Triangular indexable blade clamping phase error measurement method

Abstract

The invention relates to a triangular indexable blade clamping phase error measuring method, and belongs to the technical field of machine tool blade machining. According to the method, a triangular indexable blade blank is clamped on a workpiece clamp of a peripheral edge grinding numerical control machine tool, and according to the machined triangular indexable blade blank and actual geometric characteristics of the machined triangular indexable blade blank on the machine tool, the included angle of the center lines of a triangle A0B0C0 clamped without eccentric errors and a triangle ABC actually clamped is obtained, namely the phase error. The method is input into a machine tool, and phase errors generated by blade clamping can be measured and eliminated. The method has the characteristics of high efficiency, high accuracy, wide applicability and the like.

Description

Technical Field

[0001] The invention relates to a method for measuring a clamping phase error of a triangular indexable insert and belongs to the technical field of machine tool insert processing. Background Art

[0002] In the grinding production of indexable inserts, polygonal indexable insert blanks are usually clamped and loaded with auxiliary tooling to control the phase error of the longitudinal axis. In the actual clamping of the tool and the part, the geometric center of the tool will not coincide with the phase origin of the machine tool spindle, resulting in a phase error, which causes the part to be processed incompletely and the size to be incorrect. However, the eccentricity of the tool cannot be directly measured by the tool, and the position of the auxiliary tooling bracket can only be repeatedly tested during processing to reduce the phase error of the blade. This method results in low processing efficiency, and it takes a long time to reversely calculate the phase error of the tool based on the part size deviation. Especially in the process of small-batch flexible production, that is, the production of multiple types of small-batch blades, it is often necessary to frequently replace and adjust the blade bracket to ensure the phase error of the blade, and it is time-consuming and laborious to use the bracket for phase adjustment of some special-shaped blades with holes. There are problems such as low efficiency and unreliable adjustment. In order to ensure the accuracy of the finished product, the measurement of the blade phase error is imminent. Summary of the invention

[0003] The technical problem to be solved by the present invention is to solve the shortcomings of the prior art and propose a method for measuring the phase error of a triangular indexable insert clamping. The method is characterized in that: a triangular indexable insert blank is clamped on a peripheral grinding CNC machine tool workpiece fixture, and a triangular A0B0C clamping without eccentricity error is obtained according to the processed triangular indexable insert blank and its actual geometric characteristics on the machine tool. 0、 The actual clamped triangle ABC center line angle is the phase error , ensuring the accuracy of the finished product.

[0004] In order to solve the above technical problems, the present invention proposes a method for measuring the phase error of a triangular indexable insert clamping. The triangular indexable insert blank is clamped on a peripheral grinding CNC machine tool workpiece fixture. According to the processed triangular indexable insert blank and its actual geometric characteristics on the machine tool, the triangular A0B0C clamped without eccentricity error is obtained. 0、 The actual clamped triangle ABC center line angle is the phase error ; The specific measurement method steps include:

[0005] 1.1 Determine the distance d from the sensor to the center of rotation of the machine tool B axis, and measure the diameter of the inscribed circle of the blank .

[0006] 1.2 The sensor measures and records the distance to A0C0. 、A1C1 distance is .

[0007] 1.3 Let the angle between the origin O and the line perpendicular to the side AB and the X-axis be α degrees, and rotate the B axis clockwise by 5-8 degrees.

[0008] 1.4 Calculate the initial phase α of the insert clamping;

[0009] The distance from each side to the center of rotation of the machine tool B axis is: ,

[0010] From the geometric relationship, we can get ,in is half the height of the sensor probe, The angle of B axis rotation clockwise.

[0011] This equation has no analytical solution so the bisection interval method is used to calculate its numerical solution;

[0012] (1) Establish the equation .

[0013] (2) Under ideal error-free conditions Angle, for triangular blades, is 30°, from the error within ±0~10°, 30°±10° and considering the error margin of 5°, we can get exist There is a real root.

[0014] (3) Assume the tolerance is 1*10-4.

[0015] (4) Iterative solution: Let

[0016] Continuous Function exist There is only one real root and it satisfies ;

[0017] a. Remember , take the midpoint of the interval ;

[0018] b. Discrimination If the value of , then the output , stop; if ,remember , otherwise remember ;

[0019] c. Remember , then take ;

[0020] d. If , then the output , stop; otherwise replace Go to step (1).

[0021] 1.5 Calculate the blade clamping phase error based on the above , .

[0022] By inputting this method into the machine tool, the phase error caused by the clamping blade can be measured and eliminated. This improves the machining accuracy of the blade. After experimental measurement, the experimental results show that after using this method to eliminate the phase error, the deviation is within ±4 This method has the characteristics of high efficiency, high accuracy and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of each axis of the four-axis CNC peripheral grinding machine of the present invention.

[0024] Figure 2 It is a schematic diagram of the structure of the blade clamping body of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the ideal eccentricity error-free state and actual clamping of the triangular rotatable blade of the present invention.

[0026] Figure 4 It is a schematic diagram of the phase error measurement of the triangular indexable insert of the present invention.

[0027] Figure 5 It is a schematic diagram of phase error measurement of the triangular indexable insert of the present invention. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are further described in detail below. The technologies or products not specified in the examples are all existing technologies or conventional products that can be purchased.

[0029] Example 1: Figure 5 As shown in the figure, the method for measuring the phase error of the triangular indexable insert clamping requires a square measuring probe. The probe size of this example is 40x25mm, half of the height is recorded. The triangular indexable insert blank is clamped on the peripheral grinding CNC machine tool workpiece fixture, and the triangular A0B0C clamped without eccentric error is obtained according to the processed triangular indexable insert blank and its actual geometric characteristics on the machine tool. 0、 The actual clamped triangle ABC center line angle is the phase error ; The specific measurement method steps include:

[0030] 1.1 Determine the distance from the sensor to the center of rotation of the machine tool B axis , and measure the diameter of the inscribed circle of the blank .

[0031] 1.2 The sensor measures and records the distance to A0C0. 、A1C1 distance is .

[0032] 1.3 Let the angle between the line from the origin O to the side AB and the X-axis be α degrees, and rotate the B axis 8 degrees clockwise.

[0033] 1.4 Calculate the initial phase α of the insert clamping;

[0034] The distance from each side to the center of rotation of the machine tool B axis is: ,

[0035] From the geometric relationship, we can get ,

[0036] This equation has no analytical solution so the bisection interval method is used to calculate its numerical solution;

[0037] (5) Establish equation .

[0038] (6) Under ideal error-free conditions Angle, for triangular blades, is 30°, from the error within ±0~10°, 30°±10° and considering the error margin of 5°, we can get exist There is a real root.

[0039] (7) Assume the tolerance is 1*10-4.

[0040] (8) Iterative solution: Let

[0041] Continuous Function exist There is only one real root and it satisfies ;

[0042] a. Remember , take the midpoint of the interval ;

[0043] b. Discrimination If the value of , then the output , stop; if ,remember , otherwise remember:

[0044] ;

[0045] c. Remember , then take ;

[0046] d. If , then the output , stop; otherwise replace Go to step (1).

[0047] Calculated , bring in We can get:

[0048]

[0049] , the calculation result is established.

[0050] 1.5 Calculate the blade clamping phase error based on the above , , the measurement and calculation error is 0.0327°=1.962 .

[0051] The technical contents of the present invention are explained above, but the protection scope of the present invention is not limited to the said contents. Within the knowledge scope of ordinary technicians in this field, various changes can be made to the technical contents of the present invention without departing from the purpose of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for measuring the phase error of a triangular indexable insert during clamping, characterized in that: The triangular indexable insert blank is clamped on the peripheral grinding CNC machine tool workpiece fixture. According to the processed triangular indexable insert blank and its actual geometric characteristics on the machine tool, the triangular A0B0C clamped without eccentric error is obtained. 0、 The actual clamped triangle ABC center line angle is the phase error ; The specific measurement method steps include: 1.1 Determine the distance d from the sensor to the center of rotation of the machine tool B axis, and measure the diameter of the inscribed circle of the blank ; 1.2 The sensor measures and records the distance to A0C0. 、A1C1 distance is ; 1.3 Let the angle between the origin O and the line perpendicular to the side AB and the X-axis be α degrees. Rotate the B axis clockwise. Spend; 1.4 Calculate the initial phase α of the blade clamping; 1.5 Calculate the blade clamping phase error based on the above , .

2. The method for measuring the phase error of a triangular indexable insert according to claim 1, characterized in that: The clockwise rotation angle of the B axis is 5-8 degrees.

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