A shockproof clamping device for precision machining of high alloy mold steel

Abstract

This utility model relates to the technical field of clamping devices for machining, specifically to a shock-resistant clamping device for precision machining of high-alloy mold steel. It includes a mounting plate installed on a machine tool. A mold steel placement seat for placing the mold steel is fixedly connected to the center of the upper surface of the mounting plate. Support plates are fixedly connected to both ends of one side of the upper end of the mounting plate. Rotating rods are rotatably connected to both support plates. A flipping plate is fixedly connected to one end of each of the rotating rods. The two flipping plates are located on opposite sides of the mold steel placement seat. A drive module is installed inside the mold steel placement seat to drive the flipping plates to flip. A clamping assembly is provided on the inner side of the upper end of each flipping plate. Compared to the prior art, this application solves the problem that the clamping force of the existing fixture is relatively constant and cannot be adjusted according to the vibration amplitude.

Description

Technical Field

[0001] This utility model relates to the technical field of clamping devices for machining, and in particular to a shockproof clamping device for precision machining of high alloy mold steel. Background Technology

[0002] High-alloy mold steel, as a core material in the field of precision manufacturing, is widely used in the manufacturing process of high-end equipment such as automotive molds, aerospace components, and precision injection molds. This type of steel usually contains a high proportion of alloying elements such as chromium, molybdenum, and vanadium, and has extremely high hardness, wear resistance, and thermal stability. However, its high hardness and brittleness also place extremely stringent requirements on the clamping process during the finishing stage. During finishing, the machine tool spindle speed often reaches 8,000-20,000 rpm. Although the cutting force is small, the vibration frequency is high (200-2000Hz). Any micron-level workpiece displacement can lead to tool tip chatter, surface scratches, or even tool chipping. Especially when machining deep cavities, thin walls, or complex curved surfaces, the workpiece needs to withstand the coupling effect of multi-directional cutting forces and vibrations. Traditional clamping methods cannot meet the dual requirements of "preventing overload damage" and "resisting vibration displacement," becoming a key bottleneck restricting the machining accuracy and surface quality of mold steel.

[0003] Existing clamping technologies mainly rely on mechanical constant-force clamping devices, such as manual spiral clamps, hydraulic chucks, or pneumatic vises. Their technical shortcomings are concentrated in three aspects: First, the clamping force adjustment mechanism is rigid. After the initial clamping force is set, it cannot respond in real time to dynamic load changes during machining. When the machine tool vibrates at high frequencies due to tool eccentricity, sudden changes in cutting parameters, or foundation resonance, the constant clamping force cannot offset the micro-displacement of the workpiece caused by the vibration, resulting in vibration marks (commonly known as "fish scales") or contour errors on the machined surface, seriously affecting the sealing performance and service life of the mold mating surfaces. Second, to prevent vibration displacement, operators often use excessive clamping force, usually exceeding 80% of the material's yield strength. However, high-alloy mold steel has high surface hardness but low toughness; excessive clamping force easily causes stress concentration in the contact area, resulting in micro-indentations or even surface cracks. These defects may expand into fatigue sources during subsequent heat treatment or use. Third, existing fixtures lack vibration monitoring and feedback capabilities, relying only on experience to preset the clamping force, failing to construct a closed-loop control system of "vibration sensing - force adjustment."

[0004] Furthermore, we disclose a shock-resistant clamping device for precision machining of high alloy mold steel to meet the practical needs of existing clamping devices where the clamping force is relatively constant and cannot be adjusted according to the vibration amplitude. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a shockproof clamping device for precision machining of high alloy mold steel, so as to solve the problem that the clamping force of the existing clamps is relatively constant and cannot be adjusted according to the vibration amplitude.

[0006] To achieve the above objectives, this utility model provides a vibration-damping clamping device for precision machining of high-alloy mold steel, comprising a mounting plate installed on a machine tool, a mold steel placement seat for placing mold steel fixedly connected to the middle of the upper end face of the mounting plate, support plates fixedly connected to both ends of one side of the upper end of the mounting plate, rotating rods rotatably connected to both support plates, and flipping plates fixedly connected to one end of each of the two rotating rods, with the two flipping plates located on both sides of the mold steel placement seat respectively. A drive module is provided inside the mold steel placement seat, the drive module being used to drive the flipping plates to flip. A clamping assembly is provided on the inner side of the upper end of the flipping plate, the clamping assembly being used to clamp the mold steel at the upper end of the mold steel placement seat, the clamping assembly being provided with a clamping force adjustment module, the clamping force adjustment module being used to adjust the force exerted by the clamping plates on the surface of the mold steel, and a vibration sensor being provided on the mold steel placement seat, the vibration sensor being used to detect the overall vibration amplitude of the machine tool.

[0007] Preferably, the mold steel placement seat has an internal cavity, and the drive module includes a partition plate fixedly connected to the middle of the cavity. A first hydraulic cylinder is provided on both sides of the partition plate. The output ends of the two first hydraulic cylinders are opposite. A push plate is fixedly connected to the output ends of the two first hydraulic cylinders. A push rod is fixedly connected to both ends of one side face of the push plate.

[0008] Preferably, both push rods are slidably connected to the mold steel placement seat, and both sides of the lower end of the flip plate are fixedly connected with abutment rods.

[0009] Preferably, the push rod and the abutment rod on the same side are coaxial and in contact with each other, and the ends of the push rod and the abutment rod that are close to each other are both spherical.

[0010] Preferably, a first torsion spring is installed at the connection between the rotating rod and the support plate.

[0011] Preferably, the clamping assembly includes connecting blocks rotatably connected to both sides of the upper end of the flip plate, with a rotating shaft fixedly connected to each of the two connecting blocks. The connecting blocks are rotatably connected to the flip plate through the rotating shaft, and a second torsion spring is sleeved at the connection points between the two ends of the rotating shaft and the flip plate.

[0012] Preferably, one end of each of the two connecting blocks is fixedly connected to a connecting plate, both ends of the connecting plate are slidably connected to guide rods, the two ends away from the guide rods are fixedly connected to clamping plates, and the middle of the outer wall of the two guide rods is slidably connected to a sliding plate between the clamping plates and the connecting plate.

[0013] Preferably, both ends of the slide plate near the clamp are fixedly connected to a telescopic spring, and the two telescopic springs are fixedly connected to the clamp on the side away from the slide plate.

[0014] Preferably, the clamping force adjustment module includes a second hydraulic cylinder installed in the middle of the connecting plate, the output end of the second hydraulic cylinder passing through the connecting plate and fixedly connected to the sliding plate.

[0015] Preferably, a pressure sensor is provided at the middle of the end face of the clamping plate near the mold steel, and a PLC controller is provided on the inner bottom surface of the cavity inside the mold steel placement seat. The PLC controller is electrically connected to the vibration sensor, the pressure sensor, the first hydraulic cylinder, and the second hydraulic cylinder.

[0016] The beneficial effects of this utility model are: This anti-vibration clamping device for precision machining of high alloy mold steel uses a closed-loop force control system consisting of a pressure sensor and a PLC controller to monitor and precisely adjust the clamping force acting on the surface of the mold steel in real time, ensuring that it is always maintained within the preset optimal range. This provides sufficient clamping force to resist machining vibration and ensure machining accuracy, while completely avoiding damage or deformation of the working surface caused by over-clamping. It overcomes the technical contradiction of traditional clamping devices being unable to balance "firm clamping" and "no damage".

[0017] This anti-vibration clamping device for precision machining of high alloy mold steel integrates a vibration sensor and links it with a PLC controller, enabling the clamping module to sense external environmental vibrations and make intelligent responses. It can dynamically fine-tune the clamping strategy based on real-time vibration data during machining, realizing a leap from passively bearing to actively suppressing vibrations. This greatly enhances the machining stability and reliability under complex and variable working conditions, and reduces the accuracy deviation and scrap rate caused by vibration. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal three-dimensional structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the flip-up plate of this utility model; Figure 4 This is a schematic diagram of the installation of the skateboard of this utility model; Figure 5 This is a schematic diagram of the installation of the second hydraulic cylinder of this utility model.

[0020] The diagram is marked as follows: 1. Mounting plate; 2. Support plate; 3. Rotating rod; 4. Flipping plate; 5. Clamping plate; 6. Vibration sensor; 7. Mold steel placement seat; 8. Partition plate; 9. PLC controller; 10. First hydraulic cylinder; 11. Push plate; 12. Push rod; 13. Abutting rod; 14. First torsion spring; 15. Pressure sensor; 16. Telescopic spring; 17. Slide plate; 18. Guide rod; 19. Connecting plate; 20. Second hydraulic cylinder; 21. Rotating shaft; 22. Connecting block; 23. Second torsion spring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figures 1 to 5As shown, a vibration-damping clamping device for precision machining of high alloy mold steel includes a mounting plate 1 installed on a machine tool. A mold steel placement seat 7 for placing mold steel is fixedly connected to the middle of the upper end face of the mounting plate 1. Support plates 2 are fixedly connected to both ends of one side of the upper end of the mounting plate 1. Rotating rods 3 are rotatably connected to both support plates 2. A flipping plate 4 is fixedly connected to one end of the two rotating rods 3. The two flipping plates 4 are located on both sides of the mold steel placement seat 7. A drive module is provided inside the mold steel placement seat 7. The drive module is used to drive the flipping plate 4 to flip. A clamping assembly is provided on the inner side of the upper end of the flipping plate 4. The clamping assembly is used to clamp the mold steel at the upper end of the mold steel placement seat 7. A clamping force adjustment module is provided on the clamping assembly. The clamping force adjustment module is used to adjust the force exerted by the clamping plate 5 on the surface of the mold steel. A vibration sensor 6 is provided on the mold steel placement seat 7. The vibration sensor 6 is used to detect the overall vibration amplitude of the machine tool. The device's workflow begins with placing the high-alloy mold steel to be processed onto the mold steel placement seat 7. Its specialized design provides initial positioning for the mold steel. Next, the drive module activates, rotating the tilting plate 4 around the rotating rod 3. The clamping components on the tilting plate 4 precisely tilt to the predetermined processing position. This automated tilting process replaces traditional manual adjustments, significantly improving work efficiency and ensuring consistent clamping positions, laying the foundation for subsequent stable high-precision machining. Subsequently, the clamping components begin to move. Throughout the finishing process, the core component is the clamping force adjustment module. The vibration sensor 6 continuously monitors the overall vibration amplitude of the machine tool in real time. If abnormal vibration or amplitude exceeding the safety threshold is detected, the system will take action. It can send signals to the control system, which in turn triggers the clamping force adjustment module to make necessary fine adjustments, such as appropriately increasing the clamping force to enhance the system's rigidity to resist vibration. This potential adaptive adjustment capability based on real-time sensing constitutes a positive anti-vibration feedback, which greatly improves the system's intelligence level and stability in dealing with emergencies and effectively reduces processing errors or scrap rates caused by vibration. After processing is completed, the drive module is restarted, and the reverse drive flip plate 4 flips and resets, so that the clamping components leave the processing area, making it convenient for the operator to safely and quickly remove the processed mold steel. Thus, a complete work cycle ends. The whole process highlights the design advantages of high automation, intelligence and active anti-vibration.

[0024] Furthermore, such as Figures 1 to 4As shown, the mold steel placement base 7 has an internal cavity. The drive module includes a partition 8 fixedly connected to the center of the cavity. A first hydraulic cylinder 10 is provided on both sides of the partition 8. The output ends of the two first hydraulic cylinders 10 are opposite. A push plate 11 is fixedly connected to the output ends of both first hydraulic cylinders 10. Push rods 12 are fixedly connected to both ends of one side of the push plate 11. Both push rods 12 are slidably connected to the mold steel placement base 7. Abutment rods 13 are fixedly connected to both sides of the lower end of the flip plate 4. The push rods 12 and abutment rods 13 on the same side are coaxial and in contact. The ends of the push rods 12 and abutment rods 13 that are close to each other are spherical. A first torsion spring 14 is installed at the connection between the rotating rod 3 and the support plate 2. The holding assembly includes connecting blocks 22 rotatably connected to both sides of the upper end of the flip plate 4. A rotating shaft 21 is fixedly connected to the two connecting blocks 22. The connecting blocks 22 are rotatably connected to the flip plate 4 through the rotating shaft 21. A second torsion spring 23 is sleeved at the connection points between the two ends of the rotating shaft 21 and the flip plate 4. A connecting plate 19 is fixedly connected to one end of the two connecting blocks 22. A guide rod 18 is slidably connected to both ends of the connecting plate 19. A clamping plate 5 is fixedly connected to the two ends away from the guide rod 18. A sliding plate 17 is slidably connected to the middle of the outer wall of the two guide rods 18 between the clamping plate 5 and the connecting plate 19. A telescopic spring 16 is fixedly connected to both ends of the side face of the sliding plate 17 near the clamping plate 5. The side of the two telescopic springs 16 away from the sliding plate 17 is fixedly connected to the clamping plate 5. When clamping the mold steel is required, the controller activates the drive module, and the two first hydraulic cylinders 10 move synchronously. Their synchronization is ensured by the PLC controller 9 using a master-slave control or parallel synchronization strategy. One cylinder is designated as the master shaft, and the other as the slave shaft. The slave shaft tracks the movement displacement or output force of the master shaft in real time, and uses high-precision displacement or pressure sensors for real-time feedback comparison. A PID algorithm dynamically adjusts the flow or pressure output of the slave shaft cylinder, ensuring extremely high synchronization accuracy during startup, operation, and shutdown. This effectively suppresses asynchrony caused by manufacturing errors, uneven load, or oil temperature fluctuations. The two first hydraulic cylinders 10 are synchronously controlled by the PLC, using consistent cycle time / stroke feedback. The timing or positional consistency constraint ensures the synchronicity of the two flipping plates. Its output end pushes the push plate 11 outwards, causing the push plate 11 to extend the push rods 12 at both ends out of the mold steel placement seat 7. The spherical ends of the push rods 12 then closely abut against the spherical ends of the abutment rods 13 fixed to the lower end of the flipping plate 4. Through this spherical contact, the powerful linear thrust is converted into a torque that drives the flipping plate 4 to rotate around the rotating shaft 21 on the rotating rod 3, overcoming the resistance of the first torsion spring 14 and pushing the two flipping plates 4 to synchronously and smoothly flip inwards to the working position. This hydraulic drive provides powerful, stable, and highly synchronized clamping force. As the flipping plate 4 flips, the clamping components on it move accordingly. When the clamping plate 5 contacts the surface of the mold steel workpiece... When the workpiece is in contact with the surface, the clamping action officially begins. The connecting plate 19 continues to move forward under the driving force, forcing the sliding plate 17, connected to the clamping plate 5 via a telescopic spring 16, to slide along the guide rod 18 towards the workpiece. At this time, the telescopic spring 16 is further compressed, and its elastic force acts directly on the clamping plate 5, converting into an actual clamping force on the workpiece. During this process, the clamping force is monitored in real-time by the pressure sensor 15 and fed back to the PLC controller 9. The PLC compares the real-time force value with a preset force control threshold. The setting of this threshold needs to comprehensively consider the material properties of the mold steel, the surface treatment state, and the precision machining requirements. For example, for high-hardness, easily damaged precision mold steel surfaces, a lower force threshold is set to prevent surface damage, while for surfaces requiring higher... For rough machining conditions requiring high clamping force to ensure stability, a high force threshold is set, and the output of the second hydraulic cylinder 20 is dynamically adjusted through a PID algorithm to achieve precise closed-loop control of the clamping force. This ensures that the clamping force is quickly and stably reached and maintained within the target threshold range, avoiding overshoot or oscillation. This process converts mechanical propulsion into spring pressure. When the pressure sensor 15 detects that the set pressure has been reached, the first hydraulic cylinder 10 stops working, achieving flexible clamping of the workpiece. This not only adapts to minor changes in the shape or size of the workpiece and ensures full contact, but also allows the first torsion spring 14 outside the rotating rod 3 to control the rotation angle of the entire clamping assembly, ensuring that the clamping plate 5 can contact the mold steel with the maximum contact area during clamping.

[0025] Furthermore, such as Figures 4 to 5As shown, the clamping force adjustment module includes a second hydraulic cylinder 20 installed in the middle of the connecting plate 19. The output end of the second hydraulic cylinder 20 passes through the connecting plate 19 and is fixedly connected to the slide plate 17. A pressure sensor 15 is provided in the middle of the side end face of the clamping plate 5 near the mold steel. A PLC controller 9 is provided on the inner bottom surface of the cavity inside the mold steel placement seat 7. The PLC controller 9 is electrically connected to the vibration sensor 6, the pressure sensor 15, the first hydraulic cylinder 10, and the second hydraulic cylinder 20. The module's workflow begins with the drive module rotating the flip plate 4 and clamping assembly to the working position. As the clamping plate 5 approaches the mold steel workpiece, the PLC controller 9 activates the clamping force adjustment module, instructing the second hydraulic cylinder 20 to actuate. Its output pushes the slide plate 17 forward along the guide rod 18, compressing the telescopic spring 16. This gradually increases the elastic force applied to the workpiece surface through the clamping plate 5. At this time, the pressure sensor 15 mounted on the clamping plate 5 monitors and feeds back the actual force value to the PLC controller 9 in real time. The PLC compares the real-time data with the preset optimal clamping force target value for the current workpiece material and process requirements. If the actual force value is lower than the target value, it instructs the second hydraulic cylinder 20 to increase its output; conversely, it decreases the output. Through this continuous closed-loop feedback adjustment, the clamping force is quickly and accurately stabilized at the preset optimal value. This achieves highly repeatable force control of the clamping force, reducing the possibility of workpiece loosening due to insufficient clamping force or surface damage or even deformation due to excessive clamping force. Throughout the finishing process, vibration sensor 6 continuously monitors environmental vibration. If abnormal or excessive amplitude signals are detected, PLC controller 9 will analyze the current clamping force data and immediately instruct the second hydraulic cylinder 20 to work, causing the slide plate 17 to slide on the guide rod 18 towards the clamping plate 5, increasing the clamping force of the telescopic spring 16. This forms an active anti-vibration closed-loop control system, greatly improving the stability and reliability of the system under complex working conditions. After machining, PLC controls all cylinders to release pressure in an orderly manner, and each component resets under the action of the torsion spring. The entire process demonstrates the significant advantages brought by highly intelligent, automated, and responsive precision force control, raising anti-vibration clamping technology to a new level.

[0026] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0027] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A shock absorbing clamping device for finish machining of a high alloy die steel, characterized by: The system includes a mounting plate (1) installed on a machine tool. A mold steel placement seat (7) for placing mold steel is fixedly connected to the middle of the upper surface of the mounting plate (1). Support plates (2) are fixedly connected to both ends of one side of the upper end of the mounting plate (1). Rotating rods (3) are rotatably connected to both support plates (2). A flip plate (4) is fixedly connected to one end of each of the two rotating rods (3). The two flip plates (4) are located on both sides of the mold steel placement seat (7). A drive module is provided inside the mold steel placement seat (7). The block is used to drive the flip plate (4) to flip. The flip plate (4) is provided with a clamping assembly on the inner side of its upper end. The clamping assembly includes a clamping plate (5). The clamping assembly is used to clamp the mold steel on the upper end of the mold steel placement seat (7). The clamping assembly is provided with a clamping force adjustment module. The clamping force adjustment module is used to adjust the force exerted by the clamping plate (5) on the surface of the mold steel. The mold steel placement seat (7) is provided with a vibration sensor (6). The vibration sensor (6) is used to detect the overall vibration amplitude of the machine tool.

2. The anti-vibration clamping device for finishing high-alloy die steel according to claim 1, characterized in that: The mold steel placement seat (7) has an internal cavity. The drive module includes a partition (8) fixedly connected in the middle of the cavity. A first hydraulic cylinder (10) is provided on both sides of the partition (8). The output ends of the two first hydraulic cylinders (10) are opposite. A push plate (11) is fixedly connected to the output ends of the two first hydraulic cylinders (10). A push rod (12) is fixedly connected to both ends of one side end face of the push plate (11).

3. The anti-vibration clamping device for finishing high-alloy die steel according to claim 2, characterized in that: Both push rods (12) are slidably connected to the mold steel placement seat (7), and both sides of the lower end of the flip plate (4) are fixedly connected with abutment rods (13).

4. The anti-vibration clamping device for finishing high-alloy die steel according to claim 3, characterized in that: The push rod (12) and the abutment rod (13) on the same side are coaxial and are in contact with each other. The ends of the push rod (12) and the abutment rod (13) that are close to each other are both spherical.

5. A shock absorbing clamping device for finishing high alloy die steel as claimed in claim 4, wherein: A first torsion spring (14) is installed at the connection between the rotating rod (3) and the support plate (2).

6. A shock absorbing clamping device for finishing high alloy die steel as claimed in claim 5, wherein: The clamping assembly includes connecting blocks (22) rotatably connected to both sides of the upper end of the flip plate (4). A rotating shaft (21) is fixedly connected to the two connecting blocks (22). The connecting blocks (22) are rotatably connected to the flip plate (4) through the rotating shaft (21). A second torsion spring (23) is sleeved at both ends of the rotating shaft (21) and the connection point of the flip plate (4).

7. The anti-vibration clamping device for precision machining of high alloy mold steel according to claim 6, characterized in that: One end of each of the two connecting blocks (22) is fixedly connected to a connecting plate (19), and both ends of the connecting plate (19) are slidably connected to guide rods (18). The two ends away from the guide rods (18) are fixedly connected to the clamping plate (5). The middle of the outer wall of the two guide rods (18) is slidably connected to a sliding plate (17) between the clamping plate (5) and the connecting plate (19).

8. The anti-vibration clamping device for precision machining of high alloy mold steel according to claim 7, characterized in that: The two ends of the slide plate (17) near the clamp plate (5) are fixedly connected to the extension springs (16), and the two extension springs (16) away from the slide plate (17) are fixedly connected to the clamp plate (5).

9. The anti-vibration clamping device for precision machining of high alloy mold steel according to claim 8, characterized in that: The clamping force adjustment module includes a second hydraulic cylinder (20) installed in the middle of the connecting plate (19). The output end of the second hydraulic cylinder (20) passes through the connecting plate (19) and is fixedly connected to the slide plate (17).

10. The anti-vibration clamping device for precision machining of high alloy mold steel according to claim 9, characterized in that: A pressure sensor (15) is provided in the middle of the end face of the clamping plate (5) near the mold steel. A PLC controller (9) is provided on the inner bottom surface of the cavity of the mold steel placement seat (7). The PLC controller (9) is electrically connected to the vibration sensor (6), the pressure sensor (15), the first hydraulic cylinder (10), and the second hydraulic cylinder (20).

Images