Spiral elastic element correction device and correction method

Abstract

A spiral elastic element correcting device comprises a round base plate, a correcting sliding block groove extending in the radial direction of the outer circumference of the base plate is formed in the round base plate, a correcting sliding block is arranged in the correcting sliding block groove, the length of the correcting sliding block is smaller than that of the correcting sliding block groove, and a cavity is formed in the middle of the correcting sliding block. The correcting arm mounting base is a receding space for the correcting arm mounting base, a first correcting arm and a second correcting arm are hinged to the correcting arm mounting base, a sliding groove axially penetrating through the correcting arms is formed in the first correcting arm and the second correcting arm, a limiting sliding block is arranged in the sliding groove, and two second pins used for fixing elements are arranged on the limiting sliding block. A correction screw rod is arranged at the lower end of the correction sliding block groove, the correction screw rod axially penetrates through the correction sliding block groove and is connected with the lower end of the correction sliding block, a semispherical rotating block is arranged between the correction sliding block and the correction screw rod, and a first pin used for correcting an element is arranged in the middle of the upper end of the correction sliding block.

Description

Technical Field

[0001] The invention relates to the field of engineering technology, and in particular to a spiral elastic element correction device and a correction method. Background Art

[0002] Spiral elastic elements are widely used in aerospace, instrumentation, nuclear power and other fields. With the replacement of major equipment, higher requirements are put forward for the quality of elastic element products, and the dimensional accuracy requirements are getting higher and higher. The dimensional accuracy of elastic elements includes two aspects, external dimensions and structural dimensions. External dimensions mainly include parameters such as outer diameter (inner diameter), element thickness, flat wire width and opening, which are easy to control in this technical field. Structural dimensions include misalignment, butterfly shape, etc. The misalignment refers to the maximum radial misalignment between two circles (taking two circles as an example) of the elastic element in the free state, which seriously affects the appearance quality and high reliability of the product. There are many factors leading to this defect, such as poor consistency of flat belt size, mismatch of spring winding tooling, and unreasonable subsequent shaping process. Misalignment defects can usually be eliminated through subsequent processing, such as the patents with announcement numbers CN 213319720 U and CN213835462U, which are eliminated by shaping with auxiliary devices or tooling. However, for some materials that are sensitive to heat treatment process parameters and have high process requirements, the misalignment defects cannot be fully eliminated under the extreme temperature and time specified in the heat treatment process, resulting in the structural dimensions of the finished components being scrapped due to the misalignment exceeding the index value. Due to the special position of the flat strip at the opening, the misalignment is most likely to occur and is the most serious, which is one of the main reasons for product scrapping. Summary of the invention

[0003] The purpose of the present invention is to provide a spiral elastic element correction device and correction method to address the corresponding deficiencies of the prior art. The spiral elastic element correction device and correction method can correct the spiral elastic element with misalignment defects at room temperature, thereby solving the problem of low yield of the spiral elastic element due to misalignment defects.

[0004] The objective of the present invention is achieved by adopting the following scheme: a spiral elastic element correction device comprises a circular chassis, a correction slider groove extending radially along the outer circumference of the chassis is arranged in the circular chassis, a correction slider is arranged in the correction slider groove, the length of the correction slider is less than the length of the correction slider groove, a cavity is arranged in the middle of the correction slider, which is a makeshift space for the correction arm mounting seat, a first correction arm and a second correction arm are hinged on the correction arm mounting seat, a slide groove axially penetrating the correction arm is arranged on the first correction arm and the second correction arm, a limiting slide groove is arranged in the slide groove, two second pins for fixing the element are arranged on the limiting slide, a correction screw is arranged at the lower end of the correction slider groove, the correction screw axially penetrates the correction slider groove and is connected to the lower end of the correction slider, a hemispherical rotating block is arranged between the correction slider and the correction screw, and a first pin for the correction element is arranged in the middle of the upper end of the correction slider.

[0005] A plurality of threaded holes are symmetrically arranged on both sides of the slide slot of the first correction arm, the limit slider is connected and fixed to the slide slot by fastening screws, a clearance gap is arranged at the lower end of the slide slot, a through hole is arranged at the lower end of the first correction arm, and a plurality of threaded holes are symmetrically arranged on both sides of the slide slot of the second correction arm, the limit slider is connected and fixed to the slide slot by fastening screws, a through hole is arranged at the lower end of the slide slot, a clearance gap is arranged at the lower end of the second correction arm, the screws pass through the through holes arranged on the first correction arm and the second correction arm, and the first correction arm and the second correction arm are hinged on the correction arm mounting seat.

[0006] The upper end surfaces of the first correction arm and the second correction arm are both provided with size scales, the upper ends of the slide grooves of the first correction arm and the second correction arm are both provided with an indication notch, and the extended lines of the central axes of the first correction arm and the second correction arm intersect at the center of the chassis.

[0007] Angle size scales are arranged on the upper end surface of the chassis.

[0008] A spiral elastic element correction method based on a spiral elastic element correction device comprises the following steps:

[0009] 1) Measure the maximum dislocation amount and position of the spiral elastic element with dislocation defects;

[0010] 2) Calculate the correction amount based on the maximum misalignment and position measured;

[0011] 3) Calculate the elastic recovery amount according to the outer diameter, flat belt width and thickness, yield strength and elastic modulus of the spiral elastic element with dislocation defects;

[0012] 4) Fixing the spiral elastic element with the dislocation defect in the limit slider on the spiral elastic element correction device, and calculating the displacement of the correction screw according to the calculated correction amount and springback amount;

[0013] 5) Rotate the correction screw on the spiral elastic element correction device so that the correction screw drives the correction slider to move upward by the calculated displacement;

[0014] 6) Rotate the correction screw on the spiral elastic element correction device to drive the correction slider to move downward until the first pin on the correction slider no longer contacts the spiral elastic element, remove the spiral elastic element, and obtain a spiral elastic element without dislocation defects.

[0015] The calculation formula of the correction amount in step 2) is as follows:

[0016]

[0017] Wherein, L is the correction amount of the spiral elastic element with misalignment defect, mm; W is the maximum misalignment of the spiral elastic element with misalignment defect, mm; α is the angle formed by the line connecting the axis of the second correction arm and the axis of the correction slider with the center of the chassis, °; θ is the position of the maximum misalignment, °.

[0018] Step 3) The calculation formula for the hit rate is as follows:

[0019]

[0020] Where Δρ is the springback amount of the spiral elastic element correcting the dislocation defect, mm; ρ0 is the radius of curvature of the neutral layer of the spiral elastic element correcting the dislocation defect, Where Φ is the outer diameter of the spiral elastic element, mm; t is the width of the flat belt, mm; E is the elastic modulus, MPa; I is the moment of inertia of the flat belt section, Where b is the flat belt thickness, mm; M is the unloading bending moment, Where m is the relative bending moment, S is the static moment of the flat belt section, W is the cross-sectional modulus of the flat belt, F is the hardening index of the material; σ s is the yield strength of the flat belt, MPa.

[0021] The calculation formula for the displacement of the correction screw in step 4) is as follows:

[0022] S=L+Δρ

[0023] Wherein, S is the displacement of the correction screw, mm; L is the correction amount of the spiral elastic element for correcting the misalignment defect, mm; Δρ is the recovery amount of the spiral elastic element for correcting the misalignment defect, mm.

[0024] The advantages of the present invention are: 1. The correction method of the present invention accurately calculates the correction amount and the elastic recovery amount according to the maximum misalignment amount, the flat belt width, the flat belt thickness, the outer diameter of the spiral elastic element, the material yield strength and the elastic modulus parameters, and the misalignment defect of the corrected spiral elastic element is significantly eliminated, which greatly improves the structural dimensional accuracy and appearance quality of the spiral elastic element;

[0025] 2. The present invention is suitable for the correction of elastic elements formed by winding flat belts of different materials and specifications, and has a wide range of uses. At the same time, the correction at room temperature ensures that the performance of the spiral elastic element is stable and does not change;

[0026] 3. The correction device in the present invention has a simple structure, simple method of use and is easy to master. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the correction device in the present invention;

[0028] Figure 2 It is a cross-sectional view of the correction device along the AA direction;

[0029] Figure 3 It is a schematic diagram of the structure of the first correction arm in the present invention;

[0030] Figure 4 It is a cross-sectional view of the first correction arm in the CC direction;

[0031] Figure 5 It is a schematic diagram of the structure of the second correction arm in the present invention;

[0032] Figure 6 It is a cross-sectional view of the second correction arm in the DD direction;

[0033] Figure 7 It is a schematic diagram of the structure of the spiral elastic element in the present invention;

[0034] Figure 8 It is a cross-sectional view of the spiral elastic element along the EE direction;

[0035] Fig. 9 It is an enlarged schematic diagram of elastic element I. DETAILED DESCRIPTION

[0036] See also Figures 1 to 9A spiral elastic element correction device comprises a circular chassis 6, and an angle dimension scale is set on the upper surface of the chassis 6. A correction slider groove 12 extending radially along the outer circumference of the chassis is set in the circular chassis 6, and a correction slider 2 is set in the correction slider groove 12. The length of the correction slider 2 is less than the length of the correction slider groove 12. A cavity is set in the middle of the correction slider 2 to make way for a correction arm mounting seat 13. The correction arm mounting seat 13 is hinged to a first correction arm 5 and a second correction arm 9. The first correction arm 5 and the second correction arm 9 are provided with a slide groove 14 axially penetrating the correction arm. A limit slider 4 is set in the slide groove 14. Two second pins 8 for fixing the element 3 are set on the limit slider 4. A plurality of threaded holes are symmetrically set on both sides of the slide groove 14 of the first correction arm 5. 17, which is convenient for adjusting the position of the limit slider 4. The limit slider 4 is connected and fixed to the slide groove 14 by a fastening screw 16. A clearance gap 19 is set at the lower end of the slide groove 14, and a through hole 15 is set at the lower end of the first correction arm 5. A plurality of threaded holes 17 are symmetrically set on both sides of the slide groove 14 of the second correction arm 9, which is convenient for adjusting the position of the limit slider 4. The limit slider 4 is connected and fixed to the slide groove 14 by a fastening screw 16. A through hole 15 is set at the lower end of the slide groove 14, and a clearance gap 19 is set at the lower end of the second correction arm 9. The screw 10 passes through the through hole 15 set on the first correction arm 5 and the second correction arm 9, and the first correction arm 5 and the second correction arm 9 are hinged on the correction arm mounting seat 13. The upper end surfaces of the first correction arm 5 and the second correction arm 9 are both provided with size scales, and the upper ends of the slide grooves 14 of the first correction arm 5 and the second correction arm 9 are both provided with a numbering notch 18, and the extended lines of the central axis of the first correction arm 5 and the second correction arm 9 intersect at the center of the circle of the chassis 6. A correction screw 1 is provided at the lower end of the correction slider groove 12, and the correction screw 1 axially penetrates the correction slider groove 12 and is connected to the lower end of the correction slider 2. A hemispherical rotating block 11 is provided between the correction slider 2 and the correction screw 1, so as to facilitate the movement of the correction slider 2 when the correction screw 1 rotates. A first pin 7 for the correction element 3 is provided in the middle of the upper end of the correction slider 2.

[0037] A spiral elastic element correction method based on a spiral elastic element correction device comprises the following steps:

[0038] 1) Measure the maximum misalignment and position of the spiral elastic element with misalignment defects; use a precision image measuring instrument to measure the maximum misalignment and position of the spiral elastic element. The maximum misalignment position is represented by an angle θ, that is, the angle formed by the line connecting the starting misalignment position and the maximum misalignment position with the center of the element.

[0039] 2) Calculate the correction amount based on the maximum misalignment and position measured; the calculation formula for the correction amount is as follows:

[0040]

[0041] Wherein, L is the correction amount of the spiral elastic element with misalignment defect, mm; W is the maximum misalignment of the spiral elastic element with misalignment defect, mm; α is the angle formed by the line connecting the axis of the second correction arm and the axis of the correction slider with the center of the chassis, °; θ is the position of the maximum misalignment, °.

[0042] 3) The springback amount is calculated based on the outer diameter, flat belt width and thickness, yield strength and elastic modulus of the spiral elastic element with dislocation defects. The springback amount is calculated as follows:

[0043]

[0044] Where Δρ is the springback amount of the spiral elastic element correcting the dislocation defect, mm; ρ0 is the radius of curvature of the neutral layer of the spiral elastic element correcting the dislocation defect, Where Φ is the outer diameter of the spiral elastic element, mm; t is the width of the flat belt, mm; E is the elastic modulus, MPa; I is the moment of inertia of the flat belt section, Where b is the flat belt thickness, mm; M is the unloading bending moment, Where m is the relative bending moment, S is the static moment of the flat belt section, W is the cross-sectional modulus of the flat belt, F is the hardening index of the material; σ s is the yield strength of the flat belt, MPa.

[0045] 4) The spiral elastic element with the dislocation defect is fixed in the limit slider on the spiral elastic element correction device, and the displacement of the correction screw is calculated according to the calculated correction amount and springback amount; the calculation formula of the displacement of the correction screw in step 4) is as follows:

[0046] S=L+Δρ

[0047] Wherein, S is the displacement of the correction screw, mm; L is the correction amount of the spiral elastic element for correcting the misalignment defect, mm; Δρ is the recovery amount of the spiral elastic element for correcting the misalignment defect, mm.

[0048] 5) Rotate the correction screw on the spiral elastic element correction device so that the correction screw drives the correction slider to move upward by the calculated displacement;

[0049] 6) Rotate the correction screw on the spiral elastic element correction device to drive the correction slider to move downward until the first pin on the correction slider no longer contacts the spiral elastic element, remove the spiral elastic element, and obtain a spiral elastic element without dislocation defects.

[0050] When the correction device is used to correct the spiral elastic element, the maximum misalignment and position are measured, and the correction amount, the springback amount and the correction screw displacement are calculated according to the maximum misalignment. First, the first correction arm is adjusted so that the angle formed by the central axis of the first correction arm and the central axis of the correction slider and the center of the chassis is α, and the second correction arm is adjusted so that the angle formed by the central axis of the second correction arm and the correction slider and the center of the chassis is α. The upper surface of the chassis is provided with an angle size scale, and the angle is determined by the indicating notch provided at the upper end of each correction arm.

[0051] According to the size scale set on the first correction arm, adjust the position of the upper limit slider of the first correction arm so that the size scale of its position is the radius of the spiral elastic element, and fix the set slider 4 with the fastening screw. According to the size scale set on the second correction arm, adjust the position of the upper limit slider of the second correction arm so that the size scale of its position is the sum of the radius of the spiral elastic element and 1 / 2 of the maximum misalignment, fix the set limit slider with the fastening screw, and adjust the distance between the two second pins on the limit slider so that it is equal to the width of the flat belt.

[0052] Fix the spiral elastic element with misalignment defect on the correction device, place the starting position of misalignment on the axis of the correction slider, put the flat belt part without misalignment between the two second pins of the upper limit slider of the first correction arm, and put the flat belt part with misalignment between the two second pins of the upper limit slider of the second correction arm. Rotate the correction screw to move the correction screw upward by the calculated displacement, which is determined by the pitch of the correction screw and the number of rotations. After the correction is completed, rotate the correction screw to drive the correction slider downward until the first pin no longer contacts the element, and remove the corrected element.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A spiral elastic element correction device, characterized in that: The invention comprises a circular chassis (6), wherein a correction slider groove (12) is arranged in the circular chassis (6) and extends radially along the outer circumference of the chassis, wherein a correction slider (2) is arranged in the correction slider groove (12), wherein the length of the correction slider (2) is less than the length of the correction slider groove (12), wherein a cavity is arranged in the middle of the correction slider (2) and serves as a space for a correction arm mounting seat (13), wherein a first correction arm (5) and a second correction arm (9) are hingedly connected to the correction arm mounting seat (13), wherein an axially penetrating A slide groove (14) passes through the correction arm, a limit slider (4) is arranged in the slide groove (14), two second pins (8) for fixing the element (3) are arranged on the limit slider (4), a correction screw (1) is arranged at the lower end of the correction slider groove (12), the correction screw (1) axially passes through the correction slider groove (12) and is connected to the lower end of the correction slider (2), a hemispherical rotating block (11) is arranged between the correction slider (2) and the correction screw (1), and a first pin (7) for the correction element (3) is arranged in the middle of the upper end of the correction slider (2).

2. The spiral elastic element correction device according to claim 1, characterized in that: A plurality of threaded holes (17) are symmetrically arranged on both sides of the slide groove (14) of the first correction arm (5); the limiting slider (4) is connected and fixed to the slide groove (14) by means of a fastening screw (16); a clearance notch (19) is arranged at the lower end of the slide groove (14); a through hole (15) is arranged at the lower end of the first correction arm (5); a plurality of threaded holes (17) are symmetrically arranged on both sides of the slide groove (14) of the second correction arm (9); the limiting slider (4) is connected and fixed to the slide groove (14) by means of a fastening screw (16); a through hole (15) is arranged at the lower end of the slide groove (14); a clearance notch (19) is arranged at the lower end of the second correction arm (9); the screw (10) passes through the through holes (15) arranged on the first correction arm (5) and the second correction arm (9), and the first correction arm (5) and the second correction arm (9) are hinged on the correction arm mounting seat (13).

3. The spiral elastic element correction device according to claim 1, characterized in that: The upper end surfaces of the first correction arm (5) and the second correction arm (9) are both provided with size scales, the upper ends of the slide grooves (14) of the first correction arm (5) and the second correction arm (9) are both provided with a number indicating notch (18), and the extended lines of the central axes of the first correction arm (5) and the second correction arm (9) intersect at the center of the chassis (6).

4. The spiral elastic element correction device according to claim 1, characterized in that: The upper surface of the chassis (6) is provided with an angle dimension scale.

5. A method for correcting a spiral elastic element based on the spiral elastic element correction device according to any one of claims 1 to 4, characterized in that: The following steps are involved: 1) Measure the maximum dislocation amount and position of the spiral elastic element with dislocation defects; 2) Calculate the correction amount based on the maximum misalignment and position measured; 3) Calculate the elastic recovery amount according to the outer diameter, flat belt width and thickness, yield strength and elastic modulus of the spiral elastic element with dislocation defects; 4) Fixing the spiral elastic element with the dislocation defect in the limit slider on the spiral elastic element correction device, and calculating the displacement of the correction screw according to the calculated correction amount and springback amount; 5) Rotate the correction screw on the spiral elastic element correction device so that the correction screw drives the correction slider to move upward by the calculated displacement; 6) Rotate the correction screw on the spiral elastic element correction device to drive the correction slider to move downward until the first pin on the correction slider no longer contacts the spiral elastic element, remove the spiral elastic element, and obtain a spiral elastic element without dislocation defects.

6. The method for correcting a spiral elastic element according to claim 5, characterized in that: The calculation formula of the correction amount in step 2) is as follows: Wherein, L is the correction amount of the spiral elastic element with misalignment defect, mm; W is the maximum misalignment of the spiral elastic element with misalignment defect, mm; α is the angle formed by the line connecting the axis of the second correction arm and the axis of the correction slider with the center of the chassis, °; θ is the position of the maximum misalignment, °.

7. The method for correcting a spiral elastic element according to claim 5, characterized in that: Step 3) The calculation formula for the hit rate is as follows: Where Δρ is the springback amount of the spiral elastic element correcting the dislocation defect, mm; ρ0 is the radius of curvature of the neutral layer of the spiral elastic element correcting the dislocation defect, Where Φ is the outer diameter of the spiral elastic element, mm; t is the width of the flat belt, mm; E is the elastic modulus, MPa; I is the moment of inertia of the flat belt section, Where b is the flat belt thickness, mm; M is the unloading bending moment, Where m is the relative bending moment, S is the static moment of the flat belt section, W is the cross-sectional modulus of the flat belt, F is the hardening index of the material; σ s is the yield strength of the flat belt, MPa.

8. The method for correcting a spiral elastic element according to claim 5, characterized in that: The calculation formula for the displacement of the correction screw in step 4) is as follows: S=L+Δρ Wherein, S is the displacement of the correction screw, mm; L is the correction amount of the spiral elastic element for correcting the misalignment defect, mm; Δρ is the recovery amount of the spiral elastic element for correcting the misalignment defect, mm.

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