An inner spline first tooth symmetry control device and method

Abstract

The application belongs to the field of helicopters, and particularly relates to an inner spline first tooth symmetry control device and method. The device comprises a pressing mechanism, a positioning pin A, a stand, a bottom plate, a gear shaping test piece, a positioning pin B, and a four-claw clamping plate. The bottom plate is a disc structure, and the surface is uniformly provided with four T-shaped grooves for placing the pressing mechanism. The pressing mechanism can move along the T-shaped groove, and the pressing mechanism is fixed on the bottom plate by a screw. The application can avoid the risk of gear shaping of the key first tooth symmetry of the central part of the moving part, is suitable for the control of the initial angle position of various splines, and can be popularized in the industry.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of helicopters, and particularly relates to a device and method for controlling symmetry of a first tooth of internal splines. BACKGROUND

[0002] A central part of a certain type of helicopter is a key load-bearing moving part, and the machining quality of the symmetry of the first tooth of the spline directly relates to the relative position of the blade installation and affects the safety of the flight of the tool. The position of the first tooth of the spline and the symmetry of YY' are 0.2 mm, YY' is an initial spline groove symmetry axis, and specific structures are shown in the following figure:

[0003] Technical difficulties faced are:

[0004] 1. Because the generating method is used for machining the spline in the spline machining, the first tooth angle of the gear shaping tool cannot be accurately controlled;

[0005] 2. Because the YY' axis is a space axis in the spline machining, the YY' axis cannot be aligned. SUMMARY

[0006] TECHNICAL SCHEME

[0007] A device for controlling the symmetry of the first tooth of internal splines comprises a pressing mechanism 2, a positioning pin A 6, a stand 8, a bottom plate 12, a gear shaping test piece 13, a positioning pin B 14, a four-jaw clamping plate 16, the bottom plate 12 is a disc structure, and four T-shaped grooves are uniformly distributed on the surface for placing the pressing mechanism 2, the pressing mechanism 2 can move along the T-shaped groove, and the pressing mechanism 2 is fixed on the bottom plate 12 by screws,

[0008] The stand 8 is four, is fixed on the bottom plate 12 by bolts, and is alternately distributed with the pressing mechanism 2. The machining workpiece 1 is installed in the area enclosed by the stand 8 and the pressing mechanism 2, and is fixed by adjusting the position of the pressing mechanism 2 on the bottom plate 12 to press the root of the machining workpiece 1 outside the lace. The gear shaping test piece 13 is attached to the machining workpiece 1, and is positioned by the positioning pin A 6 on the machining workpiece 1. Two positioning pins B 14 are arranged on the gear shaping test piece 13 and symmetrically distributed on the circumferential direction of the gear shaping test piece 13. The four-jaw clamping plate 16 is pressed on the gear shaping test piece 13 and positioned on the stand 8 by screws.

[0009] Further, the positioning holes on the gear shaping test piece 13 are two, and the positions are determined according to the positions of the positioning pin A 6 on the machining workpiece 1.

[0010] Further, the four-jaw clamping plate 16 is provided with a hole for avoiding the positioning pin B 14.

[0011] Further, the bottom plate 12 is made of cast iron.

[0012] Further, the strength and toughness of the pressing mechanism 2 should be ensured.

[0013] Further, the pressing mechanism 2 is specifically in L configuration.

[0014] Further, the small diameter of the gear shaping test piece 13 should be consistent with the small diameter of the internal spline of the workpiece 1. The machining quality of the workpiece 1 can be ensured.

[0015] A method for controlling the symmetry of the first tooth of internal spline, comprising the following steps

[0016] Step 1: align the workpiece 1 to the center of rotation of the gear shaping machine, with a runout of not more than 0.02mm, and fix the workpiece 1 with the pressing mechanism 2;

[0017] Step 2: determine the position of the gear shaping test piece 13 in the workpiece 1 through the positioning pin 6A, and fix the gear shaping test piece 13 through the four-jaw pressing plate 16;

[0018] Step 3: align the two positioning pins B14 on the gear shaping test piece 13, so that the center line of the two positioning pins is parallel to the X-axis of the machine tool, with an error of not more than 0.01mm, and realize the reference conversion through the two groups of positioning holes on the gear shaping test piece 13, so as to confirm the parallelism between the reference of the workpiece 1 and the X-axis of the gear shaping machine.

[0019] Step 4: install the gear shaping cutter on the machine tool, confirm and record the cutter installation angle C1 value;

[0020] Step 5: align the two positioning pins B14 on the gear shaping test piece 13, so that the center line of the two positioning pins is parallel to the X-axis of the machine tool, with an error of not more than 0.01mm, and realize the reference conversion through the two groups of positioning holes on the gear shaping test piece 13, so as to confirm the parallelism between the reference of the workpiece 1 and the X-axis of the gear shaping machine.

[0021] Step 6: process the internal spline of the gear shaping test piece 13 when the cutter angle is C1 value;

[0022] Step 7: after the gear shaping test piece 13 is processed, use the three-coordinate equipment to measure the symmetry of the first tooth and the two positioning pins B14, and the measurement results are SCN1 and SCN2.

[0023] Step 8 When the measurement result meets the drawing requirement, spline machining can be performed on the workpiece, and when the measurement result does not meet the drawing requirement: the tool rotation angle θ is calculated according to the measurement results (SCN1, SCN2), and the calculation formula is θ = arctan {(the positive value in SCN-the negative value in SCN) / 2R2}, if SCN1 is positive, the tool rotates counterclockwise by θ degrees, and if SCN1 is negative, the tool rotates clockwise by θ degrees. The tool rotation angle θ is compensated into the machine tool gear cutting tool angle, and the original tool angle C1 value ± tool rotation angle θ is reinstalled and the gear cutting test piece 13 is machined. Until the first tooth of the gear cutting test piece 13 and the two positioning pins B14 are symmetrical to meet the requirement.

[0024] Technical effects

[0025] The present application solves the problems that the gear cutting tool cannot accurately control the first tooth angle of the tool and the workpiece cannot be aligned with the YY' axis in spline machining using the expansion method to machine the spline. The present application can avoid the risk of symmetrical gear cutting of the key first tooth of the central part of the moving part, control the start angle position of various splines, and can be popularized in the industry. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the control device as a whole;

[0027] Figure 2 It is a schematic diagram of the assembly of the control device;

[0028] Figure 3 It is a schematic diagram of the overall cooperation of the control device and the parts;

[0029] Among them:

[0030] 1 workpiece, 2-5 pressing mechanism, 6-7 positioning pin A (φ6h7), 8-11 column, 12 bottom plate, 13 gear cutting test piece, 14-15 positioning pin B (φ10h7), 16, four-jaw clamping plate, 17-20 screw.

[0031] Figure 4 It is a schematic diagram of the calculation formula. DETAILED DESCRIPTION

[0032] The present application will be further described below in conjunction with the embodiments. The following description is only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Based on the structure of workpiece 1, and using the φ6H7 positioning hole on the workpiece as a reference, a gear-shaping test piece 13 is designed. The test piece 13 has two sets of positioning holes, φ6H7 and φ10H7 respectively. The position of the φ6H7 positioning hole on the test piece 13 on the workpiece 1 is determined by positioning pin A. The center of the φ10H7 positioning hole on the test piece 13 is on the (YY') axis of the workpiece 1. After the position of the gear-shaping test piece 13 is determined, it is fixed to the workpiece 1 by a four-jaw clamping plate 16 and four screws. Two positioning pins B14 are installed in the φ10H7 positioning holes on the gear-shaping test piece 13.

[0034] After the gear shaping test piece 13 is installed, align the center line of the locating pin B14 (φ10h7) with the X-axis of the gear shaping machine. This confirms the angular orientation of the workpiece 1 and that the axis of the workpiece 1 (YY') is parallel to the X-axis of the gear shaping machine. The gear shaping machine first processes the internal splines on the gear shaping test piece 13. A coordinate measuring machine is used to measure the symmetry of the internal splines on the gear shaping test piece 13. Based on the symmetry measurement, the rotation angle of the gear shaping tool is calculated. The tool angle is adjusted, and the gear shaping test piece 13 is processed until the symmetry meets the requirements of the workpiece 1. Only then can the spline machining of the workpiece 1 begin.

[0035] 1. Align the workpiece 1 to the rotation center of the gear hobbing machine, ensuring the runout is no more than 0.02mm, and use the clamping mechanism 2 to fix the workpiece 1.

[0036] 2. The position of the gear shaping test piece 13 on the workpiece 1 is determined by the positioning pin 6A (φ6h7), and the gear shaping test piece 13 is fixed by the four-jaw clamping plate 16;

[0037] 3. Align the two locating pins B14 (φ10h7) on the gear shaping test piece 13 so that the line connecting the centers of the two locating pins is parallel to the X-axis of the machine tool with an error of no more than 0.01mm. The reference conversion is achieved through the two sets of locating holes on the gear shaping test piece 13, and the parallelism between the reference (YY`) of the workpiece 1 and the X-axis of the gear shaping machine tool can be confirmed.

[0038] 4. Install the gear hobbing tool on the machine tool, confirm and record the tool installation angle C1 value;

[0039] 5. Align the two locating pins B14 (φ10h7) on the gear shaping test piece 13. The line connecting the centers of the two locating pins should be parallel to the X-axis of the machine tool with an error of no more than 0.01mm. The reference conversion can be achieved through the two sets of locating holes on the gear shaping test piece 13. The parallelism between the reference (YY`) of the workpiece 1 and the X-axis of the gear shaping machine tool can be confirmed.

[0040] 6. When the tool angle is at C1, machine the spline inside the gear shaping test piece 13;

[0041] 7、After the gear shaping test piece 13 is processed, the three-coordinate equipment is used to measure the symmetry of the first tooth and the two positioning pins B14 (φ10h7), and the measurement results are SCN1 and SCN2.

[0042] 8、When the measurement results meet the drawing requirements, the spline processing of the processed workpiece can be performed, and when the measurement results do not meet the drawing requirements: the tool rotation angle θ is calculated according to the measurement results (SCN1 and SCN2), and the calculation formula is θ = arctan {(the positive value in SCN-the negative value in SCN) / 2R2}. If SCN1 is positive, the tool is counterclockwise rotated by θ degrees, and if SCN1 is negative, the tool is clockwise rotated by θ degrees. The tool rotation angle θ is compensated into the gear shaping tool angle of the machine tool, and the original tool angle C1 value ± tool rotation angle θ is reinstalled and the gear shaping test piece 13 is processed.

[0043] Until the symmetry of the first tooth of the gear shaping test piece 13 and the two positioning pins B14 (φ10h7) meets the requirements.

[0044] Calculation formula: θ = arctan {(the positive value in SCN-the negative value in SCN) / 2R2}

[0045] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and unless defined as such, should not be interpreted to have idealized or overly formal meanings. The above specific embodiments further illustrate the purposes, technical solutions and beneficial effects of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An inner spline first tooth symmetry control device characterized by, The utility model relates to a kind of insert gear test piece positioning device, including pressing mechanism, positioning pin A, column, bottom plate, insert gear test piece, positioning pin B, four-jaw clamping plate, the bottom plate is disc structure, surface is evenly distributed four T-shaped grooves for placing the pressing mechanism, the pressing mechanism can be moved along T-shaped groove groove type, and the pressing mechanism is fixed on the bottom plate using screw, The column is four, bolted on the bottom plate, and is alternately distributed with the pressing mechanism;Workpiece is installed in the area enclosed by the column and the pressing mechanism, and by adjusting the position of the pressing mechanism on the bottom plate, the root of the outer edge of the workpiece is pressed, so as to fix the workpiece;Insert gear test piece is attached to the workpiece, and is positioned by positioning pin A on the workpiece;Two positioning pins B are provided on the insert gear test piece, symmetrically distributed on the circumference of the insert gear test piece;The four-jaw clamping plate is pressed on the insert gear test piece, and is positioned on the column by screw;In use, the steps include: Step 1 align the workpiece to the center of rotation of the gear cutting machine, with a runout of not more than 0.02 mm, and fix the workpiece with the pressing mechanism; Step 2 determine the position of the insert gear test piece on the workpiece by positioning pin A, and fix the insert gear test piece with the four-jaw clamping plate; Step 3 align the two positioning pins B on the insert gear test piece, with the center line of the two positioning pins parallel to the X-axis of the machine tool, and the error not more than 0.01 mm, and perform reference conversion through the two sets of positioning holes on the insert gear test piece to confirm the parallelism of the workpiece reference and the X-axis of the gear cutting machine; Step 4 install the gear cutting tool on the machine tool and confirm and record the tool installation angle C1 value; Step 5 align the two positioning pins B on the insert gear test piece, with the center line of the two positioning pins parallel to the X-axis of the machine tool, and the error not more than 0.01 mm, and perform reference conversion through the two sets of positioning holes on the insert gear test piece to confirm the parallelism of the workpiece reference and the X-axis of the gear cutting machine; Step 6 process the internal spline of the insert gear test piece when the tool angle is C1 value; Step 7 after the insert gear test piece is processed, use a three-coordinate device to measure the symmetry of the first tooth and the two positioning pins B, and the measurement results are SCN1 and SCN2; Step 8 when the measurement results meet the drawing requirements, process the spline of the workpiece, and when the measurement results do not meet the drawing requirements: calculate the tool rotation angle θ according to the measurement results (SCN1 and SCN2), the calculation formula is θ = arctan {(the positive value in SCN - the negative value in SCN) / 2R2}, if SCN1 is positive, rotate the tool counterclockwise by θ degrees, if SCN1 is negative, rotate the tool clockwise by θ degrees;Compensate the tool rotation angle θ into the gear cutting tool angle of the machine tool, reinstall the original tool angle C1 value ± tool rotation angle θ and process the insert gear test piece;Until the symmetry of the first tooth and the two positioning pins B of the insert gear test piece meets the requirements.

2. A device for controlling the symmetry of the first tooth of an internal spline according to claim 1, characterized in that The positioning holes on the insert gear test piece are two, and the positions are determined according to the positions of the positioning pins A on the workpiece.

3. An inner spline primary tooth symmetry control device according to claim 2, wherein The four-jaw clamping plate is provided with a clearance hole for the positioning pin B.

4. An inner spline primary tooth symmetry control device according to claim 3, wherein The bottom plate is made of cast iron.

5. An inner spline primary tooth symmetry control device according to claim 4, wherein The strength and toughness of the pressing mechanism should be guaranteed.

6. An inner spline primary tooth symmetry control device according to claim 5, wherein The pressing mechanism is in L configuration.

7. An inner spline primary tooth symmetry control device according to claim 6, wherein The pinion test piece small diameter should be consistent with the small diameter of the internal spline of the workpiece. The pinion test piece small diameter should be consistent with the small diameter of the internal spline of the workpiece.

Images