becomes the degree of symmetry S. Thus, the only values ​​that need to be measured in the first embodiment are distance A A and distance B B.

[0017] The explanation will be given with reference to Fig. 4. Fig. 4 is a schematic cross-sectional view of the cylindrical part 1 including the two-face width part 2 of the workpiece W placed on the groove part 4 placed on a horizontal plane, and cut by a plane perpendicular to the axis Z. This groove part 4 is a part of a V-shaped receiving jig formed in a regular V shape so that two planes of the same width intersect each other at the same angle, and if the cylindrical part 1 is placed on the ground horizontally, the straight line connecting the deepest part of the groove part 4 and the axis Z of the cylindrical part 1 will overlap in the vertical direction G in the cross-sectional view, and the plane including both will be found to be the datum center plane. Therefore, it is only necessary to measure the distance between the cylindrical part center plane 100, which is the obtained datum center plane, and each face of the two-face width part 2, i.e., the A distance A and the B distance B.

[0018] The following will explain this using equations with reference to FIG. <Definition 1.1> The thickness of the two-face width portion 2 is defined as 2R. In this case, R is equal to half the thickness of the two-face width 2 (the distance from each surface of the two-face width portion 2 to the two-face width center plane 200 described later). <Definition 1.2> The central plane of the two-face width portion 2 (a plane parallel to each face of the two-face width portion 2 and equidistant from each face) is defined as the two-face width central plane 200. <Definition 1.3> The distance of the width across flat center plane 200 from the center plane 100 of the cylindrical portion is defined as the amount of misalignment δ (delta).

[0019] In this case, the following (Equation 1.1) and (Equation 1.2) hold. If (Equation 1.2) is transformed into (Equation 1.3), (Equation 1.4) is derived. If the absolute value of the difference between the values ​​of distance A and distance B is taken from this, it becomes the value of the degree of symmetry S (Equation 1.41).

[0020] δ=S / 2 (Formula 1.1) δ = AR (Eq. 1.2) δ = AR = A - [(A + B) / 2] = (AB) / 2 = S / 2 (Eq. 1.3) S=AB (Formula 1.4) S=|AB| (Equation 1.41)

[0021] [Effects of the first embodiment] By adopting the first embodiment and introducing a dedicated measuring jig equipped with a groove and a measuring tool, it becomes possible to easily measure the symmetry of the two-face width portion of a workpiece including a cylindrical portion whose diameter is constant along the axis with respect to the two-face width portion, which is useful for suppressing increases in labor and man-hours. In addition, by providing several dimensional variations of the groove portion, which serves as the workpiece receiving portion, and easily replacing them, it is possible to flexibly handle a wide variety of workpieces.

[0022] Second embodiment Next, we will explain a first aspect (second embodiment) of the present invention, which provides a simpler method for determining the symmetry of the two-face width portion 2, by focusing on the fact that even if symmetry measurement is performed faithfully based on the symmetry measurement principle of the first embodiment, the mechanism of the measuring instrument itself does not necessarily have to be configured according to that symmetry measurement principle.

[0023] 5-6 show an outline of the second embodiment. This method is similar to the first embodiment in that it is a method for measuring the symmetry degree S of a two-face width portion 2 of a workpiece W, the two-face width portion 2 having one face as a first face 21 and the other face as a second face 22, and the workpiece W including a cylindrical portion 1 having a constant diameter along an axis Z, with respect to the cylindrical portion 1.

[0024] The surfaces parallel to the first surface 21 and the second surface 22 are collectively referred to as the reference surface 3, and the distance between the first surface 21 and one of the reference surfaces 3 that contacts the outer surface of the cylindrical portion 1 closer to the second surface 22 is defined as a first distance E, and the distance between the second surface 22 and one of the reference surfaces 3 that contacts the outer surface of the cylindrical portion 1 closer to the first surface 21 is defined as a second distance F. The first distance E and the second distance F are measured, and the absolute value of the difference between the two values ​​is found. In this way, the only values ​​that need to be measured in the second embodiment are the first distance E and the second distance F.

[0025] The following description will be given with reference to Fig. 5. As shown in Fig. 5, in the second embodiment, one side (e.g., first side 21) of the two-flat width portion 2 of the workpiece W is placed on the horizontal plane of a receiving jig having a horizontal surface, and the distance between the one side (e.g., first side 21) of the two-flat width portion 2 of the workpiece W and the reference surface 3 that is in contact with the outer surface of the cylindrical portion 1 on the opposite side is obtained (first distance E) (Fig. 5(a)). Next, the cylindrical portion 1 is turned over, the opposite side (e.g., second side 22) of the two-flat width portion 2 is placed, and the same process is repeated (second distance F) (Fig. 5(b)). Finally, the absolute value (|EF|) of the difference between the values ​​of the first distance E and the second distance F is calculated, which is the value of the symmetry degree S.

[0026] The following will explain the formula with reference to Fig. 6. The explanation of the first embodiment (paragraphs

[0018] -

[0020] ) will also be partially referred to. <Definition 2.1> The outer diameter (diameter) of the cylindrical portion 1 is D. <Definition 1.2> Reprinted: The central plane of the two-face width portion 2 (a plane parallel to each face of the two-face width portion 2 and equidistant from each face) is defined as the two-face width central plane 200. <Definition 2.2> The distance from each face of an ideal two-face width portion 2 having a degree of symmetry of 0 (when the two-face width center plane 200 coincides with the cylindrical portion center plane 100) to a reference plane 3 that is tangent to the outer surface of the adjacent cylindrical portion 1 is defined as K. <Definition 1.3> Reprinted The distance of the center plane 200 of the width across flats from the center plane 100 of the cylindrical portion is defined as the amount of misalignment δ (delta).

[0027] At this time, the following (Equation 2.1) and (Equation 2.2) hold. If (Equation 2.1) and (Equation 2.2) are联立 and set as (Equation 2.3), it can be transformed into (Equation 2.4), and (Equation 2.5) is derived. Here, since the re-listed (Equation 1.1) can be transformed into (Equation 1.11), (Equation 2.6) is derived. From this, if the absolute value of the difference between the values of E and F is taken, it is the value of the symmetry degree S (Equation 2.61).

[0028] D = E + δ + K ···(Equation 2.1) D = F - δ + K ···(Equation 2.2) E + δ + K = F - δ + K ···(Equation 2.3) E + δ = F - δ ···(Equation 2.4) 2δ = F - E ···(Equation 2.5) δ = S / 2 ···(Equation 1.1) re-listed 2δ = S ···(Equation 1.11) S = (2δ =) F - E ···(Equation 2.6) S = |E - F| ···(Equation 2.61)

[0029] For example, when "E < F", it can be said that "the symmetry degree S is equal to the length of F when the length of E is 0 (zero)". Therefore, if the second measurement is performed after adjusting the value after the first measurement to the scale zero of the measuring instrument, the measured value can be directly grasped as the value of the symmetry degree S, which is convenient (Figure 5).

[0030] [Effect of the Second Embodiment] By adopting the second embodiment and introducing a simpler dedicated measuring jig equipped with a receiving jig and a measuring instrument, the symmetry degree of the cylindrical part of the two-sided width part of the workpiece including the cylindrical part with a constant diameter along the axis with respect to the two-sided width part can be measured more simply than in the first embodiment, which is useful for suppressing the increase in labor and man-hours. In addition, even if a dedicated measuring jig is manufactured, it saves space and does not take up much space, and it can be used regardless of the dimensional variations of the workpiece, so it has high convenience.

[0031] (Other Embodiments) In the above embodiment, it is assumed that the symmetry measurement is performed manually using a simple dedicated measuring tool, but the embodiment of the present invention is not limited to this. For example, the symmetry measurement may be automated using a robot.

[0032] As described above, the present invention is not limited to the above-described embodiment, and can be embodied in various forms without departing from the spirit of the present invention. [Explanation of symbols]

[0033] 1. Cylindrical part 2... Width across flats part 21...Front page 22...2nd page 3...Reference plane E 1st distance F: Second distance Z...axis

Claims

1. A method for measuring the symmetry of a two-face width portion (2) of a workpiece with respect to a cylindrical portion (1) having a constant diameter along an axis (Z), the two-face width portion having a first surface (21) and a second surface (22) on the other side, the method comprising: A plane parallel to the first plane and the second plane is collectively referred to as a reference plane (3); A distance between the first surface and one of the reference surfaces that is in contact with an outer surface of the cylindrical portion closer to the second surface is defined as a first distance (E); When the distance between the second surface and one of the reference surfaces that is in contact with the outer surface of the cylindrical portion closer to the first surface is defined as a second distance (F), measuring the first distance and the second distance and determining an absolute value of a difference between the two values; A method for measuring two-sided symmetry.

2. A method for measuring the symmetry of a two-face width portion (2) of a workpiece with respect to a cylindrical portion (1) having a constant diameter along an axis (Z), the two-face width portion having a first surface (21) and a second surface (22) on the other side, the method comprising: A plane parallel to the first surface and the second surface and including the axis of the cylindrical portion is defined as a cylindrical portion center plane (100); The distance between the first surface and the center surface of the cylindrical portion is defined as a distance A (A); The distance between the second surface and the center surface of the cylindrical portion is defined as a B distance (B), and When a groove (4) is formed so that two planes of the same width intersect with each other at the same angle and the groove is placed horizontally, the top-bottom direction with respect to the groove is defined as the up-down direction (G). The work is placed in the groove so that the first surface and the second surface are parallel to the up-down direction and the cylindrical portion of the work is in contact with the work along the axis, and the distance A and the distance B are measured to determine an absolute value of a difference between the two values. A method for measuring two-sided symmetry.

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