Method for dynamic balancing of a three-cylinder crankshaft

Abstract

The application discloses a three-cylinder crankshaft dynamic balance adjustment method, which comprises the following steps: compiling a standard calculation table, then recording the related eccentricity measurement values of five crankshafts at OP10, and processing to OP145 to obtain the eccentricity compensation value correction values of the five crankshafts, and inputting the data into the calculation table to calculate the actual results of the eccentricity of the five crankshafts after compensation, and making early prediction. The application adopts the dynamic balance compensation value pre-calculation method (budget) to make early prediction of the eccentricity, and then reversely simulates the compensation value through the obtained eccentricity, so that the process eccentricity is qualified, and the final dynamic balance is qualified.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of quality adjustment of engine crankshaft dynamic balance, and particularly relates to a three-cylinder crankshaft dynamic balance adjustment method, which is especially suitable for three-cylinder crankshafts with unbalanced amount difficult to control. The appropriate compensation value is obtained offline in advance through budgeting, reverse deduction and verification of the dynamic balance compensation value, so as to reduce the generation of unqualified products and adjustment waste, and improve the adjustment efficiency. BACKGROUND

[0002] The machining process scheme sequence for the three-cylinder crankshaft balance of the certain engine is as follows: the blank is measured for the mass center on the OP10 process, and then two end center holes are machined on the mass center by a special machine. The eccentricity between the mass center and the geometric center is required to be less than or equal to 0.8 mm.

[0003] When the crankshaft is machined to the OP145 process, the unbalance amount of the crankshaft is measured at the measuring station, and then the hole is drilled for weight reduction at the machining station. The dynamic balance amount of the crankshaft after weight reduction is required to be less than or equal to 20 g·cm. This process scheme is usually adopted by most mainstream automobile manufacturers.

[0004] Relationship between OP10 process and OP145 process:

[0005] (1) The OP10 process measures and machines the mass center hole of the crankshaft, and the center hole is used as the reference for machining and removing the raw material from the OP10 process to the OP145 process. The position of the center hole determines how much raw material is removed in the circumferential direction of the crankshaft, which will inevitably affect the unbalance amount of the OP145 process. If the position is not good, the OP145 process cannot be weight-reduced or the unbalance amount after weight reduction is greater than 20 g·cm.

[0006] (2) In order to obtain the ideal unbalance amount of the OP145 process, the unbalance amount of the crankshaft is measured before weight reduction in the OP145 process, and a compensation value correction value of the eccentricity is given. The compensation value correction value is manually input to the OP10 process machine when needed, so as to correct the position of the center hole machined by the OP10 process, thereby compensating for the influence of the removal of the raw material of the crankshaft on the unbalance amount of the OP145 process.

[0007] (3) The compensation value correction value is a bridge between the machining position of the mass center hole of the OP10 process and the unbalance amount of the OP145 process, so the quality of the compensation value correction value will inevitably affect the results of the OP10 process and the OP145 process.

[0008] The specific steps of the original method for adjusting the dynamic balance of the crankshaft in the prior art include (see Figure 1 ):

[0009] I0) find that the dynamic balance of the OP145 crankshaft after weight reduction is unqualified;

[0010] I1) Randomly measure 5 OP145 parts before de-weighting to obtain a compensation value correction value;

[0011] I2) Manually input the compensation value correction value into the OP10 machine;

[0012] I3) Check whether the eccentricity of 5 crankshafts machined on the OP10 is less than or equal to 0.8 mm;

[0013] I4) If less than or equal to 0.8, then machine the 5 crankshafts on the OP10 to obtain a new compensation value correction value before de-weighting on the OP145 and check whether the unbalance of the crankshafts is less than or equal to 20 g-cm;

[0014] I5) If greater than 0.8 mm, then compromise the eccentricity tolerance of the process and then machine, re-measure and evaluate the compensation value correction value before de-weighting on the OP145 after machining, and perform dynamic balancing de-weighting;

[0015] I6) If the OP145 dynamic balancing is less than or equal to 20 g-cm, whether the result of I3 is YES or NO, enter I7 for normal production, and if greater than 20 g-cm, input the new compensation value correction value obtained on the OP145 into the OP10 to start from step I2 again until both the eccentricity of the OP10 and the dynamic balancing of the OP145 are qualified.

[0016] The above-mentioned adjustment method for dynamic balancing of crankshafts has the following defects in actual production:

[0017] (1) When adjustment is qualified for normal production, since there is a dispersion of parts, a large number of crankshafts on the OP10 still have eccentricity > 0.8, which is unqualified, and are scrapped due to being caught by the machine, which seriously affects production.

[0018] (2) In order to produce, the eccentricity tolerance of the OP10 process is enlarged, which not only cannot meet the requirements of the OP10 process, but also causes black skin during subsequent machining and unqualified position and size of the balancing block, resulting in waste products, and even the OP145 cannot be dynamically balanced to be qualified.

[0019] (3) In order to meet the requirement of OP10 eccentricity ≤ 0.8, compensation value compensation is continuously performed, which takes a long time and has low efficiency.

[0020] (4) Adjustment requires a large number of parts to be machined for trial cutting, resulting in a large amount of waste products.

[0021] (5) It is very difficult to meet the requirements of both OP10 and OP145 being qualified at the same time, and only the manufacturing precision of the blank can be improved, which will inevitably increase the cost of the blank.

[0022] Therefore, when the unqualified quality problem of dynamic balance occurs, it is urgent to find out the method for adjusting the dynamic balance of the three-cylinder crankshaft, so that the adjustment can be quickly and effectively realized, the product requirements can be met, and the generation of unqualified products and adjustment waste can be reduced. SUMMARY

[0023] In view of the problems in the prior art, the present application provides a new method for adjusting the dynamic balance of a three-cylinder crankshaft.

[0024] The present application discloses a method for adjusting the dynamic balance of a three-cylinder crankshaft, comprising

[0025] OP10, measuring the mass center of the crankshaft, and then machining the mass center holes of the flange end and the small head end of the crankshaft on the mass center of the crankshaft through a drilling machine;

[0026] OP145, measuring the unbalance of the crankshaft at the measuring station, and then drilling holes to remove weight at the machining station, wherein the dynamic balance of the crankshaft after weight removal is less than or equal to 20g·cm;

[0027] When the dynamic balance of the crankshaft after weight removal is greater than 20g·cm, the following steps are entered:

[0028] J1, measuring 5 crankshafts at the OP10 process to obtain the blank flange end V-direction eccentricity, blank flange end H-direction eccentricity, blank small head end V-direction eccentricity, and blank small head end H-direction eccentricity of the 5 crankshafts; calculating the flange end V-direction net eccentricity based on the blank flange end V-direction eccentricity, the squirrel cage flange end V-direction compensation, the OP145 flange end V-direction compensation, and the connecting rod mechanism flange end V-direction compensation; calculating the flange end H-direction net eccentricity based on the blank flange end H-direction eccentricity, the squirrel cage flange end H-direction compensation, the OP145 flange end H-direction compensation, and the connecting rod mechanism flange end H-direction compensation; calculating the total eccentricity of the flange end based on the flange end V-direction net eccentricity and the flange end H-direction net eccentricity; calculating the small head end V-direction net eccentricity based on the blank small head end V-direction eccentricity, the squirrel cage small head end V-direction compensation, the OP145 small head end V-direction compensation, and the connecting rod mechanism small head end V-direction compensation; calculating the small head end H-direction net eccentricity based on the blank small head end H-direction eccentricity, the squirrel cage small head end H-direction compensation, the OP145 small head end H-direction compensation, and the connecting rod mechanism small head end H-direction compensation; and calculating the total eccentricity of the small head end based on the small head end V-direction net eccentricity and the small head end H-direction net eccentricity;

[0029] J2, machining the 5 crankshafts to OP145 process, measure and obtain the flange end V direction correction value, the flange end H direction correction value, the small end V direction correction value, the small end H direction correction value of the 5 crankshafts before weight removal;

[0030] J3, the first corrected OP145 flange end V direction compensation amount = the OP145 flange end V direction compensation amount in J1 + the flange end V direction correction value; the first corrected OP145 flange end H direction compensation amount = the OP145 flange end H direction compensation amount in J1 + the flange end H direction correction value; the first corrected OP145 small end V direction compensation amount = the OP145 small end V direction compensation amount in J1 + the small end V direction correction value; the first corrected small end H direction compensation amount in J1 = the small end H direction compensation amount in J1 in J1 + the small end H direction correction value;

[0031] J4, based on the blank flange end V direction eccentricity, the mouse cage flange end V direction compensation, the OP145 flange end V direction compensation after the first correction in J3, the connecting rod mechanism flange end V direction compensation, the flange end V direction net eccentricity is calculated, based on the blank flange end H direction eccentricity, the mouse cage flange end H direction compensation, the OP145 flange end H direction compensation after the first correction in J3, the connecting rod mechanism flange end H direction compensation, the flange end H direction net eccentricity is calculated, based on the flange end V direction net eccentricity and the flange end H direction net eccentricity, the flange end total eccentricity is calculated; Based on the blank small end V direction eccentricity, the mouse cage small end V direction compensation, the OP145 small end V direction compensation after the first correction in J3, the connecting rod mechanism small end V direction compensation, the small end V direction net eccentricity is calculated, based on the blank small end H direction eccentricity, the mouse cage small end H direction compensation, the OP145 small end H direction compensation after the first correction in J3, the connecting rod mechanism small end H direction compensation, the small end H direction net eccentricity is calculated, based on the small end V direction net eccentricity and the small end H direction net eccentricity, the small end total eccentricity is calculated; Based on the above parameters, the average value of the blank flange end V direction eccentricity, the average value of the mouse cage flange end V direction compensation, the average value of the OP145 flange end V direction compensation, the average value of the connecting rod mechanism flange end V direction compensation, the average value of the flange end V direction net eccentricity, the average value of the blank flange end H direction eccentricity, the average value of the mouse cage flange end H direction compensation, the average value of the OP145 flange end H direction compensation, the average value of the connecting rod mechanism flange end H direction compensation, the average value of the flange end H direction net eccentricity, the average value of the blank small end V direction eccentricity, the average value of the mouse cage small end V direction compensation, the average value of the OP145 small end V direction compensation, the average value of the connecting rod mechanism small end V direction compensation, the average value of the small end V direction net eccentricity, the average value of the blank small end H direction eccentricity, the average value of the mouse cage small end H direction compensation, the average value of the OP145 small end H direction compensation, the average value of the connecting rod mechanism small end H direction compensation, the average value of the small end H direction net eccentricity, the average value of the flange end total eccentricity, the average value of the small end total eccentricity are calculated;

[0032] J5, when all the flange end total eccentricity of the 5 crankshafts in J4 is ≤0.5mm and all the small end total eccentricity is ≤0.5mm, no budget adjustment is made, and J9 is entered;

[0033] J6, when the total flange end or total small end eccentricity of at least one of the five crankshafts is > 0.5 mm and the maximum total flange end or total small end eccentricity of the five crankshafts is > 0.8 mm, assign the total flange end or total small end eccentricity = k, 0.36≤k≤0.5, the flange end correction factor = k / the average of the total flange end eccentricity of J4, the small end correction factor = k / the average of the total small end eccentricity of J4, enter J8;

[0034] J7, when the total flange end or total small end eccentricity of at least one of the five crankshafts is > 0.5 mm and the maximum total flange end or small end eccentricity of the five crankshafts is ≤ 0.8 mm, assign the total flange end or total small end eccentricity = k, k = 0.6, the flange end correction factor = k / the average of the total flange end eccentricity of J4, the small end correction factor = k / the average of the total small end eccentricity of J4, enter J8;

[0035] J8, the average of the adjusted flange end V-direction net eccentricity = the average of the flange end V-direction net eccentricity in J4 * the flange end correction factor in J5, the average of the adjusted flange end H-direction net eccentricity = the average of the flange end H-direction net eccentricity in J4 * the flange end correction factor in J5, the average of the adjusted small end V-direction net eccentricity = the average of the small end V-direction net eccentricity in J4 * the small end correction factor in J5, the average of the adjusted small end H-direction net eccentricity = the average of the small end H-direction net eccentricity in J4 * the small end correction factor in J5;

[0036] The adjusted OP145 flange end V-direction compensation is obtained by the average of the blank flange end V-direction eccentricity in J4, the average of the squirrel cage flange end V-direction compensation in J4, the average of the connecting rod mechanism flange end V-direction compensation in J4, the average of the adjusted flange end V-direction net eccentricity, the adjusted OP145 flange end H-direction compensation is obtained by the average of the blank flange end H-direction eccentricity in J4, the average of the squirrel cage flange end H-direction compensation in J4, the average of the connecting rod mechanism flange end H-direction compensation in J4, the average of the adjusted flange end H-direction net eccentricity, the adjusted OP145 small end V-direction compensation is obtained by the average of the blank small end V-direction eccentricity in J4, the average of the squirrel cage small end V-direction compensation in J4, the average of the connecting rod mechanism small end V-direction compensation in J4, the average of the adjusted flange end V-direction net eccentricity, the adjusted OP145 small end H-direction compensation is obtained by the average of the blank small end H-direction eccentricity in J4, the average of the squirrel cage small end H-direction compensation in J4, the average of the connecting rod mechanism small end H-direction compensation in J4, the average of the adjusted small end H-direction net eccentricity;

[0037] For each crankshaft, the net eccentricity of the flange end in the V direction is calculated based on the blank flange end V direction eccentricity in J4, the squirrel cage flange end V direction compensation in J4, the adjusted OP145 flange end V direction compensation, and the connecting rod mechanism flange end V direction compensation in J4, the net eccentricity of the flange end in the H direction is calculated based on the blank flange end H direction eccentricity in J4, the squirrel cage flange end H direction compensation in J4, the adjusted OP145 flange end H direction compensation, and the connecting rod mechanism flange end H direction compensation in J4, and the total eccentricity of the flange end is calculated based on the net eccentricity of the flange end in the V direction and the net eccentricity of the flange end in the H direction; the net eccentricity of the small end in the V direction is calculated based on the blank small end V direction eccentricity in J4, the squirrel cage small end V direction compensation in J4, the adjusted OP145 small end V direction compensation, and the connecting rod mechanism small end V direction compensation in J4, the net eccentricity of the small end in the H direction is calculated based on the blank small end H direction eccentricity in J4, the squirrel cage small end H direction compensation in J4, the adjusted OP145 small end H direction compensation, and the connecting rod mechanism small end H direction compensation in J4, and the total eccentricity of the small end is calculated based on the net eccentricity of the small end in the V direction and the net eccentricity of the small end in the H direction.

[0038] J9, the final correction parameter is input to OP10; if the total eccentricity of the flange end of each crankshaft in J8 is less than or equal to 0.8mm and the total eccentricity of the small end is less than or equal to 0.8mm, then the eccentricity of the blank after the reverse adjustment of the parameters meets the process requirement value, and the final correction parameter is determined as OP145 flange end V direction compensation correction value = adjusted OP145 flange end V direction compensation in J8 - OP145 flange end V direction compensation in J1, OP145 flange end H direction compensation correction value = adjusted OP145 flange end H direction compensation in J8 - OP145 flange end H direction compensation in J1, OP145 small end V direction compensation correction value = adjusted OP145 small end V direction compensation in J8 - OP145 small end V direction compensation in J1, and OP145 small end H direction compensation correction value = adjusted OP145 small end H direction compensation in J8 - OP145 small end H direction compensation in J1; if the total eccentricity of the flange end and the total eccentricity of the small end of the five crankshafts in J4 are less than or equal to 0.5mm, the final correction parameter is determined as OP145 flange end V direction compensation correction value = flange end V direction correction value in J2, OP145 flange end H direction compensation correction value = flange end H direction correction value in J2, OP145 small end V direction compensation correction value = small end V direction correction value in J2, and OP145 small end H direction compensation correction value = small end H direction correction value in J2.

[0039] In a preferred embodiment of the present application, in J6, when the total flange end eccentricity or the total big end eccentricity of at least one of the five crankshafts is > 0.5 mm, and the maximum value of the total flange end eccentricity or the maximum value of the total big end eccentricity of the five crankshafts is greater than 0.8 mm, then the first assignment is k = 0.5, and the value of the total flange end eccentricity and the total big end eccentricity is assigned as 0.5 - 0.02 * cycle number in each cycle.

[0040] In a preferred embodiment of the present application, in J7, when the total flange end eccentricity or the total big end eccentricity of at least one of the five crankshafts is > 0.5 mm, and the maximum value of the total flange end eccentricity or the maximum value of the total big end eccentricity of the five crankshafts is less than or equal to 0.8 mm, then k is directly assigned as 0.6.

[0041] In a preferred embodiment of the present application, in J1,

[0042] The net flange end V-direction eccentricity = the blank flange end V-direction eccentricity - the squirrel cage flange end V-direction compensation - the OP145 flange end V-direction compensation - the connecting rod mechanism flange end V-direction compensation;

[0043] The net flange end H-direction eccentricity = the blank flange end H-direction eccentricity - the squirrel cage flange end H-direction compensation - the OP145 flange end H-direction compensation - the connecting rod mechanism flange end H-direction compensation;

[0044] The net big end V-direction eccentricity = the blank big end V-direction eccentricity - the squirrel cage big end V-direction compensation - the OP145 big end V-direction compensation - the connecting rod mechanism big end V-direction compensation;

[0045] The net big end H-direction eccentricity = the blank big end H-direction eccentricity - the squirrel cage big end H-direction compensation - the OP145 big end H-direction compensation - the connecting rod mechanism big end H-direction compensation;

[0046]

[0047]

[0048] In a preferred embodiment of the present application, in J4,

[0049] The net flange end V-direction eccentricity = the blank flange end V-direction eccentricity - the squirrel cage flange end V-direction compensation - the OP145 flange end V-direction compensation after the first correction in J3 - the connecting rod mechanism flange end V-direction compensation;

[0050] The net flange end H-direction eccentricity = the blank flange end H-direction eccentricity - the squirrel cage flange end H-direction compensation - the OP145 flange end H-direction compensation after the first correction in J3 - the connecting rod mechanism flange end H-direction compensation;

[0051] Net eccentricity of small end in V direction = eccentricity of small end in V direction of blank - compensation of small end in V direction of cage - first corrected OP145 compensation of small end in V direction in J3 - compensation of small end in V direction of linkage mechanism;

[0052] Net eccentricity of small end in H direction = eccentricity of small end in H direction of blank - compensation of small end in H direction of cage - first corrected OP145 compensation of small end in H direction in J3 - compensation of small end in H direction of linkage mechanism;

[0053]

[0054]

[0055]

[0056]

[0057] In a preferred embodiment of the present application, in J8,

[0058] Adjusted OP145 compensation of flange end in V direction = average of eccentricity of flange end in V direction of blank in J4 - average of compensation of flange end in V direction of cage in J4 - average of compensation of flange end in V direction of linkage mechanism in J4 - average of adjusted net eccentricity of flange end in V direction,

[0059] Adjusted OP145 compensation of flange end in H direction = average of eccentricity of flange end in H direction of blank in J4 - average of compensation of flange end in H direction of cage in J4 - average of compensation of flange end in H direction of linkage mechanism in J4 - average of adjusted net eccentricity of flange end in H direction,

[0060] Adjusted OP145 compensation of small end in V direction = average of eccentricity of small end in V direction of blank in J4 - average of compensation of small end in V direction of cage in J4 - average of compensation of small end in V direction of linkage mechanism in J4 - average of adjusted net eccentricity of small end in V direction,

[0061] Adjusted OP145 compensation of small end in H direction = average of eccentricity of small end in H direction of blank in J4 - average of compensation of small end in H direction of cage in J4 - average of compensation of small end in H direction of linkage mechanism in J4 - average of adjusted net eccentricity of small end in H direction.

[0062] In a preferred embodiment of the present application, in J8,

[0063] Net eccentricity of flange end in V direction = eccentricity of flange end in V direction in J4 raw part - compensation of flange end in V direction in J4 rotor cage - compensation of flange end in V direction in OP145 after adjustment - compensation of flange end in V direction in J4 connecting rod mechanism;

[0064] Net eccentricity of flange end in H direction = eccentricity of flange end in H direction in J4 raw part - compensation of flange end in H direction in J4 rotor cage - compensation of flange end in H direction in OP145 after adjustment - compensation of flange end in H direction in J4 connecting rod mechanism;

[0065] Net eccentricity of small end in V direction = eccentricity of small end in V direction in J4 raw part - compensation of small end in V direction in J4 rotor cage - compensation of small end in V direction in OP145 after adjustment - compensation of small end in V direction in J4 connecting rod mechanism;

[0066] Net eccentricity of small end in H direction = eccentricity of small end in H direction in J4 raw part - compensation of small end in H direction in J4 rotor cage - compensation of small end in H direction in OP145 after adjustment - compensation of small end in H direction in J4 connecting rod mechanism;

[0067]

[0068]

[0069] In a preferred embodiment of the present application, J10, the new 5 pieces of crankshaft are measured again at OP10 process and the eccentricity parameter output results are recorded, preparing for subsequent possible budget adjustment.

[0070] In a preferred embodiment of the present application, J11, the new 5 pieces of crankshaft are processed to OP145 process, and the new compensation value correction value of the eccentricity of the new 5 pieces of crankshaft before weight reduction is evaluated, preparing for subsequent possible budget adjustment.

[0071] In a preferred embodiment of the present application, after the above-mentioned new 5 pieces of crankshaft are processed in OP145 process, it is checked whether the dynamic balance is qualified, if qualified, it enters J13 step for normal production, if not qualified, it returns to J3 step to re-perform new budget cycle until the dynamic balance of OP145 for 5 pieces is qualified.

[0072] The beneficial effects of the present application are: the present application prepares a standard calculation table, then records the relevant measurement values of the 5 crankshafts at OP10, and processes to OP145 to obtain the compensation value correction value of the 5 crankshafts, and the data is input into the calculation table to calculate the actual result of the compensation of the 5 crankshafts, and the pre-judgment is made: (A) the eccentricity of the 5 crankshafts is less than or equal to 0.5 (67% of 0.8 is taken as the tolerance trust area), and the compensation value correction value can be directly input to OP10 for subsequent processing verification. If the verification is OK, even if the parts have dispersion, the eccentricity 0.5 still has a large margin compared with the actual tolerance 0.8. (B) the eccentricity of the 5 crankshafts is greater than 0.5, greater than 0.8, etc., which is caused by the blank dispersion, at this time, the average value of the eccentricity of the 5 crankshafts is calculated, the dispersion influence is eliminated, the eccentricity is reversely calculated and gradually compressed by using the function of the calculation table, and the new compensation value is budgeted, and then the subsequent processing verification is carried out. If the verification is OK, the budgeted compensation value is used as the appropriate compensation value.

[0073] The present application adopts the pre-calculation method (budget) of dynamic balance compensation value to pre-judge the eccentricity, and then reversely simulates the compensation value by the obtained eccentricity, so that the process eccentricity is qualified, and the final dynamic balance is qualified. As can be seen, the present application greatly reduces the waste rate of the three-cylinder crankshaft, improves the adjustment efficiency of the three-cylinder crankshaft dynamic balance, and has the advantages of convenience and practicality. BRIEF DESCRIPTION OF DRAWINGS

[0074] Figure 1 is a flowchart in the prior art;

[0075] Figure 2 is a flowchart of a three-cylinder crankshaft dynamic balance adjustment method of the present application;

[0076] Figure 3 is a flange end V direction and flange end H direction schematic diagram of the three-cylinder crankshaft dynamic balance adjustment method of the present application. DETAILED DESCRIPTION

[0077] The technical solutions (including preferred technical solutions) of the present application will be further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0078] The present application discloses a three-cylinder crankshaft dynamic balance adjustment method, comprising

[0079] OP10 process, measuring the mass center of the crankshaft, and then drilling the mass center hole of the flange end and the lower head end of the crankshaft by a drilling machine;

[0080] OP145 process, first measuring the unbalance of the crankshaft at the measuring station, and then drilling the hole for weight removal at the machining station, and the dynamic balance of the crankshaft after weight removal is less than or equal to 20 g·cm;

[0081] When the dynamic balance of the crankshaft after weight removal is greater than 20 g·cm, the following steps are entered:

[0082] J1, first measure 5 crankshafts at the OP10 process, obtain the blank flange end V direction eccentricity, blank flange end H direction eccentricity, blank small head end V direction eccentricity, and blank small head end H direction eccentricity of the 5 crankshafts; calculate the flange end V direction net eccentricity based on the blank flange end V direction eccentricity, the squirrel cage flange end V direction compensation, the OP145 flange end V direction compensation, and the connecting rod mechanism flange end V direction compensation, calculate the flange end H direction net eccentricity based on the blank flange end H direction eccentricity, the squirrel cage flange end H direction compensation, the OP145 flange end H direction compensation, and the connecting rod mechanism flange end H direction compensation, and calculate the total eccentricity of the flange end based on the flange end V direction net eccentricity and the flange end H direction net eccentricity; calculate the small head end V direction net eccentricity based on the blank small head end V direction eccentricity, the squirrel cage small head end V direction compensation, the OP145 small head end V direction compensation, and the connecting rod mechanism small head end V direction compensation, calculate the small head end H direction net eccentricity based on the blank small head end H direction eccentricity, the squirrel cage small head end H direction compensation, the OP145 small head end H direction compensation, and the connecting rod mechanism small head end H direction compensation, and calculate the total eccentricity of the small head end based on the small head end V direction net eccentricity and the small head end H direction net eccentricity;

[0083] J2, machining the 5 crankshafts to the OP145 process, and measuring and obtaining the flange end V direction correction value, the flange end H direction correction value, the small head end V direction correction value, and the small head end H direction correction value of the 5 crankshafts before weight removal;

[0084] J3, the first corrected OP145 flange end V direction compensation = the OP145 flange end V direction compensation in J1 + the flange end V direction correction value; the first corrected OP145 flange end H direction compensation = the OP145 flange end H direction compensation in J1 + the flange end H direction correction value; the first corrected OP145 small head end V direction compensation = the OP145 small head end V direction compensation in J1 + the small head end V direction correction value; the first corrected small head end H direction compensation in J1 = the small head end H direction compensation in J1 in J1 + the small head end H direction correction value;

[0085] J4, based on the blank flange end V direction eccentricity, the mouse cage flange end V direction compensation, the OP145 flange end V direction compensation after the first correction in J3, the connecting rod mechanism flange end V direction compensation, the flange end V direction net eccentricity is calculated, based on the blank flange end H direction eccentricity, the mouse cage flange end H direction compensation, the OP145 flange end H direction compensation after the first correction in J3, the connecting rod mechanism flange end H direction compensation, the flange end H direction net eccentricity is calculated, based on the flange end V direction net eccentricity and the flange end H direction net eccentricity, the flange end total eccentricity is calculated; Based on the blank small end V direction eccentricity, the mouse cage small end V direction compensation, the OP145 small end V direction compensation after the first correction in J3, the connecting rod mechanism small end V direction compensation, the small end V direction net eccentricity is calculated, based on the blank small end H direction eccentricity, the mouse cage small end H direction compensation, the OP145 small end H direction compensation after the first correction in J3, the connecting rod mechanism small end H direction compensation, the small end H direction net eccentricity is calculated, based on the small end V direction net eccentricity and the small end H direction net eccentricity, the small end total eccentricity is calculated; Based on the above parameters, the average value of the blank flange end V direction eccentricity, the average value of the mouse cage flange end V direction compensation, the average value of the OP145 flange end V direction compensation, the average value of the connecting rod mechanism flange end V direction compensation, the average value of the flange end V direction net eccentricity, the average value of the blank flange end H direction eccentricity, the average value of the mouse cage flange end H direction compensation, the average value of the OP145 flange end H direction compensation, the average value of the connecting rod mechanism flange end H direction compensation, the average value of the flange end H direction net eccentricity, the average value of the blank small end V direction eccentricity, the average value of the mouse cage small end V direction compensation, the average value of the OP145 small end V direction compensation, the average value of the connecting rod mechanism small end V direction compensation, the average value of the small end V direction net eccentricity, the average value of the blank small end H direction eccentricity, the average value of the mouse cage small end H direction compensation, the average value of the OP145 small end H direction compensation, the average value of the connecting rod mechanism small end H direction compensation, the average value of the small end H direction net eccentricity, the average value of the flange end total eccentricity, the average value of the small end total eccentricity are calculated;

[0086] J5, when all the flange end total eccentricity of the 5 crankshafts in J4 is ≤0.5mm and all the small end total eccentricity is ≤0.5mm, no budget adjustment is made, and J9 is entered;

[0087] J6, when the total flange end or total small end eccentricity of at least one of the five crankshafts is > 0.5 mm and the maximum total flange end or total small end eccentricity of the five crankshafts is > 0.8 mm, assign the total flange end or total small end eccentricity = k, 0.36≤k≤0.5, the flange end correction factor = k / the average of the total flange end eccentricity of J4, the small end correction factor = k / the average of the total small end eccentricity of J4, enter J8;

[0088] J7, when the total flange end or total small end eccentricity of at least one of the five crankshafts is > 0.5 mm and the maximum total flange end or small end eccentricity of the five crankshafts is ≤ 0.8 mm, assign the total flange end or total small end eccentricity = k, k = 0.6, the flange end correction factor = k / the average of the total flange end eccentricity of J4, the small end correction factor = k / the average of the total small end eccentricity of J4, enter J8;

[0089] J8, the average of the adjusted flange end V-direction net eccentricity = the average of the flange end V-direction net eccentricity in J4 * the flange end correction factor in J5, the average of the adjusted flange end H-direction net eccentricity = the average of the flange end H-direction net eccentricity in J4 * the flange end correction factor in J5, the average of the adjusted small end V-direction net eccentricity = the average of the small end V-direction net eccentricity in J4 * the small end correction factor in J5, the average of the adjusted small end H-direction net eccentricity = the average of the small end H-direction net eccentricity in J4 * the small end correction factor in J5;

[0090] The adjusted OP145 flange end V-direction compensation is obtained by the average of the blank flange end V-direction eccentricity in J4, the average of the cage flange end V-direction compensation in J4, the average of the connecting rod mechanism flange end V-direction compensation in J4, the average of the adjusted flange end V-direction net eccentricity, the adjusted OP145 flange end H-direction compensation is obtained by the average of the blank flange end H-direction eccentricity in J4, the average of the cage flange end H-direction compensation in J4, the average of the connecting rod mechanism flange end H-direction compensation in J4, the average of the adjusted flange end H-direction net eccentricity, the adjusted OP145 small end V-direction compensation is obtained by the average of the blank small end V-direction eccentricity in J4, the average of the cage small end V-direction compensation in J4, the average of the connecting rod mechanism small end V-direction compensation in J4, the average of the adjusted flange end V-direction net eccentricity, the adjusted OP145 small end H-direction compensation is obtained by the average of the blank small end H-direction eccentricity in J4, the average of the cage small end H-direction compensation in J4, the average of the connecting rod mechanism small end H-direction compensation in J4, the average of the adjusted small end H-direction net eccentricity;

[0091] For each crankshaft, the net eccentricity of the flange end in the V direction is calculated based on the blank flange end V direction eccentricity in J4, the squirrel cage flange end V direction compensation in J4, the adjusted OP145 flange end V direction compensation, and the connecting rod mechanism flange end V direction compensation in J4, the net eccentricity of the flange end in the H direction is calculated based on the blank flange end H direction eccentricity in J4, the squirrel cage flange end H direction compensation in J4, the adjusted OP145 flange end H direction compensation, and the connecting rod mechanism flange end H direction compensation in J4, and the total eccentricity of the flange end is calculated based on the net eccentricity of the flange end in the V direction and the net eccentricity of the flange end in the H direction; the net eccentricity of the small end in the V direction is calculated based on the blank small end V direction eccentricity in J4, the squirrel cage small end V direction compensation in J4, the adjusted OP145 small end V direction compensation, and the connecting rod mechanism small end V direction compensation in J4, the net eccentricity of the small end in the H direction is calculated based on the blank small end H direction eccentricity in J4, the squirrel cage small end H direction compensation in J4, the adjusted OP145 small end H direction compensation, and the connecting rod mechanism small end H direction compensation in J4, and the total eccentricity of the small end is calculated based on the net eccentricity of the small end in the V direction and the net eccentricity of the small end in the H direction.

[0092] J9, the final correction parameter is input to OP10; if the total eccentricity of the flange end of each crankshaft in J8 is less than or equal to 0.8mm and the total eccentricity of the small end is less than or equal to 0.8mm, then the eccentricity of the blank after the reverse adjustment of the parameters meets the process requirement value, and the final correction parameter is determined as OP145 flange end V direction compensation correction value = adjusted OP145 flange end V direction compensation in J8 - OP145 flange end V direction compensation in J1, OP145 flange end H direction compensation correction value = adjusted OP145 flange end H direction compensation in J8 - OP145 flange end H direction compensation in J1, OP145 small end V direction compensation correction value = adjusted OP145 small end V direction compensation in J8 - OP145 small end V direction compensation in J1, and OP145 small end H direction compensation correction value = adjusted OP145 small end H direction compensation in J8 - OP145 small end H direction compensation in J1; if the total eccentricity of the flange end and the total eccentricity of the small end of the five crankshafts in J4 are less than or equal to 0.5mm, the final correction parameter is determined as OP145 flange end V direction compensation correction value = flange end V direction correction value in J2, OP145 flange end H direction compensation correction value = flange end H direction correction value in J2, OP145 small end V direction compensation correction value = small end V direction correction value in J2, and OP145 small end H direction compensation correction value = small end H direction correction value in J2.

[0093] Preferably, in J6, when the total flange end eccentricity or the total big end eccentricity of at least one of the five crankshafts is > 0.5 mm, and the maximum value of the total flange end eccentricity or the maximum value of the total big end eccentricity of the five crankshafts is greater than 0.8 mm, the first time k is assigned = 0.5, and the value of the total flange end eccentricity and the total big end eccentricity is assigned = 0.5 - 0.02*cycle number in each cycle.

[0094] Preferably, in J7, when the total flange end eccentricity or the total big end eccentricity of at least one of the five crankshafts is > 0.5 mm, and the maximum value of the total flange end eccentricity or the maximum value of the total big end eccentricity of the five crankshafts is less than or equal to 0.8 mm, k is directly assigned 0.6.

[0095] Preferably, in J1,

[0096] The net flange end V-direction eccentricity = the blank flange end V-direction eccentricity - the squirrel cage flange end V-direction compensation - the OP145 flange end V-direction compensation - the connecting rod mechanism flange end V-direction compensation;

[0097] The net flange end H-direction eccentricity = the blank flange end H-direction eccentricity - the squirrel cage flange end H-direction compensation - the OP145 flange end H-direction compensation - the connecting rod mechanism flange end H-direction compensation;

[0098] The net big end V-direction eccentricity = the blank big end V-direction eccentricity - the squirrel cage big end V-direction compensation - the OP145 big end V-direction compensation - the connecting rod mechanism big end V-direction compensation;

[0099] The net big end H-direction eccentricity = the blank big end H-direction eccentricity - the squirrel cage big end H-direction compensation - the OP145 big end H-direction compensation - the connecting rod mechanism big end H-direction compensation;

[0100]

[0101]

[0102] Preferably, in J4,

[0103] The net flange end V-direction eccentricity = the blank flange end V-direction eccentricity - the squirrel cage flange end V-direction compensation - the OP145 flange end V-direction compensation after the first correction in J3 - the connecting rod mechanism flange end V-direction compensation;

[0104] The net flange end H-direction eccentricity = the blank flange end H-direction eccentricity - the squirrel cage flange end H-direction compensation - the OP145 flange end H-direction compensation after the first correction in J3 - the connecting rod mechanism flange end H-direction compensation;

[0105] Net eccentricity of small end V direction = raw eccentricity of small end V direction - compensation of small end V direction of cage - first modified OP145 compensation of small end V direction in J3 - compensation of small end V direction of linkage mechanism;

[0106] Net eccentricity of small end H direction = raw eccentricity of small end H direction - compensation of small end H direction of cage - first modified OP145 compensation of small end H direction in J3 - compensation of small end H direction of linkage mechanism;

[0107]

[0108]

[0109]

[0110]

[0111] Preferably, in J8,

[0112] Adjusted OP145 compensation of flange end V direction = average of raw eccentricity of flange end V direction in J4 - average of compensation of flange end V direction of cage in J4 - average of compensation of flange end V direction of linkage mechanism in J4 - average of adjusted net eccentricity of flange end V direction,

[0113] Adjusted OP145 compensation of flange end H direction = average of raw eccentricity of flange end H direction in J4 - average of compensation of flange end H direction of cage in J4 - average of compensation of flange end H direction of linkage mechanism in J4 - average of adjusted net eccentricity of flange end H direction,

[0114] Adjusted OP145 compensation of small end V direction = average of raw eccentricity of small end V direction in J4 - average of compensation of small end V direction of cage in J4 - average of compensation of small end V direction of linkage mechanism in J4 - average of adjusted net eccentricity of small end V direction,

[0115] Adjusted OP145 compensation of small end H direction = average of raw eccentricity of small end H direction in J4 - average of compensation of small end H direction of cage in J4 - average of compensation of small end H direction of linkage mechanism in J4 - average of adjusted net eccentricity of small end H direction.

[0116] Preferably, in J8,

[0117] Net eccentricity of flange end V direction = raw eccentricity of flange end V direction in J4 - compensation of flange end V direction of cage in J4 - adjusted OP145 compensation of flange end V direction in J4 - compensation of flange end V direction of linkage mechanism in J4;

[0118] Net eccentricity in the H direction of flange end = Eccentricity in the H direction of blank flange end in J4 - Compensation in the H direction of squirrel cage flange end in J4 - Adjusted compensation in the H direction of OP145 flange end - Compensation in the H direction of connecting rod mechanism flange end in J4.

[0119] Net eccentricity in the V direction at the small end = Eccentricity in the V direction at the small end of the blank in J4 - Compensation in the V direction at the small end of the squirrel cage in J4 - Adjusted compensation in the V direction at the small end of OP145 - Compensation in the V direction at the small end of the linkage mechanism in J4.

[0120] Net eccentricity in the H direction at the small end = Eccentricity in the H direction at the small end of the blank in J4 - Compensation in the H direction at the small end of the squirrel cage in J4 - Adjusted compensation in the H direction at the small end of OP145 - Compensation in the H direction at the small end of the linkage mechanism in J4.

[0121]

[0122]

[0123] Preferably, in step J10, the five new crankshafts are measured again in step OP10 and the eccentricity parameter output results are recorded to prepare for possible subsequent budget adjustments.

[0124] Preferably, in step J11, the new five crankshafts are processed to step OP145, and the new compensation value and correction value of the eccentricity of the new five crankshafts before weight removal are evaluated to prepare for possible subsequent budget adjustments.

[0125] Preferably, after processing the above 5 new crankshafts in the OP145 process, check whether the dynamic balance is qualified. If it is qualified, proceed to step J13 for normal production. If it is not qualified, return to step J3 and start a new budget cycle until the dynamic balance of 5 consecutive OP145 pieces is qualified.

[0126] The following is combined Figure 2 To further explain the present invention, the specific steps of the present invention include:

[0127] When step J0, OP145 triggers an alarm indicating a dynamic balance error greater than 20g.cm, this adjustment process begins.

[0128] J1 step, in OP10 measure 5 crankshaft and record the relevant eccentricity parameter output results, the results input calculation table 1, wherein the blank flange end V direction eccentricity is the equipment measurement blank flange eccentricity (column C), mouse cage flange end V direction compensation is the fixture eccentricity compensation of the equipment clamping crankshaft blank (column D), obtained by restarting the equipment after each downtime, OP145 flange end V direction compensation is the compensation value after the correction value measured from the previous batch OP145 before removing and input (column E), OP145 flange end V direction correction value is the compensation value correction value measured from the new batch of parts in OP145 before removing and needs to be input to OP10 (column F), connecting rod mechanism flange end V direction compensation is the connecting rod compensation value when the equipment simulates the crankshaft in the engine running (column G), which is a constant value given by the machine tool designer according to the structure of the crankshaft product. Flange end V direction net eccentricity is the blank flange end V direction eccentricity - mouse cage flange end V direction compensation - OP145 flange end V direction compensation - connecting rod mechanism flange end V direction compensation, the flange end V direction net eccentricity H column value in this table is C column - D column - E column - G column.

[0129] Table 1: OP10 flange end eccentricity parameter calculation table

[0130]

[0131] J1 step, in addition to the V direction data, there is also H direction eccentricity parameter, record and processing method is exactly the same as V direction, the subsequent steps involving H direction parameters are the same, not described.

[0132] J1 step, the total eccentricity of each crankshaft OP10 flange end is equal to the square root of the sum of the square of the V direction net eccentricity and the square of the H direction net eccentricity, which is column O in this table.

[0133] J1 step, further can be obtained the average value of all eccentricity parameters measured by OP10 for the 5 crankshafts, see table 10th row data.

[0134] J2 step, process the 5 crankshafts to OP145 process, obtain the compensation value correction value of the 5 crankshafts before removing, in this example, the V direction is -0.220, and the H direction is 0.109

[0135] J3 step, the compensation value correction value of the flange end V and H direction obtained by OP145 is substituted into the calculation table, and the compensation value updating calculation is carried out, the first corrected V direction compensation value is equal to the previous OP145 flange end compensation value + the compensation value correction value obtained by OP145 this time, which is 1.007 + (-0.220) = 0.787 in this example, and the H direction compensation value is equal to the previous OP145 flange end compensation value + the compensation value correction value obtained by OP145 this time, which is 0.750 + 0.109 = 0.859.

[0136] J4 Step, put the new compensation values of V and H direction after the first correction into the corresponding cells of the budget table of the 5 crankshafts, E14-E18, K14-K18 respectively, and get the total eccentricity of the 5 crankshafts after the first correction by the above method, O14-O18 respectively.

[0137] J4 Step, take the average of all the parameters of the 5 blanks after the first correction, see row 19.

[0138] J4 Step, if the total eccentricity of the 5 blanks after the first correction (O14-O18) is less than or equal to 0.5, directly enter J9 Step, put the compensation values of V and H direction returned by OP145 (in this example, -0.220 and 0.109 respectively) into OP10 directly. If there is more than or equal to 1 piece of total eccentricity greater than 0.5 among the 5 pieces, enter J5 Step.

[0139] J5 Step, input the eccentricity process requirement value 0.80 in cell O20 of the EXCEL calculation table, see Table 2.

[0140] J5 Step, input the eccentricity budget starting value 0.5 in cell O21 of the calculation table (equal to 67% of the process requirement value 0.8, i.e. the confidence zone of the process requirement value).

[0141] J5 Step, determine whether the maximum value of the total eccentricity of the 5 crankshafts after the first correction is greater than the eccentricity process requirement value 0.8, if yes, enter J6, otherwise enter J7.

[0142] Table 2: OP10 Flange End Eccentricity Parameter Calculation Table (Table 1 continued)

[0143]

[0144] J6 Step, determine whether the maximum value of the total eccentricity of the 5 crankshafts after the first correction is greater than the eccentricity process requirement value 0.8, i.e. input the formula in cell O22

[0145] =IF(MAX(O14:O18)>$O$20,$O$21,"OK") in J5 Step, if greater, take the eccentricity budget value (i.e. the input value of O21, 0.5 in the first round) and enter J8 for budget calculation. If less than or equal to 0.8, take the value OK.

[0146] J7 Step, if the maximum value of the total eccentricity of the 5 crankshafts is less than or equal to the eccentricity process requirement value 0.8 and at least one is greater than 0.5, directly take 0.6 and enter J8 for budget calculation.

[0147] J8 step, multiply the first round of eccentricity budget value with the average value of the V and H direction net eccentricity of the five crankshafts after the first theoretical calculation correction, and then divide by the average total eccentricity of the five crankshafts after the first theoretical calculation correction, to obtain the reverse calculated flange end V and H direction net eccentricity respectively:

[0148] If J6 condition, cell H24 input

[0149] =IF($O$22="OK","$H$19",$O$22*$H$19 / $O$19), cell N24 input

[0150] =IF($O$22="OK","$N$19",$O$22*$N$19 / $O$19), the example of J6 condition in the EXCEL table, H24=0.499, N24=-0.039 is obtained. If the maximum total eccentricity of the blank after the first theoretical calculation correction is less than or equal to the eccentricity process requirement value 0.8 (O22 is OK), the average value of the V and H direction net eccentricity of the five crankshafts after the first theoretical calculation correction (the values of cells H19 and N19 respectively) is directly taken;

[0151] If J7 condition, cell H24 input = $O$23*$H$19 / $O$19), cell N24 input = $O$23*$N$19 / $O$19).

[0152] J8 step, after the reverse calculation of the V and H direction net eccentricity of the five blanks flange end, the V direction OP145 flange end compensation value of the five blanks is further obtained, which is equal to the average value of the V direction eccentricity of the five blanks flange end - the V direction compensation value of the squirrel cage flange end - the V direction compensation value of the connecting rod mechanism flange end - the V direction net eccentricity of the flange end, that is, C24-D24-G24-H24, E24=0.934 is obtained.

[0153] J8 step, similarly, the H direction OP145 flange end compensation value of the five blanks is obtained, that is, I24-J24-M24-N24, in this example, cell K24=0.848.

[0154] J8 step, the V and H direction flange end eccentricity of the five blanks, the squirrel cage flange end compensation value, the connecting rod mechanism flange end compensation value are taken from the previous data, the OP145 flange end compensation value is uniformly taken from the compensation value obtained in the previous step, and the V and H direction net eccentricity of the five blanks is calculated respectively according to the above J1 method (i.e. C column-D column-E column-G column and I column-J column-K column-M column). Further, the total eccentricity of the five blanks is calculated, that is, cells O25-29.

[0155] J8 step, determine whether the first round of budget value calculation of the total eccentricity of 5 pieces of blank meets the process requirement value: if J6 condition, input the calculation formula in cell O30 = IF (MAX (O25:O29) ≤ $O$20, "OK", "NOK, gradually reduce the budget value and budget again"), that is, after the first round of budget value calculation, if the maximum value of the total eccentricity of 5 pieces of blank is less than or equal to the process requirement value 0.8, it is OK, and the J9 step is entered, if it is still greater than 0.8, the second round of budget is entered, and the eccentricity budget value (cell O21 data) is updated, that is, the new round of calculation is carried out by gradually reducing 0.02 on the basis of 0.5, and the above method is sequentially cycled until the maximum value of the total eccentricity of 5 pieces of blank is less than or equal to the process requirement value 0.8.

[0156] J8 step, determine whether the total eccentricity of the blank after the reverse adjustment parameter meets the process requirement value: if J7 condition, the maximum value of the total eccentricity of the 5 pieces of blank itself under this condition is less than or equal to the process requirement value 0.8, and after a round of budget calculation with 0.6 plus strict, the requirement can be met, and a new round of budget calculation is not necessary.

[0157] J9 step, determine the final compensation value correction value of OP145 flange end V direction and H direction, which are the latest budgeted V direction and H direction eccentricity compensation values (cells E31 and K31) obtained by the above method, minus the actual eccentricity compensation values (cells E32 and K32) of the current V direction and H direction of the device. The V direction and H direction eccentricity compensation value correction values obtained are input into OP10 device.

[0158] J10 step, measure new 5 pieces of crankshaft in OP10 and record eccentricity parameter output results, for subsequent possible budget adjustment.

[0159] J11 step, process the new 5 pieces of crankshaft to OP145, evaluate the new compensation value correction value of the eccentricity of the 5 pieces of crankshaft before weight reduction, for subsequent possible budget adjustment.

[0160] 12 step, after OP145 processes the above new 5 pieces of crankshaft, see if the dynamic balance is qualified, if qualified, enter J13 step for normal production, if NOK, return to J3 step to perform new budget cycle until OP145 continuously 5 pieces of dynamic balance are qualified.

[0161] Similarly, the other end of the crankshaft, i.e. the small end, also follows the same working mode as the flange end for dynamic balance budget adjustment.

[0162] Supplementary note 1: The change of total eccentricity of OP10 should not be too large, usually 67% of 0.8 tolerance, i.e. 0.5, is taken as the start, and the budget is reduced by 0.02 per round, and the maximum reduction is 0.36, otherwise it may cause OP145 to be difficult to remove the weight. Therefore, in this process, OP10 and OP145 should be balanced, and under the condition that the total eccentricity of OP10 is qualified, OP145 is balanced to remove the weight.

[0163] Supplementary note 2: Usually, if the consistency of the blank size is stable, the dynamic balance adjustment is not required after the adjustment of the equipment without failure. However, the dynamic balance adjustment is required in the case of development of new blank, change of blank mold, overhaul of the equipment or other abnormal conditions.

[0164] Those skilled in the art can understand that the above is only a preferred embodiment of the present application, and does not limit the present application. Any modification, combination, replacement, improvement, etc. made within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. A method for three-cylinder crankshaft dynamic balance adjustment, comprising OP10 process, measuring the mass center of the crankshaft, and then machining the mass center holes of the flange end and the small head end of the crankshaft on the mass center of the crankshaft through a drilling machine; OP145 process, measuring the unbalance of the crankshaft at the measuring station, and then drilling holes to remove weight at the machining station, and the product requirement of the dynamic balance of the crankshaft after weight removal is less than or equal to 20 g·cm; characterized in that: when the dynamic balance requirement of the crankshaft after weight removal is greater than 20 g·cm, the following steps are entered: J1, measuring 5 crankshafts at the OP10 process to obtain the blank flange end V-direction eccentricity, blank flange end H-direction eccentricity, blank small head end V-direction eccentricity, and blank small head end H-direction eccentricity of the 5 crankshafts; calculating the flange end V-direction net eccentricity based on the blank flange end V-direction eccentricity, the squirrel cage flange end V-direction compensation, the OP145 flange end V-direction compensation, and the connecting rod mechanism flange end V-direction compensation, calculating the flange end H-direction net eccentricity based on the blank flange end H-direction eccentricity, the squirrel cage flange end H-direction compensation, the OP145 flange end H-direction compensation, and the connecting rod mechanism flange end H-direction compensation, and calculating the total eccentricity of the flange end based on the flange end V-direction net eccentricity and the flange end H-direction net eccentricity; calculating the small head end V-direction net eccentricity based on the blank small head end V-direction eccentricity, the squirrel cage small head end V-direction compensation, the OP145 small head end V-direction compensation, and the connecting rod mechanism small head end V-direction compensation, calculating the small head end H-direction net eccentricity based on the blank small head end H-direction eccentricity, the squirrel cage small head end H-direction compensation, the OP145 small head end H-direction compensation, and the connecting rod mechanism small head end H-direction compensation, and calculating the total eccentricity of the small head end based on the small head end V-direction net eccentricity and the small head end H-direction net eccentricity; J2, machining the 5 crankshafts to the OP145 process to measure and obtain the flange end V-direction correction value, the flange end H-direction correction value, the small head end V-direction correction value, and the small head end H-direction correction value of the 5 crankshafts before weight removal; J3, the first corrected OP145 flange end V-direction compensation = the OP145 flange end V-direction compensation in J1 + the flange end V-direction correction value; the first corrected OP145 flange end H-direction compensation = the OP145 flange end H-direction compensation in J1 + the flange end H-direction correction value; the first corrected OP145 small head end V-direction compensation = the OP145 small head end V-direction compensation in J1 + the small head end V-direction correction value; and the first corrected small head end H-direction compensation in J1 = the small head end H-direction compensation in J1 in J1 + the small head end H-direction correction value. J4, based on the blank flange end V direction eccentricity, the mouse cage flange end V direction compensation, the first correction in J3 after the OP145 flange end V direction compensation, the connecting rod mechanism flange end V direction compensation, the flange end V direction net eccentricity is calculated, based on the blank flange end H direction eccentricity, the mouse cage flange end H direction compensation, the first correction in J3 after the OP145 flange end H direction compensation, the connecting rod mechanism flange end H direction compensation, the flange end H direction net eccentricity is calculated, based on the flange end V direction net eccentricity and the flange end H direction net eccentricity, the flange end total eccentricity is calculated; Based on the blank small end V direction eccentricity, the mouse cage small end V direction compensation, the first correction in J3 after the OP145 small end V direction compensation, the connecting rod mechanism small end V direction compensation, the small end V direction net eccentricity is calculated, based on the blank small end H direction eccentricity, the mouse cage small end H direction compensation, the first correction in J3 after the OP145 small end H direction compensation, the connecting rod mechanism small end H direction compensation, the small end H direction net eccentricity is calculated, based on the small end V direction net eccentricity and the small end H direction net eccentricity, the small end total eccentricity is calculated; Based on the above parameters, the average value of the blank flange end V direction eccentricity of the five crankshafts, the average value of the mouse cage flange end V direction compensation, the average value of the OP145 flange end V direction compensation, the average value of the connecting rod mechanism flange end V direction compensation, the average value of the flange end V direction net eccentricity, the average value of the blank flange end H direction eccentricity, the average value of the mouse cage flange end H direction compensation, the average value of the OP145 flange end H direction compensation, the average value of the connecting rod mechanism flange end H direction compensation, the average value of the flange end H direction net eccentricity, the average value of the blank small end V direction eccentricity, the average value of the mouse cage small end V direction compensation, the average value of the OP145 small end V direction compensation, the average value of the connecting rod mechanism small end V direction compensation, the average value of the small end V direction net eccentricity, the average value of the blank small end H direction eccentricity, the average value of the mouse cage small end H direction compensation, the average value of the OP145 small end H direction compensation, the average value of the connecting rod mechanism small end H direction compensation, the average value of the small end H direction net eccentricity, the average value of the flange end total eccentricity, the average value of the small end total eccentricity are calculated; J5, when all the flange end total eccentricity of the five crankshafts in J4 is ≤0.5mm and all the small end total eccentricity is ≤0.5mm, no budget adjustment is made, and J9 is entered; J6, when the flange end total eccentricity or the small end total eccentricity of at least one of the five crankshafts is >0.5mm and the maximum value of the flange end total eccentricity or the small end total eccentricity of the five crankshafts is >0.8mm, the flange end total eccentricity or the small end total eccentricity is assigned a value k, 0.36≤k≤0.5, the flange end correction coefficient=k / average value of the flange end total eccentricity in J4, the small end correction coefficient=k / average value of the small end total eccentricity in J4, and J8 is entered; J7, when the total eccentricity of the flange end or the total eccentricity of the small end of at least one of the five crankshafts is greater than 0.5 mm and the maximum value of the total eccentricity of the flange end or the total eccentricity of the small end of the five crankshafts is less than or equal to 0.8 mm, the total eccentricity of the flange end or the total eccentricity of the small end is assigned a value k, k = 0.6, the flange end correction factor = k / the average value of the total eccentricity of the flange end in J4, the small end correction factor = k / the average value of the total eccentricity of the small end in J4, and J8 is entered; J8, the average value of the adjusted net eccentricity of the flange end in the V direction = the average value of the net eccentricity of the flange end in the V direction in J4 * the flange end correction factor in J5, the average value of the adjusted net eccentricity of the flange end in the H direction = the average value of the net eccentricity of the flange end in the H direction in J4 * the flange end correction factor in J5, the average value of the adjusted net eccentricity of the small end in the V direction = the average value of the net eccentricity of the small end in the V direction in J4 * the small end correction factor in J5, and the average value of the adjusted net eccentricity of the small end in the H direction = the average value of the net eccentricity of the small end in the H direction in J4 * the small end correction factor in J5; The adjusted OP145 flange end V direction compensation is obtained by the average value of the blank flange end V direction eccentricity in J4, the average value of the squirrel cage flange end V direction compensation in J4, the average value of the connecting rod mechanism flange end V direction compensation in J4, and the average value of the adjusted net eccentricity of the flange end in the V direction, the adjusted OP145 flange end H direction compensation is obtained by the average value of the blank flange end H direction eccentricity in J4, the average value of the squirrel cage flange end H direction compensation in J4, the average value of the connecting rod mechanism flange end H direction compensation in J4, and the average value of the adjusted net eccentricity of the flange end in the H direction, the adjusted OP145 small end V direction compensation is obtained by the average value of the blank small end V direction eccentricity in J4, the average value of the squirrel cage small end V direction compensation in J4, the average value of the connecting rod mechanism small end V direction compensation in J4, and the average value of the adjusted net eccentricity of the flange end in the V direction, and the adjusted OP145 small end H direction compensation is obtained by the average value of the blank small end H direction eccentricity in J4, the average value of the squirrel cage small end H direction compensation in J4, the average value of the connecting rod mechanism small end H direction compensation in J4, and the average value of the adjusted net eccentricity of the small end in the H direction; For each crankshaft, the flange end V direction net eccentricity is calculated based on the blank flange end V direction eccentricity in J4, the squirrel cage flange end V direction compensation in J4, the adjusted OP145 flange end V direction compensation, and the connecting rod mechanism flange end V direction compensation in J4, the flange end H direction net eccentricity is calculated based on the blank flange end H direction eccentricity in J4, the squirrel cage flange end H direction compensation in J4, the adjusted OP145 flange end H direction compensation, and the connecting rod mechanism flange end H direction compensation in J4, and the total eccentricity of the flange end is obtained based on the flange end V direction net eccentricity and the flange end H direction net eccentricity. The net eccentricity of the small end in the V direction is calculated based on the eccentricity of the blank in the V direction at the small end in J4, the compensation of the squirrel cage in the V direction at the small end in J4, the adjusted compensation of OP145 in the V direction at the small end, and the compensation of the connecting rod mechanism in the V direction at the small end in J4; the net eccentricity of the small end in the H direction is calculated based on the eccentricity of the blank in the H direction at the small end in J4, the compensation of the squirrel cage in the H direction at the small end in J4, the adjusted compensation of OP145 in the H direction at the small end, and the compensation of the connecting rod mechanism in the H direction at the small end in J4; and the total eccentricity of the small end is calculated based on the net eccentricity of the small end in the V direction and the net eccentricity of the small end in the H direction. J9, the final correction parameter is input into OP10; if the total eccentricity of the flange end corresponding to each crankshaft in J8 is less than or equal to 0.8 mm and the total eccentricity of the small end is less than or equal to 0.8 mm, then the eccentricity of the blank after the reverse adjustment of the parameters meets the process requirement value, and the final correction parameter is determined as OP145 flange end V direction compensation correction value = adjusted OP145 flange end V direction compensation in J8 - OP145 flange end V direction compensation in J1, OP145 flange end H direction compensation correction value = adjusted OP145 flange end H direction compensation in J8 - OP145 flange end H direction compensation in J1, OP145 small end V direction compensation correction value = adjusted OP145 small end V direction compensation in J8 - OP145 small end V direction compensation in J1, and OP145 small end H direction compensation correction value = adjusted OP145 small end H direction compensation in J8 - OP145 small end H direction compensation in J1; if the total eccentricity of the flange end corresponding to five crankshafts in J4 is less than or equal to 0.5 mm, the total eccentricity of the small end is less than or equal to 0.5 mm, the final correction parameter is determined as OP145 flange end V direction compensation correction value = flange end V direction correction value in J2, OP145 flange end H direction compensation correction value = flange end H direction correction value in J2, OP145 small end V direction compensation correction value = small end V direction correction value in J2, and OP145 small end H direction compensation correction value = small end H direction correction value in J2.

2. The method of three-cylinder crankshaft dynamic balance adjustment according to claim 1, characterized in that: In J6, when the total eccentricity of the flange end or the total eccentricity of the small end of at least one of the five crankshafts is greater than 0.5 mm, and the maximum value of the total eccentricity of the flange end or the maximum value of the total eccentricity of the small end of the five crankshafts is greater than 0.8 mm, then the first assignment is k = 0.5, and the value of the total eccentricity of the flange end or the total eccentricity of the small end is assigned as 0.5 - 0.02 * cycle number in each cycle.

3. The method of three cylinder crankshaft dynamic balance adjustment of claim 1, wherein: In J7, when the total eccentricity of the flange end or the total eccentricity of the small end of at least one of the five crankshafts is greater than 0.5 mm, and the maximum value of the total eccentricity of the flange end or the maximum value of the total eccentricity of the small end of the five crankshafts is less than or equal to 0.8 mm, then k is directly assigned as 0.

6.

4. The method of three cylinder crankshaft dynamic balance adjustment of claim 1, wherein: In J1, The net eccentricity of the flange end in the V direction = the eccentricity of the blank in the V direction at the flange end - the compensation of the squirrel cage in the V direction at the flange end - the compensation of OP145 in the V direction at the flange end - the compensation of the connecting rod mechanism in the V direction at the flange end. Net eccentricity of flange end in H direction = eccentricity of blank flange end in H direction - compensation of cage flange end in H direction - compensation of OP145 flange end in H direction - compensation of connecting rod mechanism flange end in H direction; Net eccentricity of small end in V direction = eccentricity of blank small end in V direction - compensation of cage small end in V direction - compensation of OP145 small end in V direction - compensation of connecting rod mechanism small end in V direction; Net eccentricity of small end in H direction = eccentricity of blank small end in H direction - compensation of cage small end in H direction - compensation of OP145 small end in H direction - compensation of connecting rod mechanism small end in H direction; 5. The method of three cylinder crankshaft dynamic balance adjustment of claim 1, wherein: In J4, Net eccentricity of flange end in V direction = eccentricity of blank flange end in V direction - compensation of cage flange end in V direction - compensation of OP145 flange end in V direction after first correction in J3 - compensation of connecting rod mechanism flange end in V direction; Net eccentricity of flange end in H direction = eccentricity of blank flange end in H direction - compensation of cage flange end in H direction - compensation of OP145 flange end in H direction after first correction in J3 - compensation of connecting rod mechanism flange end in H direction; Net eccentricity of small end in V direction = eccentricity of blank small end in V direction - compensation of cage small end in V direction - compensation of OP145 small end in V direction after first correction in J3 - compensation of connecting rod mechanism small end in V direction; Net eccentricity of small end in H direction = eccentricity of blank small end in H direction - compensation of cage small end in H direction - compensation of OP145 small end in H direction after first correction in J3 - compensation of connecting rod mechanism small end in H direction; 6. The method of three cylinder crankshaft dynamic balance adjustment of claim 1, wherein: In J8, Compensation of OP145 flange end in V direction after adjustment = average of eccentricity of blank flange end in V direction in J4 - average of compensation of cage flange end in V direction in J4 - average of compensation of connecting rod mechanism flange end in V direction in J4 - average of net eccentricity of flange end in V direction after adjustment, Compensation of OP145 flange end in H direction after adjustment = average of eccentricity of blank flange end in H direction in J4 - average of compensation of cage flange end in H direction in J4 - average of compensation of connecting rod mechanism flange end in H direction in J4 - average of net eccentricity of flange end in H direction after adjustment, Compensation of OP145 small end in V direction after adjustment = average of eccentricity of blank small end in V direction in J4 - average of compensation of cage small end in V direction in J4 - average of compensation of connecting rod mechanism small end in V direction in J4 - average of net eccentricity of small end in V direction after adjustment, Compensation of OP145 small end in H direction after adjustment = average of eccentricity of blank small end in H direction in J4 - average of compensation of cage small end in H direction in J4 - average of compensation of connecting rod mechanism small end in H direction in J4 - average of net eccentricity of small end in H direction after adjustment.

7. The method of three cylinder crankshaft dynamic balance adjustment of claim 1, wherein: In J8, Net eccentricity of flange end in V direction = eccentricity of blank flange end in V direction in J4 - compensation of cage flange end in V direction in J4 - compensation of OP145 flange end in V direction after adjustment - compensation of connecting rod mechanism flange end in V direction in J4; Net eccentricity of flange end H direction in J4 = eccentricity of flange end H direction in J4 blank - compensation of flange end H direction in J4 squirrel cage - compensation of flange end H direction in OP145 after adjustment - compensation of flange end H direction in J4 connecting rod mechanism; Net eccentricity of small end V direction in J4 = eccentricity of small end V direction in J4 blank - compensation of small end V direction in J4 squirrel cage - compensation of small end V direction in OP145 after adjustment - compensation of small end V direction in J4 connecting rod mechanism; Net eccentricity of small end H direction in J4 = eccentricity of small end H direction in J4 blank - compensation of small end H direction in J4 squirrel cage - compensation of small end H direction in OP145 after adjustment - compensation of small end H direction in J4 connecting rod mechanism; 8. The method of three cylinder crankshaft dynamic balance adjustment of claim 1, wherein: J10, measure new 5 crankshafts in OP10 process again and record eccentricity parameter output results, prepare for possible budget adjustment in the future.

9. The method of three-cylinder crankshaft dynamic balance adjustment according to claim 8, characterized in that: J11, process the new 5 crankshafts to OP145 process, evaluate to obtain new compensation value correction value of eccentricity of the new 5 crankshafts before weight reduction, prepare for possible budget adjustment in the future.

10. The method of three-cylinder crankshaft dynamic balance adjustment of claim 9, wherein: After processing the above new 5 crankshafts in OP145 process, see if the dynamic balance is qualified, if qualified, enter J13 step for normal production, if not qualified, return to J3 step, re-perform new budget cycle until OP145 dynamic balance of 5 consecutive crankshafts is qualified.

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