A processing die for an eccentric crankshaft

Abstract

The present invention relates to the field of processing molds, and discloses a processing mold for an eccentric crankshaft, including: a driving turntable; a chuck eccentrically installed on the driving turntable, the chuck being used for clamping an eccentric crankshaft material; an adjustment groove opened on one side of the driving turntable, an adjustment seat is connected in the adjustment groove, the adjustment seat is connected to the chuck, and the adjustment seat is arranged to move in the adjustment groove for adjusting the eccentricity of the chuck. In the present invention, through real-time monitoring and linkage with double adjustment blocks, the centrifugal force generated due to rotational speed fluctuations is accurately compensated, and the automatic regulation of the rotation radius of the second adjustment block can quickly adapt to the weight differences of different batches of materials without manual intervention during shutdown, improving processing efficiency and versatility. During turning, the position of the second adjustment block is adjusted online according to real-time data to effectively cope with the centrifugal force change caused by the decreasing weight of the material and ensure stable processing accuracy.

Description

Technical Field

[0001] The present invention relates to the field of processing dies, and particularly to a processing die for an eccentric crankshaft. Background Art

[0002] The eccentric crankshaft is a core component of power machinery such as internal combustion engines and compressors, and its processing accuracy directly affects the operation stability of the equipment. During the processing of the eccentric crankshaft, due to the deviation of the workpiece centroid from the rotation axis, a periodic centrifugal force will be generated during rotation, resulting in machine tool vibration, increased tool wear, and decreased processing accuracy. Traditional processing dies usually use fixtures with a fixed eccentricity for static positioning, and cannot compensate for dynamic imbalance in real time. Especially under high-speed rotation conditions, the processing quality is seriously affected.

[0003] In the prior art, the centrifugal force compensation for eccentric machining mainly adopts the following methods:

[0004] Mechanical spacer compensation method (such as publication number CN201920587634.5): The centroid is adjusted by installing eccentric spacers on the chuck, but the spacers need to be replaced manually and cannot dynamically adapt to changes in rotational speed and material weight.

[0005] Active balancing device (such as publication number CN202110345678.9): The counterweight is driven by a servo motor to adjust in real time, but the system is complex, costly, and requires additional energy supply, and is not suitable for harsh working conditions.

[0006] Hydraulic damping compensation (such as publication number CN202021234567.8): The centrifugal force is offset by hydraulic pressure, but the response speed is slow and cannot meet the requirements of high-speed machining.

[0007] Existing dies rely on static pre-balancing and cannot respond to rotational speed fluctuations in real time, resulting in out-of-tolerance vibration amplitudes. There are differences in the weights of materials in different batches, and the processing die cannot automatically adjust the compensation force. It is necessary to stop the machine for manual intervention. During the turning process, the material weight decreases, the centrifugal force changes dynamically, and the processing die cannot be adjusted online. Summary of the Invention

[0008] To solve the problems mentioned above, the present invention is realized through the following technical solutions.

[0009] A processing mold for an eccentric crankshaft, comprising: a driving turntable; a chuck eccentrically mounted on the driving turntable, the chuck being used for clamping an eccentric crankshaft material; an adjusting groove opened on one side of the driving turntable, an adjusting seat connected in the adjusting groove, the adjusting seat being connected to the chuck, and the adjusting seat being arranged to move in the adjusting groove for adjusting the eccentricity of the chuck; an adjusting hole opened on one side of the driving turntable, the adjusting hole being parallel and extending in the opposite direction to the adjusting groove; a first adjusting block connected in the adjusting hole, the first adjusting block being arranged to move in the adjusting hole, and the first adjusting block being used for compensating in real time for the periodic centrifugal force generated by the deviation of the centroid of the chuck from the rotation axis; a second adjusting block connected in the adjusting hole, the second adjusting block being arranged to move in the adjusting hole, and the moving directions of the first adjusting block and the second adjusting block being opposite to the moving direction of the adjusting seat, the second adjusting block being used for compensating in real time for the periodic centrifugal force generated by the deviation of the centroid of the eccentric crankshaft material from the rotation axis, and by adjusting the position of the second adjusting block, the rotation radius of the second adjusting block is changed to adapt to the different centrifugal forces generated by materials of different weights.

[0010] Preferably, the chuck includes: a moving groove opened on the surface of the chuck, the number of the moving grooves being two, and the two moving grooves being symmetrically distributed with the center of the chuck as the symmetry axis; two movable blocks respectively connected in the two moving grooves; two displacement sensors respectively installed on the inner walls of the two moving grooves, and the displacement sensors being used for detecting the displacement difference between the two movable blocks.

[0011] Preferably, the chuck further includes: an elastic member, with both ends of the elastic member respectively connected to the movable block and the inner wall of the moving groove.

[0012] Preferably, the first adjusting block includes: a control groove opened on the first adjusting block; a first limiting head installed in the control groove, a limiting plate being installed on the inner wall of the adjusting hole, and the first limiting head being used for fixing the position of the first adjusting block in the adjusting hole when it fits with the limiting plate; a first power source, the output shaft of the first power source being connected to the first limiting head, and the first power source being used for providing a driving force for the first limiting head.

[0013] Preferably, a limiting tooth is connected to one side of the first limiting head, and a tooth groove meshing with the limiting tooth is opened on the side of the limiting plate close to the first limiting head.

[0014] Preferably, the second adjusting block includes: a through hole opened on the second adjusting block; two second limiting heads, the two second limiting heads being installed in the through hole and being symmetrically arranged, and the second limiting heads being used for fixing the position of the second adjusting block in the adjusting hole when they fit with the inner wall of the adjusting hole.

[0015] Preferably, the second adjusting block further includes: a control wheel disposed within the through hole. Two symmetrically arranged protrusions are provided on the control wheel. The protrusions are used to push the second limiting head out of the through hole and into contact with the inner wall of the adjusting hole. A second power source is connected to the second adjusting block, and the power shaft of the second power source is connected to the control wheel.

[0016] Preferably, a first sliding table is connected to the inner wall of the adjusting hole, and the first adjusting block is connected to the first sliding table; a second sliding table is installed on the first adjusting block, and the first adjusting block is connected to the second adjusting block through the second sliding table.

[0017] Preferably, the processing die further includes: a frame, on which the driving turntable is installed; a vibration monitor installed on the frame, and the detection axis of the vibration monitor coincides with the rotation axis of the driving turntable.

[0018] Preferably, the driving turntable includes: a first screw rod installed in the adjusting groove, the first screw rod is threadedly connected to the adjusting seat, and the adjusting seat is driven to move by the first screw rod with threaded fit; a control head installed at one end of the first screw rod, the control head is disposed on the driving turntable, and an internal hexagonal driving interface is provided at one end of the control head.

[0019] Preferably, the chuck includes: a transition adjusting sleeve installed inside the chuck; an eccentric chuck core installed inside the transition adjusting sleeve; four fine-tuning jackscrews, the four fine-tuning jackscrews penetrate through the chuck and are in contact with the eccentric chuck core, the four fine-tuning jackscrews are arranged in a circumferential array, and fine-tuning nuts are connected to the fine-tuning jackscrews; a chuck core positioning key installed inside the transition adjusting sleeve, the chuck core positioning key is arranged to move inside the transition adjusting sleeve for adjusting the depth of the workpiece inserted into the eccentric chuck core; an adjusting jackscrew installed at one end of the eccentric chuck core, and the adjusting jackscrew is connected to the chuck core positioning key

[0020] The present invention provides a processing die for an eccentric crankshaft. Compared with the prior art, it has the following beneficial effects: In this solution, the vibration acceleration signal of the driving turntable is collected in real time by the vibration monitor and transmitted to the control system. By using the displacement difference between the movable blocks in the two symmetrically distributed moving grooves on the chuck, combined with the stiffness coefficient of the elastic member, the mass of the movable block, and the distance difference from the rotation axis of the driving turntable, the angular velocity of the driving turntable is calculated, and then the centrifugal force generated due to the deviation of the eccentric crankshaft material and the center of mass of the chuck from the rotation axis is obtained.

[0021] When the control system determines that the centrifugal force needs to be compensated, it can quickly control the actions of the first adjusting block and the second adjusting block. The first adjusting block releases the locked state through the first power source and moves to a suitable position driven by the first sliding table to compensate for the periodic centrifugal force generated by the deviation of the center of mass of the chuck from the rotation axis. The second adjusting block drives the control wheel through the second power source, and after unlocking, it changes the rotation radius under the action of the second sliding table to compensate for the centrifugal force generated by the deviation of the center of mass of the eccentric crankshaft material from the rotation axis.

[0022] This real-time dynamic compensation mechanism can effectively cope with the rotational speed fluctuations, greatly reduce the vibration amplitude from the relatively high level of traditional molds, improve the stability of the processing process, avoid the problem of excessive vibration amplitude deviation, and meet the requirements of vibration control for high-precision machining.

[0023] Regarding the differences in the weights of materials in different batches, the second adjusting block of this solution plays a key role. Since the second adjusting block can move within the adjusting hole, the magnitude of the generated centrifugal force is adjusted by changing its rotation radius. Brief Description of the Drawings

[0024] Figure 1 It is a schematic three-dimensional structure diagram proposed by the present invention.

[0025] Figure 2 It is a schematic diagram of the chuck structure proposed by the present invention.

[0026] Figure 3 It is a schematic diagram of the frame and the driving turntable structure proposed by the present invention.

[0027] Figure 4 It is a schematic diagram of the frame and the vibration monitor structure proposed by the present invention.

[0028] Figure 5 It is a schematic cross-sectional view of the driving turntable proposed by the present invention.

[0029] Figure 6 It is a schematic diagram of the driving turntable, the first adjusting block and the second adjusting block structure proposed by the present invention.

[0030] Figure 7 It is a schematic diagram of the first adjusting block, the limiting plate, the first limiting head and the first power source structure proposed by the present invention.

[0031] Figure 8 It is a schematic diagram of the second adjusting block, the second limiting head, the control wheel and the second power source structure proposed by the present invention;

[0032] Figure 9 It is a schematic three-dimensional structure diagram of the chuck in the second embodiment.

[0033] Figure 10 It is a schematic cross-sectional view of the chuck in the second embodiment.

[0034] The reference numerals in the figure are as follows:

[0035] 100, frame; 101, vibration monitor;

[0036] 200, drive turntable; 201, adjustment groove; 202, adjustment seat; 203, first screw; 204, control head; 205, adjustment hole; 206, first sliding table; 207, limiting plate;

[0037] 300, chuck; 301, moving groove; 302, movable block; 303, elastic member; 304, displacement sensor; 305, transition adjustment sleeve; 306, eccentric chuck core; 307, fine adjustment set screw; 308, fine adjustment nut; 309, chuck core positioning key; 310, adjustment set screw;

[0038] 400, first adjustment block; 401, second sliding table; 402, control groove; 403, first limiting head; 404, first power source;

[0039] 500, second adjustment block; 501, through hole; 502, second limiting head; 503, control wheel; 504, second power source. Detailed implementation manners

[0040] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the protection scope of the present invention.

[0041] The following illustrates the implementation manners of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0042] Embodiment 1

[0043] Refer to Figures 1 - 8, A processing die for an eccentric crankshaft, comprising: a driving turntable 200; a chuck 300, eccentrically mounted on the driving turntable 200, and the chuck 300 is used for clamping the eccentric crankshaft material; an adjusting groove 201, opened on one side of the driving turntable 200, an adjusting seat 202 is connected in the adjusting groove 201, the adjusting seat 202 is connected to the chuck 300, and the adjusting seat 202 is arranged to move in the adjusting groove 201 for adjusting the eccentricity of the chuck 300; an adjusting hole 205, opened on one side of the driving turntable 200, the adjusting hole 205 is arranged in parallel and extends in the reverse direction with the adjusting groove 201; a first adjusting block 400, connected in the adjusting hole 205, the first adjusting block 400 is arranged to move in the adjusting hole 205, and the first adjusting block 400 is used for compensating in real time the periodic centrifugal force generated by the centroid of the chuck 300 deviating from the rotation axis; a second adjusting block 500, connected in the adjusting hole 205, the second adjusting block 500 is arranged to move in the adjusting hole 205, and the moving directions of the first adjusting block 400 and the second adjusting block 500 are opposite to the moving direction of the adjusting seat 202, and the second adjusting block 500 is used for compensating in real time the periodic centrifugal force generated by the centroid of the eccentric crankshaft material deviating from the rotation axis. By adjusting the position of the second adjusting block 500, the rotation radius of the second adjusting block 500 is changed to adapt to the different centrifugal forces generated by different weights of materials.

[0044] In this embodiment, the driving turntable 200 serves as the power rotating component of the entire die, providing rotational power for the processing of the eccentric crankshaft to ensure the smooth progress of the processing. The chuck 300 can move on the driving turntable 200, so that the eccentricity of the chuck 300 can be adjusted, and different eccentricities can be set on the same processing die to meet different processing requirements; the vibration monitor 101 monitors the vibration condition of the driving turntable 200 in real time and transmits the monitored vibration data to the control system. The control system judges the unbalanced state of the current processing die according to the vibration data, and analyzes the magnitude and direction of the centrifugal force that needs to be compensated in combination with the centrifugal force data calculated by the displacement difference of the movable block 302.

[0045] Centrifugal force calculation formula

[0046]

[0047] In the formula:

[0048] - Centrifugal force (unit: N) - Mass (unit: kg) ω - Angular velocity (unit: rad / s) - Eccentricity (unit: m)

[0049] When the control system determines that it is necessary to adjust the position of the first adjustment block 400 to compensate for the centrifugal force generated by the deviation of the centroid of the chuck 300 from the rotation axis, different processing requirements may cause the chuck 300 to have different degrees of eccentricity. When the eccentricity is large, the required compensating centrifugal force will also increase accordingly. By adjusting the position of the first adjustment block 400, the dynamic imbalance of the chuck 300 can be compensated in real time. Moreover, the centrifugal force is proportional to the square of the rotational speed. At different processing speeds, the centrifugal force generated by the chuck 300 varies greatly. When the rotational speed is high, the centrifugal force generated by the chuck 300 will increase significantly. At this time, by adjusting the position of the first adjustment block 400, the dynamic imbalance of the chuck 300 can also be compensated in real time. Control the first power source 404 to work so that the first limit head 403 is separated from the limit plate 207, and the locking state of the first adjustment block 400 is released. Then drive the first adjustment block 400 to move through the first sliding table 206. During the movement, the vibration data of the driving turntable 200 is monitored in real time until the first adjustment block 400 moves to a suitable position in the adjustment hole 205. Then control the first power source 404 to make the first limit head 403 fit with the limit plate 207 again, and fix the position of the first adjustment block 400 through the engagement of the tooth groove and the limit tooth. After the first adjustment block 400 moves to a new position, the direction of the centrifugal force generated by it is opposite to the direction of the centrifugal force generated by the deviation of the centroid of the chuck 300 from the rotation axis, and the magnitudes are equal, thereby realizing the real-time compensation of the dynamic imbalance of the chuck 300.

[0050] Displacement difference and centrifugal force conversion formula

[0051]

[0052] In the formula:

[0053] - Spring stiffness coefficient (unit: N / m) - Displacement difference between two moving blocks (unit: m) - Damping coefficient (unit: N·s / m) - Displacement difference change rate (unit: m / s)

[0054] During the turning process of the eccentric crankshaft, the weight of the eccentric crankshaft changes, and the resulting centrifugal force also changes accordingly. When the control system determines that it is necessary to adjust the position of the second adjustment block 500 to compensate for the centrifugal force generated by the deviation of the centroid of the eccentric crankshaft material from the rotation axis based on the change in material weight or other factors, it controls the second power source 504 to operate, driving the control wheel 503 to rotate, so that the protrusion pushes the second limit head 502 away from the inner wall of the adjustment hole 205, releasing the locked state of the second adjustment block 500. Then, the second adjustment block 500 is driven by the second sliding table 401 to move to a suitable position within the adjustment hole 205, changing its rotation radius, thereby changing the magnitude of the centrifugal force it generates. Finally, the second power source 504 is controlled to reverse the rotation of the control wheel 503, and the second limit head 502 returns to the through hole 501 under the action of a reset device such as a spring (which can be added in the actual design) and fits against the inner wall of the adjustment hole 205 to fix the position of the second adjustment block 500. By adjusting the position of the second adjustment block 500, the centrifugal force it generates is balanced in real time with the centrifugal force generated by the deviation of the centroid of the eccentric crankshaft material from the rotation axis to adapt to the different centrifugal forces generated by different weight materials.

[0055] Compensation mechanical balance equation

[0056]

[0057] In the formula:

[0058] , - Mass of the first and second adjustment blocks (unit: kg) , - Movement radius of the adjustment block (unit: m) - Remaining mass of the material (unit: kg) - Real-time eccentricity (unit: m)

[0059] The chuck 300 includes: a moving groove 301 formed on the surface of the chuck 300, the number of the moving grooves 301 is two, and the two moving grooves 301 are symmetrically distributed with the center of the chuck 300 as the symmetry axis; two movable blocks 302, the two movable blocks 302 are respectively connected in the two moving grooves 301; two displacement sensors 304 respectively installed on the inner walls of the two moving grooves 301, and the displacement sensors 304 are used to detect the displacement difference between the two movable blocks 302; an elastic member 303, and two ends of the elastic member 303 are respectively connected to the movable block 302 and the inner wall of the moving groove 301.

[0060] The above two movable blocks 302 will undergo displacements of different degrees under the influence of the rotational centrifugal force of the chuck 300. Since the movable block 302 closer to the center of the chuck 300 is subjected to a smaller centrifugal force, this centrifugal force causes the movable block 302 in the moving groove 301 of the chuck 300 to overcome the elastic force of the elastic member 303 and generate a displacement. Two displacement sensors 304 respectively detect the displacements of the two movable blocks 302. By calculating the displacement difference, combining the stiffness coefficient of the elastic member 303, the mass of the movable block 302, and the distance difference between the movable block 302 and the rotating shaft of the driving turntable 200, the angular velocity of the driving turntable 200 is calculated. Then, combining the known mass and eccentricity of the eccentric crankshaft material, the centrifugal force generated due to the deviation of the centroid of the eccentric crankshaft material from the rotation axis is calculated. At the same time, according to the mass distribution and angular velocity of the chuck 300, the centrifugal force generated due to the deviation of the centroid of the chuck 300 from the rotation axis can be calculated.

[0061] The first adjusting block 400 includes: a control groove 402, which is opened on the first adjusting block 400; a first limiting head 403, which is installed in the control groove 402. A limiting plate 207 is installed on the inner wall of the adjusting hole 205. The first limiting head 403 is used to fix the position of the first adjusting block 400 in the adjusting hole 205 when it fits with the limiting plate 207; a first power source 404, the output shaft of the first power source 404 is connected to the first limiting head 403, and the first power source 404 is used to provide a driving force for the first limiting head 403; a limiting tooth is connected to one side of the first limiting head 403, and a tooth groove engaged with the limiting tooth is opened on the side of the limiting plate 207 close to the first limiting head 403.

[0062] The above first power source 404 uses a cylinder, and a linear motor can also be used.

[0063] The second adjusting block 500 includes: a through hole 501, which is opened on the second adjusting block 500; two second limiting heads 502, and the two second limiting heads 502 are installed in the through hole 501 and are symmetrically arranged. The second limiting heads 502 are used to fix the position of the second adjusting block 500 in the adjusting hole 205 when they fit with the inner wall of the adjusting hole 205; a control wheel 503, which is arranged in the through hole 501. Two symmetrically arranged protrusions are provided on the control wheel 503. The protrusions are used to push the second limiting heads 502 out of the through hole 501 and contact the inner wall of the adjusting hole 205. A second power source 504 is connected to the second adjusting block 500, and the power shaft of the second power source 504 is connected to the control wheel 503.

[0064] The above second power source 504 uses a cylinder, and a linear motor can also be used.

[0065] A first slide 206 is connected to the inner wall of the adjustment hole 205, and the first adjustment block 400 is connected to the first slide 206; a second slide 401 is installed on the first adjustment block 400, and the first adjustment block 400 is connected to the second adjustment block 500 through the second slide 401.

[0066] Both the above-mentioned first slide 206 and second slide 401 adopt electric slides, or slide cylinder can also be used.

[0067] The processing die further includes: a frame 100, on which the driving turntable 200 is installed; a vibration monitor 101, installed on the frame 100, and the detection axis of the vibration monitor 101 coincides with the rotation axis of the driving turntable 200.

[0068] The vibration monitor 101 adopts a high-precision acceleration sensor, which is installed on the frame 100, and the detection axis coincides with the rotation axis of the driving turntable 200, and can collect the vibration acceleration signal of the driving turntable 200 in real time and accurately. This sensor converts the vibration acceleration signal into an electrical signal, and converts the analog signal into a digital signal through an analog-to-digital converter (ADC) and transmits it to the control system; after receiving the vibration data transmitted by the vibration monitor 101, the control system first preprocesses the data, including operations such as filtering and noise reduction, to remove interference signals and improve the accuracy of the data. Then, the control system judges the unbalanced state of the current processing die according to the preset vibration threshold. For example, when the amplitude of the vibration acceleration exceeds the preset threshold, it is judged that the die is in an unbalanced state; the control system also receives the displacement difference data of the movable block 302 detected by the displacement sensor 304, and calculates the centrifugal force generated by the eccentric crankshaft material and the centroid of the chuck 300 deviating from the rotation axis. The vibration data and the centrifugal force data are fused and analyzed, and the multi-sensor information fusion technology, such as the Kalman filtering algorithm, is used to improve the accuracy of the judgment of the unbalanced state. According to the fused data analysis, the magnitude and direction of the centrifugal force that needs to be compensated are determined.

[0069] The driving turntable 200 includes: a first screw 203, installed in the adjustment groove 201, the first screw 203 is threadedly connected to the adjustment seat 202, and the adjustment seat 202 is driven to move by the first screw 203 with threaded fit; a control head 204, installed at one end of the first screw 203, the control head 204 is arranged on the driving turntable 200, and an internal hexagonal driving interface is provided at one end of the control head 204.

[0070] By rotating the control head 204 with an internal hexagonal tool, the first screw 203 can be driven to rotate, and then the adjustment seat 202 can be driven to move.

[0071] Embodiment 2

[0072] The difference between this embodiment and the first embodiment lies in that with reference to Figure 9 and Figure 10 , the chuck 300 includes: a transition adjustment sleeve 305 installed inside the chuck 300; an eccentric chuck core 306 installed inside the transition adjustment sleeve 305; four fine-tuning jackscrews 307, the four fine-tuning jackscrews 307 penetrate through the chuck 300 and contact the eccentric chuck core 306, the four fine-tuning jackscrews 307 are distributed in a circumferential array, and a fine-tuning nut 308 is connected to the fine-tuning jackscrew 307; a chuck core positioning key 309 installed inside the transition adjustment sleeve 305, the chuck core positioning key 309 is arranged to move inside the transition adjustment sleeve 305 for adjusting the depth of the workpiece inserted into the eccentric chuck core 306; an adjustment jackscrew 310 installed at one end of the eccentric chuck core 306, and the adjustment jackscrew 310 is connected to the chuck core positioning key 309.

[0073] The chuck 300 of this embodiment clamps the workpiece through the eccentric chuck core 306. The eccentricity of the workpiece can be adjusted by finely tuning the four fine-tuning jackscrews 307 on the chuck 300. Rotating the adjustment jackscrew 310 can adjust the position of the chuck core positioning key 309 inside the eccentric chuck core 306, so as to adjust the depth of the workpiece inserted into the eccentric chuck core 306. This operation is simple and the tool change is fast. The single tool change takes 15 minutes, effectively reducing the downtime.

[0074] During the use process, the eccentric crankshaft material to be processed is clamped into the chuck 300, and the material is locked by the jaws of the chuck 300. An internal hexagon tool is inserted into the drive interface of the control head 204, and the first screw 203 is rotated to drive the adjustment seat 202 to move along the adjustment groove 201 to adjust the eccentricity of the chuck 300. The initial mass, target eccentricity and processing speed of the material are input into the control system.

[0075] The drive unit is started to drive the turntable 200 to rotate at a set speed, driving the chuck 300 and the material to rotate synchronously. When the chuck 300 rotates, the two movable blocks 302 generate radial displacement due to the centrifugal force, the displacement sensor 304 detects the displacement difference in real time and calculates the real-time centrifugal force; the vibration monitor 101 collects the vibration acceleration data of the drive turntable 200 in real time.

[0076] When the vibration data or displacement difference indicates that a centrifugal force is generated due to the deviation of the centroid of the chuck 300, the control system starts the compensation process of the first adjustment block 400. The first power source 404 drives the first limit head 403 to disengage from the tooth groove of the limit plate 207 to release the lock; the first sliding table 206 drives the first adjustment block 400 to move in the opposite direction along the adjustment hole 205 (opposite to the moving direction of the adjustment seat 202); the vibration data is monitored in real time until the vibration amplitude drops below the threshold value; the first power source 404 resets, and the limit teeth engage with the tooth groove to lock the position of the first adjustment block 400. When the weight of the material changes due to turning or the initial set eccentric force is unbalanced, the compensation of the second adjustment block 500 is started. The second power source 504 drives the control wheel 503 to rotate, and the protrusion pushes the second limit head 502 to disengage from the inner wall of the adjustment hole 205; the second sliding table 401 drives the second adjustment block 500 to move along the adjustment hole 205 to change its rotation radius; the control wheel 503 rotates in the opposite direction, and the second limit head 502 resets and locks; the detachable counterweight pieces on the surface of the second adjustment block 500 are distributed according to binary mass to achieve hierarchical compensation.

[0077] The control system performs Kalman filter fusion on the displacement difference data, vibration data, and material removal amount (calculated by the turning feed rate) to correct the compensation parameters. The PID algorithm is used to control the moving speed and position of the compensation block; when the vibration acceleration or displacement difference exceeds the limit, the speed is immediately reduced and the compensation block is triggered to move to the maximum compensation position.

[0078] After the machining is completed, the drive turntable 200 is driven to stop rotating, and the first adjustment block 400 and the second adjustment block 500 are reset to their initial positions. The control system automatically records the vibration curve, compensation amount, and machining parameters to generate a quality analysis report.

[0079] In summary, compared with the prior art, the following beneficial effects are achieved:

[0080] In this solution, the vibration monitor 101 collects the vibration acceleration signal of the drive turntable 200 in real time and transmits it to the control system. Using the displacement difference between the movable blocks 302 in the two symmetrically distributed moving grooves 301 on the chuck 300, combined with the stiffness coefficient of the elastic member 303, the mass of the movable block 302, and the distance difference from the axis of the drive turntable 200, the angular velocity of the drive turntable 200 is calculated, and then the centrifugal force generated by the eccentric crankshaft material and the deviation of the centroid of the chuck 300 from the rotation axis is obtained.

[0081] When the control system determines that centrifugal force compensation is required, it can quickly control the first adjustment block 400 and the second adjustment block 500 to act. The first adjustment block 400 releases the locked state through the first power source 404 and moves to a suitable position driven by the first sliding table 206 to compensate for the periodic centrifugal force generated by the deviation of the centroid of the chuck 300 from the rotation axis; the second adjustment block 500 drives the control wheel 503 through the second power source 504, and after unlocking, changes the rotation radius under the action of the second sliding table 401 to compensate for the centrifugal force generated by the deviation of the centroid of the eccentric crankshaft material from the rotation axis.

[0082] This real-time dynamic compensation mechanism can effectively cope with rotational speed fluctuations, greatly reducing the vibration amplitude from the relatively high level of traditional molds, improving the stability of the processing process, avoiding the problem of vibration amplitude exceeding the tolerance, and meeting the requirements of vibration control for high-precision processing.

[0083] Regarding the differences in the weights of different batches of materials, the second adjustment block 500 of this solution plays a key role. Since the second adjustment block 500 can move within the adjustment hole 205, the magnitude of the generated centrifugal force is adjusted by changing its rotation radius.

[0084] The control system can calculate the centrifugal force generated by the current material based on the displacement difference of the movable block 302 detected by the displacement sensor 304 and the data of the vibration monitor 101, and compare it with the preset standard value. When it is determined that the centrifugal force exceeds the allowable range due to the change in the material weight, the control system automatically controls the second power source 504 to work, driving the control wheel 503 to separate the second limit head 502 from the inner wall of the adjustment hole 205. The second adjustment block 500 moves to a suitable position driven by the second sliding table 401 to change the rotation radius, thereby generating a compensation centrifugal force matching the weight of the current material. This process does not require manual intervention during machine stoppage and can automatically complete the adjustment of the compensation force for different batches of materials, greatly improving the processing efficiency, reducing the time waste and operation errors caused by manual intervention, enabling the processing mold to adapt to the weight changes of various materials, and enhancing the versatility and flexibility of the processing.

[0085] During the turning process, as the weight of the material decreases, the centrifugal force generated by the deviation of the centroid of the eccentric crankshaft material from the rotation axis will also change dynamically. This solution uses a real-time monitoring system, namely the displacement sensor 304 and the vibration monitor 101, to continuously provide data for the control system.

[0086] Based on these real-time data, the control system continuously calculates the real-time centrifugal force of the material and compares it with the ideal compensation value. Once a change in the centrifugal force is detected, the adjustment mechanism is immediately activated to online adjust the compensation force by controlling the movement of the second adjustment block 500. The function of online adjusting the compensation force ensures that during the entire turning process, the processing die can always effectively counteract the change in the material centrifugal force, ensuring that the processing accuracy is not affected by the change in the material weight, improving the stability of the processing quality, and overcoming the defect that the traditional processing die cannot adapt to the dynamic change of the material weight during the turning process.

[0087] Therefore, although the present invention has been described herein with reference to its specific embodiments, modifications, various changes and substitutions are also within the above disclosure, and it should be understood that in some cases, some features of the present invention will be adopted without corresponding use of other features without departing from the scope and spirit of the proposed invention. Accordingly, many modifications may be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode contemplated for carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the present invention will be determined only by the appended claims.

Claims

1. A processing die for an eccentric crankshaft, characterized in that, Comprising: A driving turntable (200); A chuck (300), eccentrically mounted on the driving turntable (200), and the chuck (300) is used for clamping eccentric crankshaft materials; An adjustment groove (201), opened on one side of the driving turntable (200), an adjustment seat (202) is connected in the adjustment groove (201), the adjustment seat (202) is connected to the chuck (300), and the adjustment seat (202) is arranged to move in the adjustment groove (201) for adjusting the eccentricity of the chuck (300); An adjustment hole (205), opened on one side of the driving turntable (200), and the adjustment hole (205) is arranged parallel and in the opposite direction to the adjustment groove (201); A first adjustment block (400), connected in the adjustment hole (205), the first adjustment block (400) is arranged to move in the adjustment hole (205), and the first adjustment block (400) is used for compensating in real time the periodic centrifugal force generated due to the deviation of the centroid of the chuck (300) from the rotation axis; A second adjustment block (500), connected in the adjustment hole (205), the second adjustment block (500) is arranged to move in the adjustment hole (205), and the moving directions of the first adjustment block (400) and the second adjustment block (500) are opposite to the moving direction of the adjustment seat (202), and the second adjustment block (500) is used for compensating in real time the periodic centrifugal force generated due to the deviation of the centroid of the eccentric crankshaft material from the rotation axis, and by adjusting the position of the second adjustment block (500), the rotation radius of the second adjustment block (500) is changed to adapt to the different centrifugal forces generated by different weights of materials; The chuck (300) includes: Moving grooves (301), opened on the surface of the chuck (300), the number of the moving grooves (301) is two, and the two moving grooves (301) are symmetrically distributed with the center of the chuck (300) as the symmetry axis; Moving blocks (302), the number of which is two, and the two moving blocks (302) are respectively connected in the two moving grooves (301); Displacement sensors (304), the number of which is two, are respectively installed on the inner walls of the two moving grooves (301), and the displacement sensors (304) are used for detecting the displacement difference between the two moving blocks (302); The chuck (300) further includes: Elastic members (303), with both ends of the elastic members (303) respectively connected to the moving blocks (302) and the inner walls of the moving grooves (301); The first adjustment block (400) includes: A control groove (402), opened on the first adjustment block (400); A first limiting head (403), installed in the control groove (402), a limiting plate (207) is installed on the inner wall of the adjustment hole (205), and the first limiting head (403) is used for fixing the position of the first adjustment block (400) in the adjustment hole (205) when it fits with the limiting plate (207); A first power source (404), the output shaft of the first power source (404) is connected to the first limiting head (403), and the first power source (404) is used for providing driving force for the first limiting head (403); One side of the first limit head (403) is connected with limit teeth, and a tooth groove engaged with the limit teeth is formed on one side of the limit plate (207) close to the first limit head (403). The second adjusting block (500) includes: A through hole (501) formed on the second adjusting block (500); Two second limit heads (502). The two second limit heads (502) are installed in the through hole (501) and are symmetrically arranged. When the second limit heads (502) are used to fit with the inner wall of the adjusting hole (205), the position of the second adjusting block (500) in the adjusting hole (205) is fixed; A control wheel (503) arranged in the through hole (501). Two symmetrically arranged protrusions are provided on the control wheel (503). The protrusions are used to push the second limit heads (502) out of the through hole (501) and contact with the inner wall of the adjusting hole (205). A second power source (504) is connected to the second adjusting block (500), and the power shaft of the second power source (504) is connected to the control wheel (503).

2. The processing die for an eccentric crankshaft according to claim 1, wherein, A first sliding table (206) is connected to the inner wall of the adjusting hole (205), and the first adjusting block (400) is connected to the first sliding table (206); A second sliding table (401) is installed on the first adjusting block (400), and the first adjusting block (400) is connected to the second adjusting block (500) through the second sliding table (401).

3. The processing die for the eccentric crankshaft according to claim 1, characterized in that, The processing die further includes: A frame (100) on which the driving turntable (200) is installed; A vibration monitor (101) installed on the frame (100), and the detection axis of the vibration monitor (101) coincides with the rotation axis of the driving turntable (200).

4. The processing die for an eccentric crankshaft according to claim 1, characterized in that, The driving turntable (200) includes: A first screw (203) installed in the adjusting groove (201). The first screw (203) is threadedly connected with the adjusting seat (202), and the adjusting seat (202) is driven to move by the first screw (203) through threaded cooperation; A control head (204) installed at one end of the first screw (203). The control head (204) is arranged on the driving turntable (200), and an internal hexagonal driving interface is formed at one end of the control head (204).

5. The processing die for an eccentric crankshaft according to claim 1, characterized in that, The chuck (300) includes: A transition adjusting sleeve (305) installed in the chuck (300); An eccentric chuck core (306) installed in the transition adjusting sleeve (305); Four fine-tuning set screws (307). The four fine-tuning set screws (307) penetrate through the chuck (300) and contact with the eccentric chuck core (306). The four fine-tuning set screws (307) are arranged in a circumferential array, and fine-tuning nuts (308) are connected to the fine-tuning set screws (307); A chuck core positioning key (309) installed in the transition adjusting sleeve (305). The chuck core positioning key (309) is arranged to move in the transition adjusting sleeve (305) and is used to adjust the depth of the workpiece inserted into the eccentric chuck core (306); An adjusting set screw (310) installed at one end of the eccentric chuck core (306), and the adjusting set screw (310) is connected to the chuck core positioning key (309).

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