Clamp for large-wire-diameter spring cold rolling machining

Abstract

The invention relates to the technical field of spring machining, in particular to a large-wire-diameter spring cold rolling machining clamp which comprises a base provided with a rotary supporting structure and a clamping assembly comprising at least two sets of adjustable clamping pieces. An arc-shaped groove is formed in the inner side of the clamping piece, the curvature radius of the arc-shaped groove is matched with the outer diameter of a spring wire to be machined, the clamping force is evenly dispersed in combination with the anti-skid texture design, the local indentation or crack risk is reduced, and the fatigue life of a spring finished product is prolonged. The clamping piece comprises a clamp body, the clamp body is composed of at least two clamping units which can be connected in a sliding mode, and an elastic buffer layer is arranged at the sliding connection position of the clamping units and used for absorbing stress generated by material deformation in the clamping process, so that the clamp replacement frequency is reduced, and the production cost is reduced; the clamping force is dynamically adjusted by combining the hydraulic driving mechanism with the torque sensor, so that material surface damage caused by too tight clamping or sliding caused by too loose clamping is avoided, and the stability of the large-wire-diameter spring in the cold rolling process is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of spring processing, in particular to a clamp for cold-rolling processing of large-diameter springs. Background Art

[0002] Cold coiling of large-diameter springs (wire diameter typically ≥Φ10mm) is a common metal forming process, typically used to manufacture high-strength, high-precision spring products. Traditionally, cold coiling requires the material to be tempered before processing. The wire is fixed in a fixture and rotary-wound to form the coil, followed by stress relief treatment (such as tempering) to eliminate residual stress from processing. However, with increasing industrial demand for spring performance (such as load capacity and fatigue life), cold coiling of large-diameter springs often presents issues such as insufficient clamping stability, poor wire diameter adaptability, stress concentration, and surface damage. These issues limit the efficiency of cold coiling large-diameter springs and the quality of the finished product. Summary of the Invention

[0003] The present application discloses a clamp for cold-rolling large-diameter springs, aiming to solve the technical problems of insufficient clamping stability, poor wire diameter adaptability, stress concentration and easy surface damage in the existing clamps in the related art during the processing of large-diameter springs.

[0004] In order to solve the above problems, the present invention adopts the following technical solutions: The present invention provides a clamp for cold-rolling large-diameter springs, comprising a base on which a rotating support structure is provided; a clamping assembly comprising at least two groups of adjustable clamping members, the clamping members being evenly distributed on the rotating support structure of the base along the circumference, and the clamping force being adjusted by a hydraulic drive mechanism; an arc-shaped groove is provided on the inner side of the clamping member, the curvature radius of the arc-shaped groove is adapted to the outer diameter of the spring wire to be processed, and the clamping member comprises a clamp body, which is composed of at least two slidably connected clamping units; wherein an elastic buffer layer is provided at the sliding connection of the clamping unit for absorbing stress generated by material deformation during the clamping process; a torque sensor is provided on the rotating support structure of the base for real-time monitoring of the clamping torque and feeding it back to the hydraulic drive mechanism to dynamically adjust the clamping force.

[0005] Preferably, the clamping unit of the clamp body is fixed by a threaded connection, and the clamping unit is provided with a gap compensation device for adjusting the clamping distance according to the change of the wire diameter.

[0006] Preferably, the gap compensation device includes an elastic push rod and an adjusting nut, one end of the elastic push rod abuts against the bottom surface of the clamping unit, and the adjusting nut is used to manually or automatically adjust the push rod preload to compensate for the clamping gap.

[0007] Preferably, the surface of the arc-shaped groove is provided with an anti-slip texture, and the anti-slip texture is a V-groove or a lattice structure.

[0008] Preferably, the rotating support structure includes a central shaft and a bearing group, the central shaft is rotatably connected to the base through the bearing group, and a positioning reference block is provided at one end of the central shaft for calibrating the initial installation position of the spring wire.

[0009] Preferably, the clamp further comprises a cooling system, the cooling system comprises a nozzle, the nozzle is aimed at the clamping assembly, and the spraying angle of the nozzle is adjustable to cover the contact surface between the clamping member and the wire.

[0010] Preferably, the hydraulic drive mechanism comprises a proportional hydraulic valve, which is electrically connected to the torque sensor to automatically adjust the hydraulic pressure according to the clamping torque monitored in real time.

[0011] Preferably, the contact area between the clamping member of the clamping assembly and the wire in the clamping state is 1.2-1.5 times the cross-sectional area of ​​the wire.

[0012] Preferably, the clamp further includes a control system, and the output signal of the torque sensor is connected to the control system, and the control system triggers an alarm device or an automatic shutdown device according to the difference between a preset clamping torque upper limit value and a real-time monitoring value.

[0013] Preferably, the elastic buffer layer is made of polyurethane material and has a thickness of 2-5 mm.

[0014] The technical solution adopted by the present invention can achieve the following beneficial effects: 1. The present invention provides a clamp for cold-rolling springs with large wire diameters, comprising a base and a clamping assembly, which dynamically adjusts the clamping force through a hydraulic drive mechanism combined with a torque sensor to avoid surface damage to the material caused by excessive clamping or slippage caused by excessive loosening, thereby significantly improving the stability of the cold-rolling process of springs with large wire diameters; the clamping assembly comprises a clamping piece, which comprises a clamp body, which is composed of a plurality of slidably connected clamping units, and cooperates with an elastic buffer layer to absorb deformation stress, and can flexibly adapt to a wire diameter range of Φ10mm-Φ50mm, thereby reducing the frequency of clamp replacement and reducing production costs; an arc-shaped groove is provided on the inner side of the clamping piece, which is adapted to the outer diameter of the wire, and combined with an anti-slip texture design, it evenly disperses the clamping force, reduces the risk of local indentations or cracks, and improves the fatigue life of the finished spring.

[0015] 2. Through threaded connectors and gap compensation devices, the spacing between the clamping units can be precisely adjusted according to changes in wire diameter, ensuring a close fit between the clamping parts and the wire, reducing the risk of misalignment. At the same time, the preload force can be adjusted manually or automatically to meet the needs of different production lines. It is particularly suitable for batch production of springs of multiple specifications, shortening changeover time and improving equipment utilization.

[0016] 3. The structural design of setting an elastic push rod combined with an adjusting nut in the gap compensation device can not only absorb the slight deformation between the clamping units, but also adapt to the difference in wire diameter through pre-tightening force adjustment, ensuring that the clamping parts are always in stable contact with the wire during the clamping process. At the same time, the elastic characteristics of the elastic push rod can buffer the fluctuation of the clamping force, avoid the wear of the clamping unit caused by rigid connection, and extend the service life of the clamp.

[0017] 4. The anti-slip texture design of V-groove or lattice structure significantly improves the friction coefficient of the contact surface between the clamp and the wire, preventing the wire from slipping during the cold coiling process and ensuring winding accuracy.

[0018] 5. The rotating support structure includes a central shaft and a bearing group. A positioning reference block is set on the central shaft. The positioning reference block calibrates the initial installation position of the spring wire to ensure that the wire axis is consistent with the rotation center of the clamping assembly during the winding process, reducing the spring geometric deviation caused by eccentric winding. There is no need for manual repeated adjustment of the wire position, which improves clamping efficiency and reduces the probability of human error.

[0019] 6. The fixture also includes a cooling system. The nozzle of the cooling system is aimed at the clamping component and the spray angle is adjustable to ensure that the coolant accurately covers the contact area between the wire and the clamping component, effectively reducing the friction heat generated during the cold coiling process and preventing local softening or performance degradation of the material.

[0020] 7. The proportional hydraulic valve automatically adjusts the hydraulic pressure according to the torque sensor feedback signal, so that the clamping force is always in the optimal range, avoiding insufficient or overload problems caused by fluctuations in wire hardness or differences in winding stages.

[0021] 8. The contact area is expanded to 1.2-1.5 times the cross-sectional area of ​​the wire, significantly reducing the unit pressure of the clamp on the wire, avoiding indentations or surface cracks, and significantly improving the surface quality of the finished spring.

[0022] 9. Introduce a working parameter monitoring process during the working process of the clamp. The control system triggers an alarm or shuts down the machine in time by comparing the preset torque upper limit with the real-time monitoring value, avoiding material breakage or clamp damage caused by clamping force overload, thereby reducing the risk of production accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1is a schematic diagram of a fixture for cold-coiling a large-diameter spring disclosed in some embodiments of the present application; Figure 2 is a top view of a fixture for cold-coiling a large-diameter spring disclosed in some embodiments of the present application; Figure 3 This is a schematic diagram of a clamping unit of a fixture for cold-rolling large-diameter springs disclosed in some embodiments of the present application.

[0025] In the picture: 1. Used for cold coiling processing fixture of large diameter spring; 10. Base; 11. Clamping assembly; 12. Cooling system; 100, rotating support structure; 101, torque sensor; 110, clamping member; 111, hydraulic drive mechanism; 112, arc-shaped groove; 113, fixture body; 120, nozzle; 1000, center shaft; 1001, bearing assembly; 1002, positioning reference block; 1130, clamping unit; 1131, elastic buffer layer; 1132, threaded connector; 1133, gap compensation device; 1134, elastic push rod; 1135, adjusting nut. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0027] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0028] Cold coiling of large-diameter springs is a common metal forming process, typically used to manufacture high-strength, high-precision spring products. Traditionally, cold coiling is performed after the material has been quenched and tempered. The wire is secured in a fixture and then coiled to form a shape. Stress relief treatment (such as tempering) is then performed to eliminate residual stresses from the process. However, as industrial demand for higher spring performance (such as load capacity and fatigue life) increases, cold coiling of large-diameter springs (typically ≥Φ10mm) faces higher requirements, such as: Material deformation control: During the cold rolling process, it is necessary to balance the clamping force and the plastic deformation of the material to avoid surface damage caused by too tight clamping or slippage caused by too loose clamping; Wire diameter adaptability: Existing fixtures are mostly designed for fixed wire diameters, making it difficult to flexibly adapt to large-diameter wire materials of different specifications; Stress concentration problem: Cold coiling can easily cause stress concentration in the clamping area, affecting the mechanical properties of the finished spring.

[0029] The following is combined with Figures 1 to 3 , a clamp 1 for cold rolling processing of large-diameter springs provided in this application is described in detail through specific embodiments and application scenarios.

[0030] Please refer to Figure 1-Figure 2 Some embodiments of the present invention provide a fixture 1 for cold-rolling large-diameter springs, including a base 10 on which a rotating support structure 100 is provided; a clamping assembly 11, including at least two groups of adjustable clamping members 110, the clamping members 110 are evenly distributed on the rotating support structure 100 of the base 10 along the circumferential direction, and the clamping force is adjusted by a hydraulic drive mechanism 111; an arc-shaped groove 112 is provided on the inner side of the clamping member 110, and the curvature radius of the arc-shaped groove 112 is adapted to the outer diameter of the spring wire to be processed, and the clamping member 110 includes a clamp body 113, which is composed of at least two slidably connected clamping units 1130; wherein, an elastic buffer layer 1131 is provided at the sliding connection of the clamping unit 1130, which is used to absorb the stress generated by material deformation during the clamping process; a torque sensor 101 is provided on the rotating support structure 100 of the base 10, which is used to monitor the clamping torque in real time and feed it back to the hydraulic drive mechanism 111 to dynamically adjust the clamping force.

[0031] Furthermore, the surface of the arc-shaped groove 112 is provided with an anti-slip texture, and the anti-slip texture is a V-groove or a lattice structure.

[0032] It can be understood that the clamping force is dynamically adjusted through the hydraulic drive mechanism 111 in combination with the torque sensor 101 to avoid damage to the material surface caused by excessive clamping or slippage caused by excessive looseness, thereby significantly improving the stability of the cold winding process of large-diameter springs; the clamping assembly 11 includes a clamping member 110, and the clamping member 110 includes a clamp body 113. The clamp body 113 is composed of a plurality of slidably connected clamping units 1130, and cooperates with the elastic buffer layer 1131 to absorb deformation stress, which can flexibly adapt to the wire diameter range of Φ10mm-Φ50mm, reduce the frequency of clamp replacement, and reduce production costs; an arc-shaped groove 112 is provided on the inner side of the clamping member 110, and the arc-shaped groove 112 is adapted to the outer diameter of the wire. Combined with the anti-slip texture design, the friction coefficient of the contact surface between the clamping member 110 and the wire is significantly improved, preventing the wire from slipping during the cold winding process, ensuring winding accuracy, evenly dispersing the clamping force, reducing the risk of local indentations or cracks, and improving the fatigue life of the finished spring.

[0033] Further, please combine Figure 3 The clamping unit 1130 of the clamp body 113 is fixed by a threaded connector 1132, and the clamping unit 1130 is provided with a gap compensation device 1133 for adjusting the clamping distance according to the change of the wire diameter.

[0034] It can be understood that through the threaded connector 1132 and the gap compensation device 1133, the spacing of the clamping unit 1130 can be accurately adjusted according to the change of wire diameter, ensuring that the clamping part 110 fits tightly with the wire and reducing the risk of offset. At the same time, the preload force design can be adjusted manually or automatically to adapt to the needs of different production lines. It is especially suitable for batch production scenarios of springs of multiple specifications, shortening changeover time and improving equipment utilization.

[0035] Furthermore, the gap compensation device 1133 includes an elastic push rod 1134 and an adjusting nut 1135. One end of the elastic push rod 1134 abuts against the bottom surface of the clamping unit 1130. The adjusting nut 1135 is used to manually or automatically adjust the push rod preload to compensate for the clamping gap.

[0036] It can be understood that the structural design of the elastic push rod 1134 combined with the adjusting nut 1135 in the gap compensation device 1133 can not only absorb the slight deformation between the clamping units 1130, but also adapt to the wire diameter difference through pre-tightening adjustment, ensuring that the clamping member 110 is always in stable contact with the wire during the clamping process. At the same time, the elastic characteristics of the elastic push rod 1134 can buffer the fluctuation of the clamping force, avoid wear of the clamping unit 1130 caused by rigid connection, and extend the service life of the clamp.

[0037] Furthermore, the rotating support structure 100 includes a central shaft 1000 and a bearing group 1001. The central shaft 1000 is rotatably connected to the base 10 through the bearing group 1001, and a positioning reference block 1002 is provided at one end of the central shaft 1000 for calibrating the initial installation position of the spring wire.

[0038] It can be understood that the positioning reference block 1002 calibrates the initial installation position of the spring wire to ensure that the wire axis is consistent with the rotation center of the clamping assembly 11 during the winding process, thereby reducing the spring geometric deviation caused by eccentric winding, eliminating the need for manual repeated adjustment of the wire position, improving clamping efficiency, and reducing the probability of human error.

[0039] Furthermore, an embodiment of the present invention provides a fixture 1 for cold rolling of large-diameter springs, which also includes a cooling system 12. The cooling system 12 includes a nozzle 120. The nozzle 120 is aligned with the clamping assembly 11. The spray angle of the nozzle 120 is adjustable to cover the contact surface between the clamping member 110 and the wire.

[0040] It can be understood that the nozzle 120 of the cooling system 12 is aligned with the clamping assembly 11 and the spray angle is adjustable to ensure that the coolant accurately covers the contact area between the wire and the clamping member 110, effectively reducing the friction heat generated during the cold rolling process and preventing local softening or performance degradation of the material.

[0041] Optionally, the coolant in the cooling system 12 can be a water-soluble cutting fluid, a semi-synthetic cutting fluid or a plant-based environmentally friendly cutting fluid, which is not limited here; specifically, the coolant used in this embodiment is a water-soluble cutting fluid to which extreme pressure additives (sulfurized fatty acid esters), rust inhibitors (sodium nitrite) and lubricants (fatty acid soaps) are added.

[0042] Furthermore, the hydraulic drive mechanism 111 includes a proportional hydraulic valve, which is electrically connected to the torque sensor 101 to automatically adjust the hydraulic pressure according to the clamping torque monitored in real time.

[0043] It can be understood that the proportional hydraulic valve automatically adjusts the hydraulic pressure according to the feedback signal of the torque sensor 101 so that the clamping force is always in the optimal range, avoiding insufficient or overload problems of clamping force caused by fluctuations in wire hardness or differences in winding stages.

[0044] Furthermore, the contact area between the clamping member 110 of the clamping assembly 11 and the wire in the clamping state is 1.2-1.5 times the cross-sectional area of ​​the wire, preferably 1.3 times.

[0045] It can be understood that expanding the contact area to 1.2-1.5 times the cross-sectional area of ​​the wire can significantly reduce the unit pressure of the clamping member 110 on the wire, avoid indentations or surface cracks, and significantly improve the surface quality of the finished spring.

[0046] Furthermore, an embodiment of the present invention provides a fixture 1 for cold-rolling large-diameter springs, which also includes a control system (not shown in the figure). The output signal of the torque sensor 101 is connected to the control system, and the control system triggers an alarm device or an automatic shutdown device based on the difference between a preset upper limit value of the clamping torque and a real-time monitoring value.

[0047] It is understandable that a working parameter monitoring process is introduced during the working process of the fixture. The control system triggers an alarm or shutdown in time by comparing the preset torque upper limit value with the real-time monitoring value, thereby avoiding material breakage or fixture damage caused by clamping force overload and reducing the risk of production accidents.

[0048] Specifically, the upper limit of the clamping torque preset in the control system needs to take the following factors into consideration: Material yield strength: The yield strength of the spring wire determines the upper limit of the clamping force to avoid plastic deformation or breakage of the material due to over-tightening; Rated clamping force of the fixture: A safety margin must be left for the maximum design clamping force of the fixture (usually 80%-90%); Process parameters: deformation law of wire and change of friction coefficient during cold coiling.

[0049] Furthermore, the elastic buffer layer 1131 is made of polyurethane material and has a thickness of 2-5 mm; the thickness of the elastic buffer layer 1131 is preferably 4 mm.

[0050] Specifically, the polyurethane material has excellent elasticity and energy absorption capacity. The thickness of 2-5mm can effectively buffer the impact force caused by the plastic deformation of the material during the clamping process, reduce direct damage to the clamping part 110 and the wire, and is not easy to wear during frequent clamping operations. Combined with the sliding connection design of the clamping unit 1130, it extends the overall service life of the clamp and reduces maintenance costs.

[0051] Compared with the prior art, the clamp for cold-rolling large-diameter springs provided by the present invention has the following beneficial effects: 1. The present invention provides a clamp for cold-rolling springs with large wire diameters, comprising a base and a clamping assembly, which dynamically adjusts the clamping force through a hydraulic drive mechanism combined with a torque sensor to avoid surface damage to the material caused by excessive clamping or slippage caused by excessive loosening, thereby significantly improving the stability of the cold-rolling process of springs with large wire diameters; the clamping assembly comprises a clamping piece, which comprises a clamp body, which is composed of a plurality of slidably connected clamping units, and cooperates with an elastic buffer layer to absorb deformation stress, and can flexibly adapt to a wire diameter range of Φ10mm-Φ50mm, thereby reducing the frequency of clamp replacement and reducing production costs; an arc-shaped groove is provided on the inner side of the clamping piece, which is adapted to the outer diameter of the wire, and combined with an anti-slip texture design, it evenly disperses the clamping force, reduces the risk of local indentations or cracks, and improves the fatigue life of the finished spring.

[0052] 2. Through threaded connectors and gap compensation devices, the spacing between the clamping units can be precisely adjusted according to changes in wire diameter, ensuring a close fit between the clamping parts and the wire, reducing the risk of misalignment. At the same time, the preload force can be adjusted manually or automatically to meet the needs of different production lines. It is particularly suitable for batch production of springs of multiple specifications, shortening changeover time and improving equipment utilization.

[0053] 3. The structural design of setting an elastic push rod combined with an adjusting nut in the gap compensation device can not only absorb the slight deformation between the clamping units, but also adapt to the difference in wire diameter through pre-tightening force adjustment, ensuring that the clamping parts are always in stable contact with the wire during the clamping process. At the same time, the elastic characteristics of the elastic push rod can buffer the fluctuation of the clamping force, avoid the wear of the clamping unit caused by rigid connection, and extend the service life of the clamp.

[0054] 4. The anti-slip texture design of V-groove or lattice structure significantly improves the friction coefficient of the contact surface between the clamp and the wire, preventing the wire from slipping during the cold coiling process and ensuring winding accuracy.

[0055] 5. The rotating support structure includes a central shaft and a bearing group. A positioning reference block is set on the central shaft. The positioning reference block calibrates the initial installation position of the spring wire to ensure that the wire axis is consistent with the rotation center of the clamping assembly during the winding process, reducing the spring geometric deviation caused by eccentric winding. There is no need for manual repeated adjustment of the wire position, which improves clamping efficiency and reduces the probability of human error.

[0056] 6. The fixture also includes a cooling system. The nozzle of the cooling system is aimed at the clamping component and the spray angle is adjustable to ensure that the coolant accurately covers the contact area between the wire and the clamping component, effectively reducing the friction heat generated during the cold coiling process and preventing local softening or performance degradation of the material.

[0057] 7. The proportional hydraulic valve automatically adjusts the hydraulic pressure according to the torque sensor feedback signal, so that the clamping force is always in the optimal range, avoiding insufficient or overload problems caused by fluctuations in wire hardness or differences in winding stages.

[0058] 8. The contact area is expanded to 1.2-1.5 times the cross-sectional area of ​​the wire, significantly reducing the unit pressure of the clamp on the wire, avoiding indentations or surface cracks, and significantly improving the surface quality of the finished spring.

[0059] 9. Introduce a working parameter monitoring process during the working process of the clamp. The control system triggers an alarm or shuts down the machine in time by comparing the preset torque upper limit with the real-time monitoring value, avoiding material breakage or clamp damage caused by clamping force overload, thereby reducing the risk of production accidents.

[0060] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0061] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0062] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A fixture for cold-rolling large-diameter springs, characterized in that: include: a base, on which a rotating support structure is disposed; A clamping assembly comprising at least two sets of adjustable clamping members, the clamping members being evenly distributed along the circumference on the rotating support structure of the base, and the clamping force is adjusted by a hydraulic drive mechanism; The inner side of the clamping member is provided with an arc-shaped groove, the curvature radius of which is adapted to the outer diameter of the spring wire to be processed, and the clamping member includes a clamp body, which is composed of at least two slidably connected clamping units; Wherein, an elastic buffer layer is provided at the sliding connection of the clamping unit to absorb the stress generated by material deformation during the clamping process; A torque sensor is provided on the rotating support structure of the base for real-time monitoring of the clamping torque and feeding back the torque to the hydraulic drive mechanism to dynamically adjust the clamping force.

2. A fixture for cold-rolling large-diameter springs according to claim 1, characterized in that: The clamping unit of the clamp body is fixed by a threaded connector, and the clamping unit is provided with a gap compensation device for adjusting the clamping distance according to the change of wire diameter.

3. The fixture for cold-rolling large-diameter springs according to claim 2, characterized in that: The gap compensation device includes an elastic push rod and an adjusting nut. One end of the elastic push rod abuts against the bottom surface of the clamping unit. The adjusting nut is used to manually or automatically adjust the push rod preload to compensate for the clamping gap.

4. The fixture for cold-rolling large-diameter springs according to claim 1, characterized in that: The surface of the arc-shaped groove is provided with an anti-slip texture, and the anti-slip texture is a V-shaped groove or a lattice structure.

5. The fixture for cold-rolling large-diameter springs according to claim 1, characterized in that: The rotating support structure includes a central shaft and a bearing group. The central shaft is rotatably connected to the base through the bearing group, and a positioning reference block is provided at one end of the central shaft for calibrating the initial installation position of the spring wire.

6. The fixture for cold-rolling large-diameter springs according to claim 1, characterized in that: The clamp further comprises a cooling system, wherein the cooling system comprises a nozzle, wherein the nozzle is aimed at the clamping assembly, and the spraying angle of the nozzle is adjustable to cover the contact surface between the clamping member and the wire.

7. The fixture for cold-rolling large-diameter springs according to claim 1, characterized in that: The hydraulic drive mechanism includes a proportional hydraulic valve, which is electrically connected to the torque sensor to automatically adjust the hydraulic pressure according to the clamping torque monitored in real time.

8. The fixture for cold-rolling large-diameter springs according to claim 1, characterized in that: The contact area between the clamping member of the clamping assembly and the wire in the clamping state is 1.2-1.5 times the cross-sectional area of ​​the wire.

9. The fixture for cold-rolling large-diameter springs according to claim 1, characterized in that: The clamp also includes a control system, and the output signal of the torque sensor is connected to the control system. The control system triggers an alarm device or an automatic shutdown device according to the difference between a preset clamping torque upper limit value and a real-time monitoring value.

10. The fixture for cold-rolling large-diameter springs according to claim 1, characterized in that: The elastic buffer layer is made of polyurethane material and has a thickness of 2-5 mm.

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