Mandrel type single-ball gear sample plate

Abstract

The utility model discloses a mandrel type single-ball gear sample plate, which belongs to the technical field of gear sample plates and comprises a mandrel. The chassis is mounted on the mandrel; the detection ball is a round ball, the detection ball is installed at the top of the chassis through a connecting piece, the diameter of the detection ball and the distance between the center of the detection ball and the axis of the mandrel are obtained through pre-calculation, and the circular arc profile of the installed detection ball replaces an involute tooth profile to be used for detection and calibration of a gear measuring instrument. According to the utility model, the circular arc profile of the detection ball is used for replacing an involute profile, and the processing precision of the circular arc profile can reach a nanometer level, so that a high-precision surface profile can be obtained, and the detection and calibration of a high-precision gear measuring instrument can be realized conveniently.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear sample plate technical field, in particular to a mandrel formula single ball gear sample plate. BACKGROUND

[0002] Gear sample plate is the standard physical carrier of gear parameter value, is used for transmitting the value of the gear national measurement standard to all levels of gear measuring instrument, is used for the calibration of gear measuring instrument, thereby realizes the accuracy and consistency of gear measurement, guarantees the gear product quality.

[0003] Involute sample plate is one of gear sample plates, requires having standard involute tooth profile, requires its tooth profile machining precision reaches sub-micron level, and the machining precision of conventional gear machining machine tool is difficult to realize sub-micron level involute tooth profile.This leads to the actual size of the involute tooth profile of the involute sample plate deviates from the theoretical data more, thereby difficult to realize the detection calibration of high-precision gear measuring instrument.

[0004] Therefore, a mandrel formula single ball gear sample plate is provided. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a mandrel formula single ball gear sample plate, aims at solving or improving at least one of the above technical problems.

[0006] To achieve the above object, the utility model provides the following scheme: the utility model provides a mandrel formula single ball gear sample plate, comprising:

[0007] Mandrel;

[0008] Chassis, the chassis is installed on the mandrel;

[0009] Detection ball, the detection ball is spherical, the detection ball is installed on the top of the chassis through connecting piece, the distance between the diameter of the detection ball and the detection ball ball center to the mandrel axis is precalculated, and the arc profile of the installed detection ball is used for the detection calibration of gear measuring instrument instead of involute tooth profile.

[0010] Preferably, a plurality of threaded grooves are arranged on the top of the chassis in the circumferential direction, and the distances from the axes of the plurality of threaded grooves to the mandrel axis are different.

[0011] Preferably, the connecting piece comprises a connecting block fixed to the bottom of the detection ball, a screw rod is fixed to the bottom of the connecting block, the axis of the screw rod passes through the ball center of the detection ball, and the screw rod is screw-connected with the threaded groove.

[0012] Preferably, the mandrel comprises two base sections, a base section, a hole shaft connecting section and a threaded section are sequentially fixed between the two base sections, the diameter of the threaded section is larger than the diameter of the base section, the diameter of the hole shaft connecting section is larger than the diameter of the threaded section, the diameter of the base section is larger than the diameter of the hole shaft connecting section, and the base plate is sleeved on the hole shaft connecting section.

[0013] Preferably, a nut is threadedly connected on the threaded section, and the base plate is clamped between the base section and the nut.

[0014] Preferably, a center hole is formed in the end of each of the two base sections.

[0015] Preferably, an outer ring is fixedly sleeved on each of the two base sections.

[0016] The utility model discloses the following technical effects: processing the detection ball of diameter d, and installing the detection ball on the base plate according to the distance L calculated in advance, at this time, the arc profile of the detection ball is close to the theoretical involute tooth profile of the gear, and has the theoretical deviation value calculated, and the actual deviation value is obtained after the theoretical deviation value is calibrated by the measurement department. The gear measuring instrument is used to measure the arc profile of the detection ball, and the deviation value detected by the gear measuring instrument is compared with the actual deviation value, so that the detection and calibration of the gear measuring instrument are realized.

[0017] The utility model discloses the arc profile of the detection ball is used to replace the involute tooth profile, and the machining precision of the arc profile can reach nanometer level, which is much higher than the machining precision of the involute profile, so that the machining precision of the detection ball is much higher than the machining precision of the involute sample plate, thereby obtaining the surface profile of higher precision, and the detection and calibration of the gear measuring instrument of high precision are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of the present application, are included to provide further understanding of the application and are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and explain them, and do not limit the present application. In the drawings:

[0019] Fig. 1 It is the axonometric drawing of the utility model;

[0020] Fig. 2 It is the explosion drawing of the utility model;

[0021] Fig. 3 It is the structural schematic view of the utility model.

[0022] In the drawings: 1, mandrel; 2, base plate; 3, detection ball; 4, threaded groove; 5, connecting block; 6, screw rod; 7, base section; 8, base section; 9, hole shaft connecting section; 10, threaded section; 11, nut; 12, center hole; 13, outer ring. DETAILED DESCRIPTION

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figs. 1-3 This utility model provides a mandrel-type single-ball gear template, comprising:

[0026] Mandrel 1;

[0027] Chassis 2, chassis 2 is mounted on spindle 1;

[0028] The detection ball 3 is a sphere and is mounted on the top of the chassis 2 via a connector. The diameter of the detection ball 3 and the distance between the center of the detection ball 3 and the axis of the spindle 1 are calculated in advance. After installation, the arc profile of the detection ball 3 replaces the involute tooth profile for the detection and calibration of the gear measuring instrument.

[0029] In this embodiment, the spindle 1 and the chassis 2 are made of bearing steel, and the detection ball 3 is made of ceramic.

[0030] The diameter d of the detection ball 3 and the distance L between the axis of the spindle 1 and the detection ball 3 are obtained in advance through theoretical calculation. The detection ball 3 with a diameter of d is machined according to the obtained data, and the detection ball 3 is installed on the chassis 2 according to the distance L. At this time, the arc profile of the detection ball 3 is close to the theoretical involute tooth profile of the gear, and the theoretical deviation value between the two can be calculated. The theoretical deviation value needs to be calibrated by the metrology department to obtain the actual deviation value.

[0031] The gear measuring instrument is used to measure the position of the arc contour of the test ball 3. The deviation value detected by the gear measuring instrument is compared with the actual deviation value, thereby realizing the detection and calibration of the gear measuring instrument (for example, if the actual deviation value of the position of the arc contour point of the test ball 3 is 5 micrometers, and the deviation value detected by the gear measuring instrument is also 5 micrometers, it shows that the measurement result of the gear measuring instrument is accurate).

[0032] This application replaces the involute tooth profile with the arc profile of the detection ball 3. The machining accuracy of the arc profile can reach the nanometer level, which is much higher than the machining accuracy of the involute profile. Therefore, the machining accuracy of the detection ball 3 is much higher than that of the involute template, thus obtaining a higher precision surface profile, which facilitates the detection and calibration of high-precision gear measuring instruments.

[0033] In some alternative embodiments, the top circumferential of the chassis 2 is provided with a plurality of threaded grooves 4, and the distance from the axis of the plurality of threaded grooves 4 to the axis of the spindle 1 is different for each of them.

[0034] In some alternative embodiments, the connector includes a connecting block 5 fixed to the bottom of the detection ball 3, a screw 6 fixed to the bottom of the connecting block 5, the axis of the screw 6 passing through the center of the detection ball 3, and the screw 6 being threadedly connected to the threaded groove 4.

[0035] By installing detection balls 3 of different diameters at different positions, the detection balls 3 at different positions can replace the involute profiles of gears of different sizes, thereby obtaining single-ball gear templates of various sizes.

[0036] In some optional embodiments, the mandrel 1 includes two base sections 7, and a base section 8, a hole-shaft connecting section 9 and a threaded section 10 are sequentially fixed between the two base sections 7. The diameter of the threaded section 10 is larger than the diameter of the base section 7, the diameter of the hole-shaft connecting section 9 is larger than the diameter of the threaded section 10, the diameter of the base section 8 is larger than the diameter of the hole-shaft connecting section 9, and the chassis 2 is sleeved on the hole-shaft connecting section 9.

[0037] In some alternative embodiments, a nut 11 is threaded onto the threaded section 10, and the chassis 2 is sandwiched between the base section 8 and the nut 11.

[0038] During installation, the chassis 2 is passed through the base section 7 and the threaded section 10 and placed on the base section 8. Then, the nut 11 is threaded onto the threaded section 10 to press the chassis 2, thereby fixing the chassis 2 to the spindle 1.

[0039] In some alternative embodiments, the ends of the two base segments 7 are respectively provided with tip holes 12.

[0040] The upper and lower centers of the gear measuring instrument are inserted into the two center holes 12 respectively to clamp and center the mandrel 1.

[0041] In some alternative embodiments, an outer ring 13 is fixedly fitted onto each of the two base segments 7. The diameter of the outer ring 13 is smaller than the diameter of the threaded segment 10.

[0042] When the axis of the tip hole 12 is not coaxial with the axis of the spindle 1, the position of the rotation axis of the spindle 1 can be determined by measuring the center of the two outer rings 13 and connecting the two centers.

[0043] The diameter d of the detection ball 3 and the distance L between the axis of the mandrel 1 and the detection ball 3 need to be calculated in advance through the following steps:

[0044] 1. Set the parameters of the standard involute gear: number of teeth z, module m.

[0045] 2. Calculate the coordinates of the involute tooth profile points using the following formula:

[0046] x = r b (cosθ+θsinθ).(1)

[0047] y = r b (sinθ-θcosθ). (2)

[0048] In the formula, r b Let θ be the radius of the base circle of the gear, and θ be the involute's unfolding angle.

[0049] 3. Perform least-squares circle fitting on the tooth profile points of the standard involute (least-squares circle fitting is an existing mathematical calculation method, the specifics of which are existing techniques and will not be elaborated here), to obtain the diameter d and center coordinates (x, y) of the least-squares circle. C y C ).

[0050] 4. The distance L between the axis of mandrel 1 and the center of the detection ball 3 is calculated using the following formula:

[0051]

[0052] The diameter d of the detection ball 3 and the distance L between the axis of the mandrel 1 and the center of the detection ball 3 are obtained by optimizing the fitting of the theoretical involute point. The theoretical deviation between the arc of the detection ball 3 and the theoretical involute is minimized, and the detection ball 3 achieves the optimal substitution of the involute.

[0053] Based on the calculated d, a detection ball 3 with a diameter of d is machined, and a threaded groove 4 is opened at the corresponding position of the chassis 2 based on the calculated L.

[0054] In use, the base plate 2 passes through the base section 7 and the threaded section 10, and is placed on the base section 8. A nut 11 is then threaded onto the threaded section 10 to tighten the base plate 2, thereby fixing it to the spindle 1. The upper and lower centers of the gear measuring instrument are inserted into the center holes 12 at both ends of the spindle 1 to clamp and center the spindle 1. A detection ball 3 with a diameter of d is installed on the corresponding threaded groove 4 via a screw 6.

[0055] After calibration by a metrology department, this invention yields the actual deviation between the arc profile of the test ball 3 and the theoretical involute tooth profile of the gear. A gear measuring instrument measures the arc profile of the test ball 3, and the deviation between the position of the arc profile of the test ball 3 measured by the gear measuring instrument and the involute is compared with the actual deviation value, thereby achieving the calibration of the gear measuring instrument.

[0056] This application has the following advantages:

[0057] 1. The template is a mandrel type with 12 top and bottom center holes, which can be directly used for clamping and centering the top and bottom centers of gear measuring instruments, eliminating the need for center alignment and tilt alignment steps.

[0058] 2. The detection ball 3 is a high-precision ceramic ball with a surface shape error on the submicron level, which is far higher than the machining accuracy of the involute profile. Therefore, it can replace the existing involute template to achieve a high-precision surface profile.

[0059] 3. The diameter d of the detection ball 3 and the distance L between the axis of the mandrel 1 and the detection ball 3 are obtained by optimizing the fitting of the theoretical involute points. The theoretical deviation between the arc of the detection ball and the theoretical involute is minimized, and the detection ball achieves the optimal substitution of the involute.

[0060] 4. Multiple detection balls 3 of different sizes can be installed on the template base 2. By adjusting the distance between the axis of the mandrel 1 and the detection ball 3, and the diameter of the detection ball 3, a single ball gear template with various parameters can be integrated on a template.

[0061] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0062] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A mandrel-type single-pinhole gear template, characterized by, The utility model relates to a kind of gear measuring instrument calibration device, including: Core shaft (1); Chassis (2), the chassis (2) is installed on core shaft (1); Detection ball (3), the detection ball (3) is round ball, the detection ball (3) is installed on the top of the chassis (2) by connecting piece, the detection ball (3) diameter and the distance between the detection ball (3) ball center to the axis of the core shaft (1) is precalculated, the detection ball (3) circular arc profile after installation is used to gear measuring instrument detection calibration instead of involute tooth profile.

2. The mandrel single lobe gear template of claim 1, wherein: Multiple thread grooves (4) are opened in the top of the chassis (2) circumferentially, and the axes of multiple thread grooves (4) are different from the axis of the core shaft (1).

3. The mandrel single lobe gear template of claim 2, wherein: The connecting piece includes connecting block (5) fixed in the bottom of the detection ball (3), screw rod (6) is fixed in the bottom of the connecting block (5), the axis of the screw rod (6) passes through the ball center of the detection ball (3), and the screw rod (6) is screwed with the thread groove (4).

4. The mandrel single lobe gear template of claim 1 wherein: The core shaft (1) includes two basic sections (7), and base section (8), hole shaft connecting section (9) and threaded section (10) are sequentially fixed between two basic sections (7), the diameter of the threaded section (10) is greater than the diameter of the basic section (7), the diameter of the hole shaft connecting section (9) is greater than the diameter of the threaded section (10), the diameter of the base section (8) is greater than the diameter of the hole shaft connecting section (9), and the base section (8) is sleeved on the hole shaft connecting section (9).

5. The mandrel single lobe gear template of claim 4 wherein: Nut (11) is screwed on the threaded section (10), and the chassis (2) is clamped between the base section (8) and the nut (11).

6. The mandrel single lobe gear template of claim 4 wherein: The end of two basic sections (7) is respectively provided with center hole (12).

7. The mandrel single lobe gear template of claim 4 wherein: Two outer rings (13) are respectively fixed on two basic sections (7).

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