Constant torque spring machining apparatus and method

Abstract

The application provides a constant torque spring processing device and method, which comprises a spring forming assembly for bending a steel bar into a ring shape; a spring setting assembly, which comprises an inner setting tube with an outer diameter matched with a target inner diameter of a constant torque spring to be set; and an outer setting tube with an inner diameter matched with a target outer diameter of the constant torque spring to be set; the inner setting tube is installed on the inner side of the outer setting tube, and the constant torque spring to be set is installed between the inner setting tube and the outer setting tube. The application has the beneficial effects that the setting of the spring setting assembly can ensure the consistency of the size of the spring, improve the batch stability of the product, and further ensure the quality of the constant torque spring.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of constant torque spring processing, and particularly relates to a constant torque spring processing device and method. BACKGROUND

[0002] In the space environment, a passive deployment driving mechanism product is used on a spacecraft or a detection satellite, and a driving source is mostly a spring, therefore, the driving spring becomes a key part of the spacecraft mechanism, and the size precision and mechanical properties of the driving spring are one of the important factors influencing the success of the spacecraft mission.

[0003] Generally, a driving spring adopts a volute spring, however, the output torque of the volute spring decreases with the increase of the rotation angle, and the torque value is very small at the end of the movement, the constant torque cannot be output, and there is a risk that the given function cannot be completed, the constant torque spring can realize the output of a constant torque value in a certain range, based on the function of the constant torque spring, the constant torque spring is developed in the field of spaceflight, and the problems of low shape precision, low size precision, non-constant output torque and material creep of the planar ring spring are solved, and the current constant torque spring processing device and method have the following problems: first, there is no shaping process, so that the diameter consistency of the constant torque springs in the same batch is poor, and the quality of the constant torque spring is affected; second, when the driving torque normal distribution diagram of the constant torque springs in the same batch does not meet the requirements, the production parameters need to be blindly adjusted and then trial-produced, the production efficiency is reduced, and material waste is caused. SUMMARY

[0004] Therefore, the application aims to provide a constant torque spring processing device and method to at least solve the above problems.

[0005] To achieve the above object, the technical scheme of the application is as follows:

[0006] The application provides a constant torque spring processing device in the first aspect, which comprises:

[0007] A spring forming assembly is arranged for bending a steel bar into a ring shape.

[0008] A spring shaping assembly comprises:

[0009] An inner shaping tube has an outer diameter matched with a target inner diameter of a constant torque spring to be shaped.

[0010] An outer shaping tube has an inner diameter matched with a target outer diameter of the constant torque spring to be shaped.

[0011] The inner shaping tube is arranged on the inner side of the outer shaping tube, and the constant torque spring to be shaped is arranged between the inner shaping tube and the outer shaping tube.

[0012] Furthermore, the spring shaping assembly also includes a connecting plate, one end face of which is provided with an annular positioning boss, the inner diameter of which matches the outer diameter of the outer shaping tube;

[0013] The connecting plate is detachably connected to the outer shaping tube by bolts;

[0014] The outer side of the inner shaping tube is provided with an annular limiting boss. The outer diameter of the annular limiting boss matches the inner diameter of the outer shaping tube. There are multiple annular limiting bosses, which are evenly arranged along the length of the inner shaping tube. An annular positioning groove is formed between adjacent annular limiting bosses. The width of the annular positioning groove matches the width of the constant torque spring to be shaped.

[0015] Furthermore, an annular connecting boss is fixedly provided on the inner side of the end of the outer shaping tube away from the connecting plate, and the annular connecting boss is detachably connected to the inner shaping tube by bolts.

[0016] The distance between the annular connecting boss and the connecting plate is matched with the length of the inner shaping tube.

[0017] Furthermore, the outer shaping tube includes two arc-shaped plates;

[0018] One of the arc-shaped plates has a connecting boss 1 fixed on the outer sides of both ends, and the other arc-shaped plate has a connecting boss 2 fixed on the inner sides of both ends that matches the connecting boss 1.

[0019] Furthermore, the spring forming assembly includes:

[0020] The bracket includes a connecting block and vertical plates fixed to both sides of the connecting block;

[0021] The first clamping roller has two ends that are rotatably connected to two vertical plates respectively;

[0022] The second clamping roller has two ends that are rotatably connected to two vertical plates respectively, and the gap width between the first clamping roller and the second clamping roller is matched with the thickness of the steel strip to be processed.

[0023] A guide roller is located above the gap between the first clamping roller and the second clamping roller.

[0024] Furthermore, the second clamping roller is fixed with a second rotating shaft at both ends, and the first clamping roller is fixed with a first rotating shaft at both ends;

[0025] The vertical plate has a strip-shaped clamping through hole that matches the second rotating shaft. The width of the strip-shaped clamping through hole matches the diameter of the second rotating shaft. The second rotating shaft is located inside the strip-shaped clamping through hole. The vertical plate has a clamping threaded hole that communicates with the strip-shaped clamping through hole. The clamping threaded hole is set along the length of the strip-shaped clamping through hole and is located at the end away from the first clamping roller. A clamping bolt is threaded into the clamping threaded hole. The clamping bolt is used to limit the movement of the second rotating shaft.

[0026] The guide roller has a third rotating shaft fixed at both ends. The vertical plate has a strip-shaped adjustment hole corresponding to the third rotating shaft. The width of the strip-shaped adjustment hole matches the diameter of the third rotating shaft. The third rotating shaft is installed inside the strip-shaped adjustment hole. The vertical plate has an adjustment threaded hole communicating with the strip-shaped adjustment hole. The adjustment threaded hole is set along the length of the strip-shaped adjustment hole and is located at the end away from the second clamping roller. An adjustment bolt is threaded into the adjustment threaded hole. The adjustment bolt is used to limit the movement of the third rotating shaft.

[0027] Furthermore, a drive gear is fixedly provided on the first rotating shaft at one end of the first clamping shaft, and a handle is fixedly provided on the first rotating shaft at the other end;

[0028] One end of the second rotating shaft is provided with a driven gear, and the driving gear meshes with the driven gear.

[0029] A second aspect of the present invention provides a processing method using the constant torque spring processing device described in the first aspect, comprising the following steps:

[0030] S1. A steel bar with a processing length matching the unfolded length of the target constant torque spring, and a steel bar width matching the width of the target constant torque spring;

[0031] S2. Machining mounting holes on the steel strip and blunting the sharp edges of the parts;

[0032] S3. Insert a steel strip through the outside between the second clamping roller and the guide roller. The steel strip is placed perpendicular to the axis of the roller. The side of the steel strip is in contact with the side of the vertical plate. Rotate the clamping bolt to adjust the gap between the first clamping roller and the second clamping roller to clamp the steel strip. Rotate the adjusting bolt to adjust the distance between the guide roller and the second clamping roller. Rotate the first clamping roller to roll the steel strip into a round shape to form an intermediate product.

[0033] S4. The intermediate product is placed on the outside of the inner shaping tube, and the outer shaping tube is placed on the outside of the intermediate product. After heating to the preset temperature and holding for a preset time, it is cooled to room temperature and then polished to form a constant torque spring finished product.

[0034] S5. The constant torque spring is rotated at a preset angle according to a preset rotational angular velocity. The maximum frictional resistance torque is detected, and the driving stiffness value is obtained by fitting.

[0035] Furthermore, S5 includes the following steps:

[0036] S51. Each constant torque spring product is tested multiple times and the average value is taken as the test result.

[0037] S52. Test multiple finished constant torque springs and obtain the normal distribution diagram of the driving torque of the constant torque springs;

[0038] S53. Determine whether the normal distribution diagram of the driving torque of the constant torque spring meets the design requirements;

[0039] If the conditions are met, then production will proceed;

[0040] If the requirements are not met, adjust the steel bar width, steel bar thickness, and the preset temperature and time of heating in S4 until the normal distribution diagram of the constant torque spring driving torque meets the design requirements.

[0041] Furthermore, the preset temperature range in S4 is 480℃~550℃;

[0042] The preset time is 2 to 3 hours.

[0043] Compared with the prior art, the constant torque spring processing device and method of the present invention have the following advantages:

[0044] (1) The constant torque spring processing device of the present invention can ensure the consistency of spring size through the shaping function of the spring shaping component, improve the batch stability of the product, and thus ensure the quality of the constant torque spring.

[0045] (2) The constant torque spring processing device of the present invention predicts the normal distribution diagram of stiffness value through a neural network model, and can adjust a certain parameter in a targeted manner to adjust the performance of the constant torque spring, thereby improving work efficiency and avoiding material waste. Attached Figure Description

[0046] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0047] Figure 1 This is a three-dimensional structural diagram of the spring forming assembly according to an embodiment of the present invention;

[0048] Figure 2 This is a schematic cross-sectional view of the spring forming assembly according to an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the three-dimensional structure of the spring according to an embodiment of the present invention;

[0050] Figure 4 As described in the embodiments of the present invention Figure 2 Schematic diagram of the structure at point A in the middle;

[0051] Figure 5 This is a schematic diagram of the first cross-sectional structure of the spring shaping assembly according to an embodiment of the present invention;

[0052] Figure 6 This is a second cross-sectional view of the spring shaping assembly according to an embodiment of the present invention;

[0053] Figure 7 As described in the embodiments of the present invention Figure 5 Schematic diagram at point B in the middle.

[0054] Explanation of reference numerals in the attached figures:

[0055] 1. Vertical plate; 2. Connecting block; 3. First clamping roller; 4. Second clamping roller; 5. Guide roller; 6. Adjusting bolt; 7. Clamping bolt; 8. Constant torque spring; 9. Outer shaping roller; 10. Inner shaping roller; 11. Connecting plate; 101. Strip clamping through hole; 102. Strip adjusting hole; 301. Handle; 801. Mounting hole; 901. Annular connecting boss; 1001. Annular limiting boss; 1101. Annular positioning boss. Detailed Implementation

[0056] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0060] like Figures 1 to 7 As shown, a constant torque spring processing device includes:

[0061] Spring forming assembly, used to bend steel bars into rings;

[0062] Spring shaping assembly, the spring shaping assembly includes:

[0063] The inner shaping tube 10 has an outer diameter that matches the target inner diameter of the constant torque spring 8 to be shaped.

[0064] The outer shaping tube 9 has an inner diameter that matches the target outer diameter of the constant torque spring 8 to be shaped.

[0065] The inner shaping tube 10 is installed inside the outer shaping tube 9, and the constant torque spring 8 to be shaped is installed between the inner shaping tube 10 and the outer shaping tube 9.

[0066] The spring shaping assembly also includes a connecting plate 11. One end face of the connecting plate 11 is provided with an annular positioning boss 1101. The inner diameter of the annular positioning boss 1101 matches the outer diameter of the outer shaping tube 9. The connecting plate 11 is detachably connected to the outer shaping tube 9 by bolts. The design of the connecting plate 11 and the annular positioning boss 1101 plays a role in positioning and fixing the outer shaping tube 9, which improves work efficiency and ensures the stability of the production process.

[0067] An annular limiting boss 1001 is provided on the outer side of the inner shaping tube 10. The outer diameter of the annular limiting boss 1001 matches the inner diameter of the outer shaping tube 9. There are multiple annular limiting bosses 1001, which are evenly arranged along the length of the inner shaping tube 10. An annular positioning groove is formed between adjacent annular limiting bosses 1001. The width of the annular positioning groove matches the width of the constant torque spring 8 to be shaped. The annular positioning groove plays a positioning role for the spring, improving its stability during use.

[0068] An annular connecting boss 901 is fixedly provided on the inner side of the end of the outer shaping tube 9 away from the connecting plate 11. The annular connecting boss 901 is detachably connected to the inner shaping tube 10 by bolts. The distance between the annular connecting boss 901 and the connecting plate 11 matches the length of the inner shaping tube 10. Fixing the inner shaping tube 10 improves the stability of the assembly.

[0069] The outer shaping tube 9 includes two arc-shaped plates; one arc-shaped plate has a connecting boss 1 fixed on the outer sides of both ends, and the other arc-shaped plate has a connecting boss 2 fixed on the inner sides of both ends, which matches the connecting boss 1. The arrangement of the two arc-shaped plates facilitates the disassembly of the spring.

[0070] The spring forming assembly includes: a bracket, which includes a connecting block 2 and vertical plates 1 fixed on both sides of the connecting block 2; a first clamping roller 3, the two ends of which are rotatably connected to the two vertical plates 1 respectively; a second clamping roller 4, the two ends of which are rotatably connected to the two vertical plates 1 respectively, and the gap width between the first clamping roller 3 and the second clamping roller 4 matches the thickness of the steel strip to be processed; and a guide roller 5, which is located above the gap between the first clamping roller 3 and the second clamping roller 4.

[0071] The second clamping roller 4 has a second rotating shaft fixed at both ends, and the first clamping roller 3 has a first rotating shaft fixed at both ends. The vertical plate 1 has a strip-shaped clamping through hole 101 that matches the second rotating shaft. The width of the strip-shaped clamping through hole 101 matches the diameter of the second rotating shaft. The second rotating shaft is located inside the strip-shaped clamping through hole 101. The vertical plate 1 has a clamping threaded hole that communicates with the strip-shaped clamping through hole 101. The clamping threaded hole is set along the length of the strip-shaped clamping through hole 101 and is located at the end away from the first clamping roller 3. The clamping threaded hole is internally threaded with a clamping bolt 7. The clamping bolt 7 is used to limit the second rotating shaft. By adjusting the position of the clamping bolt 7, it can be used for steel bars of different thicknesses, which improves the applicability of the device and makes it easier for steel bars to be inserted into the gap between the first clamping roller 3 and the second clamping roller 4.

[0072] The guide roller 5 has a third rotating shaft fixed at both ends. A strip-shaped adjustment hole 102 corresponding to the third rotating shaft is opened on the vertical plate 1. The width of the strip-shaped adjustment hole 102 matches the diameter of the third rotating shaft. The third rotating shaft is installed inside the strip-shaped adjustment hole 102. An adjustment threaded hole communicating with the strip-shaped adjustment hole 102 is opened on the vertical plate 1. The adjustment threaded hole is set along the length of the strip-shaped adjustment hole 102 and is located at the end away from the second clamping roller 4. An adjustment bolt 6 is threaded into the adjustment threaded hole and is used to limit the movement of the third rotating shaft. By adjusting the position of the adjustment bolt 6, it can be used to manufacture springs of different diameters, thus broadening the applicability of the device.

[0073] The first rotating shaft at one end of the first clamping shaft is fixed with a drive gear, and the first rotating shaft at the other end is fixed with a handle 301; one end of the second rotating shaft is provided with a driven gear, and the drive gear meshes with the driven gear, realizing the synchronous rotation of the first clamping roller 3 and the first clamping roller 3, preventing scratches on the steel strip and improving product quality.

[0074] A method for manufacturing a constant torque spring includes the following steps:

[0075] S1. Process a steel strip with a length matching the unfolded length of the target constant torque spring 8, and a width matching the width of the target constant torque spring 8. Process the raw steel strip into a rectangular shape with a smooth surface, free from pits, inclusions, and other defects. Roll the steel strip into a steel strip with a thickness of t ± 0.01 mm using a rolling mill. Inspect the thickness and surface quality of the steel strip. Cut the steel strip into a rectangular shape, with the length dimension meeting the unfolded length l ± 0.01 mm of the annular constant torque spring 8, and the width dimension meeting the width w ± 0.01 mm of the annular constant torque spring 8. The cutting method can be wire cutting or stamping in one step using a stamping machine.

[0076] The steel bar is made of 3Cr19Ni9Mo2N stainless steel, with an elastic modulus of 160-210 GPa, tensile strength greater than 1800 MPa, and elongation after fracture greater than 1%. The raw material is in strip shape, and the thickness and width dimensions meet the requirements of the rolling mill. It has a high carbon and nitrogen content, and through strengthening, it can have advantages such as high strength, high hardness, high elasticity, and fatigue resistance. It can be used to manufacture high-precision, high-performance elastic elements.

[0077] S2. Machining mounting holes 801 on the steel strips and blunting the sharp edges of the parts; stacking 8-10 steel strips aligned, clamping them with stainless steel protective plates, and pressing them firmly onto the worktable of the CNC machining center with pressure plates, and machining mounting holes 801 to the required dimensions using an alloy drill bit at high speed. Cooling with cutting fluid is used during the machining process. The machined steel strip parts are then blunted at the edges using 1000-grit sandpaper, and the hole edges are blunted using a grinding head. After blunting, they are cleaned with anhydrous ethanol and dried in an oven.

[0078] S3. Insert a steel strip through the outer side between the second clamping roller 4 and the guide roller. The steel strip is placed perpendicular to the axis of the roller, and the side of the steel strip is in contact with the side of the vertical plate 1. Rotate the clamping bolt 7 to adjust the gap between the first clamping roller 3 and the second clamping roller 4 to clamp the steel strip. The gap δ between the first clamping roller 3 and the second clamping roller 4 is equal to the thickness of the steel strip. Rotate the adjusting bolt 6 to adjust the distance between the guide roller 5 and the second clamping roller 4. Rotate the first clamping roller 3 to roll the steel strip into a round shape to form an intermediate product. Each time the steel strip passes through the roller, it is rolled once. Repeat the rolling multiple times until the inner diameter of the ring d meets the drawing requirement of φd±0.02, and the gap at the opening is not greater than 2mm.

[0079] S4. Clean the annular constant torque spring 8 and the stabilization treatment fixture with aviation kerosene, and let them air dry naturally. Wear gloves during the installation process to prevent contamination of the parts. Place the intermediate product on the outside of the inner shaping tube 10, and the outer shaping tube 9 on the outside of the intermediate product (in the annular mounting groove). Place the spring shaping assembly containing the constant torque spring 8 in the screen basket of the vacuum furnace according to the quantity and position required by the process document. Place the screen basket in the vacuum furnace, heat to the preset temperature and hold for the preset time, then cool to room temperature and polish to form the finished constant torque spring 8.

[0080] Based on the dimensions of the inner shaping tube 10, multiple constant torque springs 8 can be installed at once. The mandrel is clamped with two arc plates, and the screws are tightened to fix the annular constant torque spring 8.

[0081] Remove the constant torque spring 8 from the spring shaping assembly and inspect its shape and surface. If there is a color change, mount the constant torque spring 8 on the mandrel and polish it, being careful not to deform the annular constant torque spring 8 during the polishing process. Polish the areas with color change with 1000-grit wet sandpaper until the metal color is restored.

[0082] The preset temperature range in S4 is 480℃~550℃;

[0083] The preset time is 2 to 3 hours.

[0084] S5. The constant torque spring 8 finished product rotates at a preset angle according to a preset rotational angular velocity, and the driving torque and maximum frictional resistance torque are detected. The driving stiffness value is obtained by fitting.

[0085] Performance tests included: driving torque, frictional resistance torque, and driving stiffness. A 10x magnifying glass was used to inspect the surface of the annular constant torque spring 8, finding no cracks, scratches, or other defects.

[0086] S5 includes the following steps:

[0087] S51. Each constant torque spring (8 finished products) is tested multiple times, and the average value is taken as the test result.

[0088] S52. Test multiple finished constant torque springs 8 and obtain the normal distribution diagram of the driving torque of the constant torque springs 8;

[0089] S53. Determine whether the normal distribution diagram of the driving torque of constant torque spring 8 meets the design requirements;

[0090] If the conditions are met, then production will proceed;

[0091] If the requirements are not met, adjust the steel bar width, steel bar thickness, and the preset temperature and time of heating in S4 until the normal distribution diagram of the driving torque of the constant torque spring 8 meets the design requirements.

[0092] The process of adjusting the steel bar width, steel bar thickness, and the preset heating temperature and time in S4 is as follows:

[0093] Collect historical data, including steel bar material, steel bar width, steel bar thickness, preset temperature and preset time, and a normal distribution diagram of driving torque;

[0094] Training deep neural networks using historical data:

[0095] Extract features from the normal distribution plot of stiffness values;

[0096] The characteristics of a normal distribution plot of stiffness values ​​include:

[0097] Mean: The value at the center of a normal distribution, representing the average level of stiffness values.

[0098] Standard deviation: measures the dispersion of stiffness data. The larger the standard deviation, the more dispersed the data distribution.

[0099] Skewness: describes the symmetry of a normal distribution. A positive value indicates that the tail on the right is longer, and a negative value indicates that the tail on the left is longer.

[0100] Kurtosis describes the sharpness of the peaks in a normal distribution. A positive value indicates a sharper peak, while a negative value indicates a flatter peak.

[0101] Probability Density Function (PDF): Although not a direct statistic, PDF can be used as a feature for direct model training.

[0102] The cumulative distribution function (CDF) describes the probability that a random variable is less than or equal to a certain value, and can also be used as a feature.

[0103] The steel bar material, steel bar width, steel bar thickness, preset temperature, and preset time are used as independent variables, while the characteristics of the normal distribution of stiffness values ​​are used as dependent variables.

[0104] Evaluate model performance using independent validation datasets, and adjust model structure or training parameters based on validation results to improve prediction accuracy.

[0105] The actual steel bar material, steel bar width, steel bar thickness, preset temperature, and preset time are input into the trained neural network model, which outputs a predicted normal distribution map of the driving torque.

[0106] If the predicted driving torque normal distribution does not meet the requirements, adjust the steel bar material, steel bar width, steel bar thickness, preset temperature, and preset time, and re-input them into the trained neural network model until the predicted driving torque normal distribution meets the design requirements, and then conduct actual production verification.

[0107] Set constraints, such as minimum stiffness requirements for springs, heat treatment ranges for materials, and limitations on processing techniques.

[0108] The strategies for adjusting the steel bar material, width, thickness, preset temperature, and preset time are as follows:

[0109] Steel bar material: Different materials may have different physical properties and heat treatment responses, and these differences may affect the shape and position of the normal distribution of stiffness values.

[0110] Steel bar width: Width can affect the stiffness value because a wider steel bar may have a larger cross-sectional area, resulting in higher stiffness.

[0111] Steel bar thickness: The relationship between thickness and stiffness is similar to that between width; thicker steel bars may have higher stiffness.

[0112] Preset temperature: The temperature during heat treatment affects the crystal structure and size of the steel bar, thus affecting its stiffness. Different preset temperatures may result in different stiffness value distributions.

[0113] Preset time: The duration of heat treatment also affects the properties of steel bars; the length of time may lead to changes in stiffness values.

[0114] Beneficial effects:

[0115] The shaping function of the spring shaping component ensures the consistency of spring dimensions, improves batch stability, and thus guarantees the quality of constant force springs.

[0116] By predicting the normal distribution of stiffness values ​​using a neural network model, the performance of constant force springs can be directionally adjusted by specifically modifying a certain parameter, thereby improving work efficiency and avoiding material waste.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A constant torque spring processing device, characterized in that, include: A spring forming assembly for bending a steel bar into a ring shape; Spring shaping assembly, the spring shaping assembly comprising: An inner shaping tube (10) is provided, the outer diameter of which matches the target inner diameter of the constant torque spring (8) to be shaped. An outer shaping tube (9) has an inner diameter that matches the target outer diameter of the constant torque spring (8) to be shaped. The inner shaping tube (10) is installed inside the outer shaping tube (9), and the constant torque spring (8) to be shaped is installed between the inner shaping tube (10) and the outer shaping tube (9); The spring shaping assembly also includes a connecting plate (11), one end face of which is provided with an annular positioning boss (1101), the inner diameter of which matches the outer diameter of the outer shaping tube (9); The connecting plate (11) is detachably connected to the outer shaping tube (9) by bolts; The inner shaping tube (10) has an annular limiting boss (1001) on its outer side wall. The outer diameter of the annular limiting boss (1001) matches the inner diameter of the outer shaping tube (9). There are multiple annular limiting bosses (1001). The multiple annular limiting bosses (1001) are evenly arranged along the length direction of the inner shaping tube (10). An annular positioning groove is formed between adjacent annular limiting bosses (1001). The width of the annular positioning groove matches the width of the constant torque spring (8) to be shaped. The spring forming assembly includes: The bracket includes a connecting block (2) and vertical plates (1) fixed on both sides of the connecting block (2); The first clamping roller (3) has two ends that are rotatably connected to the two vertical plates (1); The second clamping roller (4) has two ends that are rotatably connected to two vertical plates (1), and the gap width between the first clamping roller (3) and the second clamping roller (4) matches the thickness of the steel strip to be processed. The guide roller (5) is located above the gap between the first clamping roller (3) and the second clamping roller (4).

2. The constant torque spring processing device according to claim 1, characterized in that: An annular connecting boss (901) is fixedly provided on the inner side of the end of the outer shaping tube (9) away from the connecting plate (11). The annular connecting boss (901) is detachably connected to the inner shaping tube (10) by bolts. The distance between the annular connecting boss (901) and the connecting plate (11) matches the length of the inner shaping tube (10).

3. The constant torque spring processing device according to claim 2, characterized in that: The outer shaping tube (9) includes two arc-shaped plates; One of the arc-shaped plates has a connecting boss 1 fixed on the outer sides of both ends, and the other arc-shaped plate has a connecting boss 2 fixed on the inner sides of both ends that matches the connecting boss 1.

4. The constant torque spring processing device according to claim 1, characterized in that: The second clamping roller (4) has a second rotating shaft fixed at both ends, and the first clamping roller (3) has a first rotating shaft fixed at both ends; The vertical plate (1) has a strip-shaped clamping through hole (101) that matches the second rotating shaft. The width of the strip-shaped clamping through hole (101) matches the diameter of the second rotating shaft. The second rotating shaft is located inside the strip-shaped clamping through hole (101). The vertical plate (1) has a clamping threaded hole that communicates with the strip-shaped clamping through hole (101). The clamping threaded hole is set along the length direction of the strip-shaped clamping through hole (101) and is located at one end away from the first clamping roller (3). The clamping threaded hole is internally threaded with a clamping bolt (7) and the clamping bolt (7) is used to limit the second rotating shaft. The guide roller (5) has a third rotating shaft fixed at both ends. The vertical plate (1) has a strip-shaped adjustment hole (102) corresponding to the third rotating shaft. The width of the strip-shaped adjustment hole (102) matches the diameter of the third rotating shaft. The third rotating shaft is installed inside the strip-shaped adjustment hole (102). The vertical plate (1) has an adjustment threaded hole communicating with the strip-shaped adjustment hole (102). The adjustment threaded hole is set along the length direction of the strip-shaped adjustment hole (102). The adjustment threaded hole is located at the end away from the second clamping roller (4). The adjustment threaded hole is internally threaded with an adjustment bolt (6). The adjustment bolt (6) is used to limit the third rotating shaft.

5. The constant torque spring processing device according to claim 4, characterized in that: The first rotating shaft at one end of the first clamping roller (3) is fixedly provided with a drive gear, and the first rotating shaft at the other end is fixedly provided with a handle (301); One end of the second rotating shaft is provided with a driven gear, and the driving gear meshes with the driven gear.

6. A processing method using the constant torque spring processing apparatus according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Process a steel bar with a length matching the unfolded length of the target constant torque spring (8) and a width matching the width of the target constant torque spring (8); S2. Machining mounting holes (801) on the steel strip and blunting the sharp edges of the parts; S3. Insert a steel strip through the outside between the second clamping roller (4) and the guide roller. The steel strip is placed perpendicular to the direction of the roller axis. The side of the steel strip is in contact with the side of the vertical plate (1). Rotate the clamping bolt (7) to adjust the gap between the first clamping roller (3) and the second clamping roller (4) to clamp the steel strip. Rotate the adjusting bolt (6) to adjust the distance between the guide roller (5) and the second clamping roller (4). Rotate the first clamping roller (3) to roll the steel strip into a round shape to form an intermediate product. S4. The intermediate product is placed on the outside of the inner shaping tube (10), and the outer shaping tube (9) is placed on the outside of the intermediate product. After heating to the preset temperature and holding for a preset time, it is cooled to room temperature and then polished to form the finished constant torque spring (8). S5. The constant torque spring (8) rotates at a preset angle according to a preset rotational angular velocity, and the maximum frictional resistance torque is detected and the driving stiffness value is obtained by fitting.

7. The processing method according to claim 6, characterized in that: S5 includes the following steps: S51. Each constant torque spring (8) finished product is tested multiple times and the average value is taken as the test result; S52. Test multiple constant torque spring (8) finished products and obtain the normal distribution diagram of the driving torque of constant torque spring (8); S53. Determine whether the normal distribution diagram of the driving torque of the constant torque spring (8) meets the design requirements; If the conditions are met, then production will proceed; If the requirements are not met, the steel bar width, steel bar thickness, and the preset temperature and preset time of heating in S4 are adjusted until the normal distribution diagram of the driving torque of the constant torque spring (8) meets the design requirements.

8. The processing method according to claim 6, characterized in that: The preset temperature range in S4 is 480℃~550℃; The preset time is 2 to 3 hours.

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