Calculation method of curved surface milling correction value

Abstract

The invention discloses a curved surface milling correction value calculation method, which comprises the following steps of: establishing a three-dimensional model of a measured rotor and a milling cutter cutting section, measuring the milling section area S of the measured rotor and the arc volume sum of feeding and discharging of a milling cutter according to the three-dimensional model, and obtaining bilateral arcs of the total mass M milled during feeding and discharging of the milling cutter according to the arc volume sum; step 2, measuring an unbalance amount m through a dynamic balancing machine, and calculating a milling angle alpha according to the unbalance amount m; 3, calculating the mass M [beta] of the correction value removed from the milling angle [alpha] according to the following formula; the milling angle is calculated by using a formula according to the unbalance amount measured on site for de-weighting processing, so that the calculation result is more accurate, the one-time de-weighting qualification rate is high, and the problems of long production period and low processing efficiency are solved; and meanwhile, the milling angle and the milling quality calculation result can be in one-to-one correspondence, so that the problems that the de-weighting quality is difficult to judge, and repeated trial cutting groping and repeated measurement are required in advance are solved.

Description

Technical Field

[0001] The invention belongs to the field of machining, relates to a curved surface milling correction amount, and specifically is a method for calculating the curved surface milling correction amount. Background Art

[0002] In production, we often encounter situations where the imbalance of the measured rotor is relatively large, and the drawings require milling and de-weighting correction on the outer contour of the rotor. For such rotors, we often use milling to de-weight on the machining center. Due to the influence of factors such as the milling tool radius, milling depth, milling expansion angle, and the complexity of the peripheral surface, the amount of mass removed by milling is difficult to judge. We mark the parts according to the imbalance and de-weighting position measured by the dynamic balancing machine, and then perform trial cutting and exploratory processing on the vertical machining center. Two operators are required to cooperate in repeated measurements and trial cutting. The cycle of balancing a workpiece is very long, which occupies manpower and equipment resources, is very wasteful, and has low production efficiency. This contradiction is particularly prominent for large parts or urgently needed products. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for calculating the correction amount of surface milling to solve the technical problem in the prior art that the quality of milling de-weighting is difficult to judge.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A method for calculating a surface milling correction amount comprises the following steps:

[0006] Step 1: Establish a three-dimensional model of the rotor under test and the cutting section of the milling cutter. According to the three-dimensional model, the milling cross-sectional area S of the rotor under test and the sum of the arc volumes of the milling cutter when entering and exiting the cutter are measured. According to the sum of the arc volumes, the total mass M milled when the milling cutter enters and exits the cutter is obtained. 双侧圆弧 ;

[0007] Step 2: The unbalance m is measured by a dynamic balancing machine, and the milling angle α is calculated based on the unbalance m.

[0008]

[0009] M 2π =2ρSRπ

[0010] in:

[0011] M 2π Indicates the mass reduced by the milling cutter during one round of milling;

[0012] ρ represents the density of the rotor being measured;

[0013] S represents the milling cross-sectional area measured by the 3D software;

[0014] R represents the correction radius of the rotor being measured;

[0015] Step 3: Calculate the mass M of the correction amount removed by the milling angle α according to the following formula: β ;

[0016]

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] (I) The milling angle for de-weighting is calculated using a formula based on the imbalance measured on site. The calculation results are more accurate and the qualified rate of de-weighting is high in one go, solving the problems of long production cycle and low processing efficiency. At the same time, the milling angle and the milling quality calculation results can be matched one to one, solving the problem of difficulty in judging the de-weighting quality, which previously required multiple trial cutting and repeated measurements.

[0019] (II) If the workpiece has a large unbalance and cannot be deweighted in one go, the allowable milling angle can be input to calculate the equivalent unbalance, thereby determining in advance whether the workpiece will be scrapped due to the inability to remove the weight.

[0020] (III) By using the technology of the present invention, the problem of long-term occupation of manpower and waste of equipment resources can be solved.

[0021] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0022] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0023] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0024] The present invention provides a method for calculating a surface milling correction amount, comprising the following steps:

[0025] Step 1: Establish a three-dimensional model of the rotor under test and the cutting section of the milling cutter. According to the three-dimensional model, the milling cross-sectional area S of the rotor under test and the sum of the arc volumes of the milling cutter when entering and exiting the cutter are measured. According to the sum of the arc volumes, the total mass M milled when the milling cutter enters and exits the cutter is obtained. 双侧圆弧 ;

[0026] Step 2: The unbalance m is measured by a dynamic balancing machine, and the milling angle α is calculated based on the unbalance m.

[0027]

[0028] M 2π =2ρSRπ

[0029] in:

[0030] M 2π Indicates the mass reduced by the milling cutter during one round of milling;

[0031] ρ represents the density of the rotor being measured;

[0032] S represents the milling cross-sectional area measured by the 3D software;

[0033] R represents the correction radius of the rotor being measured;

[0034] Step 3: Calculate the mass M of the correction amount removed by the milling angle α according to the following formula: β ;

[0035]

[0036] In the above technical solution, the imbalance amount measured on site is used to calculate the milling angle for de-weighting processing using a formula. The calculation result is more accurate and the qualified rate of de-weighting is high in one time, which solves the problems of long production cycle and low processing efficiency. At the same time, the milling angle and the milling quality calculation results can correspond one to one, which solves the problem that the de-weighting quality is difficult to judge, which previously required multiple trial cutting and repeated measurements.

[0037] The working process when using is as follows:

[0038] (1) Establish a three-dimensional model of the rotor to be measured and the cutting section of the milling cutter in the three-dimensional software;

[0039] (2) The volume of the milling cutter arc is measured according to the 3D software function. Since the volume of the milling cutter is equal to the volume of the milling cutter arc, the volume of the double arc is multiplied by 2, and the M is calculated. 双圆弧 ;

[0040] (3) The milling cross-sectional area S is obtained by measuring with 3D software;

[0041] (4) The density ρ of the rotor material to be measured is determined according to national standards;

[0042] (5) Obtain the correction radius R of the rotor to be measured from the drawing of the rotor to be measured;

[0043] (6) Input each quantity into the numbered program and calculate the required milling angle α or the corresponding mass m β , so as to know the on-site production.

[0044] When the unbalance is known, the milling angle and total milling mass are calculated:

[0045]

[0046] When the milling angle is known, the unbalance and total milling mass are calculated:

[0047]

Claims

1. A method for calculating the correction amount of curved surface milling, characterized in that: The following steps are involved: Step 1: Establish a three-dimensional model of the rotor under test and the cutting section of the milling cutter. According to the three-dimensional model, the milling cross-sectional area S of the rotor under test and the sum of the arc volumes of the milling cutter when entering and exiting the cutter are measured. According to the sum of the arc volumes, the total mass M milled when the milling cutter enters and exits the cutter is obtained. 双侧圆弧 ; Step 2: The unbalance m is measured by a dynamic balancing machine, and the milling angle α is calculated based on the unbalance m. M 2π =2ρSRπ in: M 2π Indicates the mass reduced by the milling cutter during one round of milling; ρ represents the density of the rotor being measured; S represents the milling cross-sectional area measured by the 3D software; R represents the correction radius of the rotor being measured; Step 3: Calculate the mass M of the correction amount removed by the milling angle α according to the following formula: β ;

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