A method for quickly aligning the coordinate system of a fixture in a shell-type machining center

Abstract

This invention discloses a method for quickly aligning the coordinate system of a fixture in a shell-type machining center: Using the coordinates of the machining center as a reference, the coordinates of the fixture's B-axis reference point are measured, and the fixture's B-axis compensation angle is calculated using these coordinates. The fixture position is adjusted according to the B-axis compensation angle, and the coordinates of the fixture's locating pin are measured. The fixture's A-axis compensation angle is calculated using these coordinates. The fixture position is adjusted again based on the B-axis and A-axis compensation angles, and the coordinates of the fixture's support rod are measured. The coordinates of the fixture's X-axis origin are calculated using these coordinates. The fixture coordinate system is then generated using the B-axis compensation angle, A-axis compensation angle, locating pin coordinates, and X-axis origin coordinates. This invention significantly improves the alignment efficiency of the fixture coordinate system, saves debugging time, and reduces manual measurement errors.

Description

Technical Field

[0001] This invention relates to the field of machining technology for shell-type parts, specifically to a method for quickly aligning the coordinate system of a fixture in a shell-type machining center. Background Technology

[0002] Currently, after changing fixtures, machining centers for housings require recalibrating the fixture coordinate system. Traditional fixture coordinate system calibration involves using a dial indicator, fixing the indicator base to the tool spindle, marking the positioning points on the fixture, and then calculating the programming origin based on the coordinates of the positioning points.

[0003] Currently, the existing fixture alignment dialing method has the following disadvantages: 1. The manual dialing method is time-consuming; 2. It requires the commissioning personnel to enter the equipment, but the space inside the equipment is small, which makes the operation inconvenient. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a fixture coordinate system alignment method that is suitable for high-precision machining centers, easy and quick to operate, requires no calculation or manual data input, and has small errors.

[0005] To achieve this objective, the present invention provides a method for rapidly aligning the fixture coordinate system in a shell-type machining center: Using the machining center's coordinates as a reference, the coordinates of the fixture's B-axis reference point are measured, and the fixture's B-axis compensation angle is calculated using these coordinates. The fixture's position is adjusted according to the B-axis compensation angle, and the coordinates of the fixture's locating pin are measured. The fixture's A-axis compensation angle is calculated using these coordinates. The fixture's position is adjusted based on both the B-axis and A-axis compensation angles, and the coordinates of the fixture's support rod are measured. The coordinates of the fixture's X-axis origin are calculated using these coordinates. A fixture coordinate system is generated using the fixture's B-axis compensation angle, A-axis compensation angle, locating pin coordinates, and X-axis origin coordinates.

[0006] Furthermore, the method for measuring the coordinates of the fixture B-axis reference point based on the coordinates of the machining center is as follows: the fixture is rotated 90° from its initial position along the B-axis to a position perpendicular to the coordinate probe, and the coordinate probe moves along the Z-axis towards the fixture B-axis reference point until the coordinate probe contacts the fixture B-axis reference point, thereby generating the coordinates of the fixture B-axis reference point.

[0007] Furthermore, the clamp B-axis reference point includes the first clamp B-axis reference point measured by the coordinate probe after the clamp is rotated 90° from its initial position along the B-axis to a position perpendicular to the coordinate probe, and the clamp is kept in a position perpendicular to the coordinate probe. After rotating 180° along the C-axis, the second clamp B-axis reference point is measured by the coordinate probe.

[0008] Furthermore, the method for adjusting the position of the fixture according to the B-axis compensation angle and measuring the coordinates of the fixture positioning pin is as follows: the fixture is rotated 90° + the B-axis compensation angle from its initial position along the B-axis, and the coordinate probe is brought close to the fixture positioning pin until the coordinate probe contacts the fixture positioning pin, thereby generating the coordinates of the fixture positioning pin.

[0009] Furthermore, the fixture positioning pins include cylindrical positioning pins and prism positioning pins arranged vertically on the fixture.

[0010] Furthermore, the coordinate probe approaches the fixture positioning pin until it contacts the fixture positioning pin to generate the coordinates of the fixture positioning pin, including: the coordinate probe approaches the end center of the cylindrical positioning pin until it contacts the end center of the cylindrical positioning pin to generate the coordinates of the cylindrical positioning pin; and the coordinate probe approaches the end center of the prism positioning pin until it contacts the end center of the prism positioning pin to generate the coordinates of the prism positioning pin.

[0011] Furthermore, the coordinate probe approaches the center of the end of the cylindrical locating pin from multiple directions until it contacts the center of the end of the cylindrical locating pin, generating multiple coordinates of the cylindrical locating pin, and the average value of the multiple coordinates of the cylindrical locating pin is taken as the coordinate of the cylindrical locating pin; the coordinate probe approaches the center of the end of the prism locating pin from multiple directions until it contacts the center of the end of the prism locating pin, generating multiple coordinates of the prism locating pin, and the average value of the multiple coordinates of the prism locating pin is taken as the coordinate of the prism locating pin.

[0012] Furthermore, the method for adjusting the position of the fixture according to the B-axis compensation angle and the A-axis compensation angle of the fixture, and measuring the coordinates of the fixture support rod is as follows: the fixture is rotated from its initial position along the A-axis by the A-axis compensation angle, and then rotated along the B-axis by 90° + the B-axis compensation angle. The coordinate probe moves closer to the fixture support rod along the Z-axis until the coordinate probe contacts the fixture support rod, thereby generating the coordinates of the fixture support rod.

[0013] Furthermore, three or four clamp support rods are vertically arranged around the clamp; the coordinate probe approaches the three or four clamp support rods along the Z-axis until the coordinate probe contacts the three or four clamp support rods respectively, generating the coordinates of the three or four clamp support rods.

[0014] Furthermore, the method for quickly aligning the fixture coordinate system in a shell-type machining center, as described above, includes the following steps:

[0015] Step 1: Using the coordinates of the machining center as a reference, measure the coordinates of the B-axis reference point of the fixture, and calculate the B-axis compensation angle of the fixture using the coordinates of the B-axis reference point.

[0016] Step 2: Adjust the position of the fixture according to the B-axis compensation angle, measure the coordinates of the fixture positioning pin, and calculate the A-axis compensation angle of the fixture using the coordinates of the fixture positioning pin;

[0017] Step 3: Adjust the position of the fixture according to the B-axis compensation angle and the A-axis compensation angle of the fixture, measure the coordinates of the fixture support rod, and calculate the coordinates of the origin of the fixture X-axis through the coordinates of the fixture support rod;

[0018] Step 4: Generate a fixture coordinate system using the B-axis compensation angle of the fixture, the A-axis compensation angle of the fixture, the coordinates of the fixture positioning pin, and the coordinates of the origin of the X-axis of the fixture.

[0019] The beneficial effects of this invention are as follows: The method for aligning the fixture coordinate system designed in this invention uses the machine tool's rotation center as a reference. It is calculated through fixture digital model measurement. When the coordinate probe contacts the measured point, the probe sends an external interrupt request to the machine tool's CNC system. Upon receiving the interrupt signal, the CNC machining center control system latches the coordinate value of the probe's center of gravity at this moment through the positioning system. This determines the coordinate value of the contact point between the probe and the workpiece, thereby performing dimensional compensation. This invention significantly improves the alignment efficiency of the fixture coordinate system, saves debugging time, and reduces manual measurement errors. Personnel do not need to enter the equipment to complete the alignment of the fixture coordinate system, ensuring personnel safety and providing convenient and quick operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the initial positions of the clamp and the coordinate side head in this invention;

[0021] Figure 2 This is a schematic diagram illustrating the operation of the coordinate probe measuring the coordinates of the reference point of the first fixture B axis in this invention;

[0022] Figure 3 This is a schematic diagram illustrating the operation of the coordinate probe measuring the coordinates of the reference point of the B-axis of the second fixture in this invention;

[0023] Figure 4 This is a schematic diagram illustrating the operation of the coordinate probe in this invention for measuring the coordinates of a cylindrical positioning pin.

[0024] Figure 5 This is a schematic diagram illustrating the operation of the coordinate probe in this invention for measuring the coordinates of the prism positioning pin.

[0025] Figure 6 This is a schematic diagram illustrating the operation of the coordinate probe measuring the coordinates of the first clamp support rod in this invention.

[0026] Figure 7 This is a schematic diagram illustrating the operation of the coordinate probe measuring the coordinates of the second clamp support rod in this invention.

[0027] Figure 8 This is a schematic diagram illustrating the operation of the coordinate probe measuring the coordinates of the third clamp support rod in this invention.

[0028] Figure 9 This is a schematic diagram illustrating the operation of the coordinate probe measuring the coordinates of the fourth clamp support rod in this invention.

[0029] Wherein, 1—clamp, 2—clamp B-axis reference point, 3—cylindrical locating pin, 4—prism locating pin, 5—clamp support rod, 6—coordinate probe. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] This invention designs a method for quickly aligning the coordinate system of a fixture in a shell-type machining center. The fixture 1 and the coordinate probe 6 are positioned at the starting positions of the machining center as follows: Figure 1 As shown, since the fixture coordinate system cannot be directly measured manually, this invention uses the coordinates of the machining center as a reference, measures the coordinates of feature points on fixture 1 using coordinate probe 6, and obtains the fixture coordinate system by assigning and calculating these feature points through CNC macro programming. The specific steps are as follows:

[0032] Step 1: Using the coordinate system of the machining center as a reference, rotate fixture 1 90° from its initial position along the B-axis to a position perpendicular to the coordinate probe 6, as follows: Figure 2 As shown, the coordinate probe 6 approaches the reference point 2 of the fixture B-axis along the Z-axis until the coordinate probe 6 contacts the reference point 2 of the fixture B-axis, generating the coordinates of the reference point 2 of the fixture B-axis, and then the coordinate probe 6 retracts; Figure 3As shown, after rotating the fixture 180° along the C-axis, the coordinate probe 6 approaches the fixture B-axis reference point 2 again along the Z-axis to measure the coordinates of the two fixture B-axis reference points 2; input the coordinates of the fixture B-axis reference point 2 in the program $P_UIFR[1, B, TR]=AXB[B] to generate the B-axis compensation angle Angle[B].

[0033] Step 2: Rotate fixture 1 from its initial position by 90° along the B-axis, plus the fixture's B-axis compensation angle, as follows: Figure 4 As shown, the coordinate probe 6 approaches the center of the end of the cylindrical positioning pin 3 from four directions until the coordinate probe 6 contacts the center of the end of the cylindrical positioning pin 3, generating four coordinates of the cylindrical positioning pin 3. The average of the four coordinates of the cylindrical positioning pin 3 is taken as the coordinate of the cylindrical positioning pin 3; similarly, as... Figure 5 As shown, the coordinate probe 6 approaches the end center of the prism positioning pin 4 from four directions until the coordinate probe 6 contacts the end center of the prism positioning pin 4, generating the coordinates of the four prism positioning pins 4. The average value of the coordinates of the four prism positioning pins 4 is taken as the coordinate of the prism positioning pin 4. The coordinates of the cylindrical positioning pin 3 and the coordinates of the prism positioning pin 4 are input into the program $P_UIFR[1, A, TR] = AXA[A] to generate the A-axis compensation angle Angle[A].

[0034] Step 3: Fixture 1 is rotated from its initial position along axis A by a compensation angle, and then rotated 90° along axis B by a compensation angle along axis B, as follows: Figure 6 As shown in Figure 9, the coordinate probe 6 approaches the four clamp support rods 5 along the Z-axis until the coordinate probe 6 contacts the clamp support rods 5, generating the coordinates of the four clamp support rods 5; input the coordinates of the four clamp support rods 5 into the program POS_M[X]=Dec_PosX_Theo+(POS_M[X] / NptsPlan)-AXA[0] to generate the coordinates of the X-axis origin.

[0035] Step 4: Generate the fixture coordinate system using the fixture B-axis compensation angle, the fixture A-axis compensation angle, the coordinates of the cylindrical positioning pin 3 (or the coordinates of the prism positioning pin 4; the present invention prefers the coordinates of the cylindrical positioning pin 3 for ease of calculation), and the coordinates of the fixture X-axis origin.

[0036] In summary, the method for aligning the fixture coordinate system designed in this invention uses the machine tool's rotation center as a reference. It is calculated through fixture digital model measurement. When the coordinate probe 6 contacts the measured point, the probe sends an external interrupt request to the machine tool's CNC system. Upon receiving the interrupt signal, the CNC machining center control system latches the coordinate value of the probe's sphere center at that moment through the positioning system, thereby determining the coordinate value of the contact point between the probe and the workpiece, and thus performing dimensional compensation. This invention significantly improves the alignment efficiency of the fixture coordinate system, saves debugging time, and reduces manual measurement errors. Personnel can complete the alignment of the fixture coordinate system without entering the equipment, ensuring personnel safety and providing convenient and quick operation.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the structure of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for rapidly aligning the coordinate system of a fixture in a shell-type machining center, characterized in that: Using the coordinates of the machining center as a reference, the coordinates of the B-axis reference point (2) of the fixture are measured, and the B-axis compensation angle of the fixture is calculated using the coordinates of the B-axis reference point (2). Adjust the position of the fixture (1) according to the B-axis compensation angle of the fixture, measure the coordinates of the fixture positioning pin, and calculate the A-axis compensation angle of the fixture through the coordinates of the fixture positioning pin; Adjust the position of the clamp (1) according to the compensation angle of the clamp B axis and the compensation angle of the clamp A axis, measure the coordinates of the clamp support rod (5), and calculate the coordinates of the origin of the clamp X axis through the coordinates of the clamp support rod (5); A fixture coordinate system is generated by the B-axis compensation angle of the fixture, the A-axis compensation angle of the fixture, the coordinates of the fixture positioning pin, and the coordinates of the origin of the X-axis of the fixture. The method for measuring the coordinates of the B-axis reference point (2) of the fixture using the coordinates of the machining center as a reference is as follows: the fixture (1) is rotated 90° from its initial position along the B-axis to a position perpendicular to the coordinate probe (6), and the coordinate probe (6) moves along the Z-axis toward the B-axis reference point (2) of the fixture until the coordinate probe (6) contacts the B-axis reference point (2) of the fixture, thereby generating the coordinates of the B-axis reference point (2) of the fixture; The clamp B-axis reference point (2) includes the clamp (1) rotating 90° from its initial position along the B-axis to a position perpendicular to the coordinate probe (6), the first clamp B-axis reference point measured by the coordinate probe (6) and the clamp (1) remaining in a position perpendicular to the coordinate probe (6), and the second clamp B-axis reference point measured by the coordinate probe (6) after rotating 180° along the C-axis; The method for adjusting the position of the fixture (1) according to the B-axis compensation angle of the fixture and measuring the coordinates of the fixture positioning pin is as follows: the fixture (1) is rotated 90° + the B-axis compensation angle of the fixture from the initial position along the B-axis, and the coordinate probe (6) is brought close to the fixture positioning pin until the coordinate probe (6) contacts the fixture positioning pin, thereby generating the coordinates of the fixture positioning pin; The method for adjusting the position of the clamp (1) according to the clamp B-axis compensation angle and the clamp A-axis compensation angle, and measuring the coordinates of the clamp support rod (5) is as follows: the clamp (1) is rotated from its initial position along the A-axis by the clamp A-axis compensation angle and along the B-axis by 90° + the clamp B-axis compensation angle. The coordinate probe (6) moves along the Z-axis towards the clamp support rod (5) until the coordinate probe (6) contacts the clamp support rod (5), thereby generating the coordinates of the clamp support rod (5).

2. The method for rapidly aligning the coordinate system of a fixture in a shell-type machining center as described in claim 1, characterized in that: The fixture positioning pins include cylindrical positioning pins (3) and prism positioning pins (4) arranged vertically on the fixture (1).

3. The method for rapidly aligning the coordinate system of a machining center for shell-type applications as described in claim 2, characterized in that: The coordinate probe (6) approaches the fixture positioning pin until the coordinate probe (6) contacts the fixture positioning pin, generating the coordinates of the fixture positioning pin by: the coordinate probe (6) approaches the end center of the cylindrical positioning pin (3) until the coordinate probe (6) contacts the end center of the cylindrical positioning pin (3), generating the coordinates of the cylindrical positioning pin (3); and the coordinate probe (6) approaches the end center of the prism positioning pin (4) until the coordinate probe (6) contacts the end center of the prism positioning pin (4), generating the coordinates of the prism positioning pin (4).

4. The method for rapidly aligning the coordinate system of a fixture in a shell-type machining center as described in claim 3, characterized in that: The coordinate probe (6) approaches the end center of the cylindrical positioning pin (3) from multiple directions until the coordinate probe (6) contacts the end center of the cylindrical positioning pin (3), generating multiple coordinates of the cylindrical positioning pin (3), and the average value of the multiple coordinates of the cylindrical positioning pin (3) is taken as the coordinate of the cylindrical positioning pin (3); the coordinate probe (6) approaches the end center of the prism positioning pin (4) from multiple directions until the coordinate probe (6) contacts the end center of the prism positioning pin (4), generating multiple coordinates of the prism positioning pin (4), and the average value of the multiple coordinates of the prism positioning pin (4) is taken as the coordinate of the prism positioning pin (4).

5. The method for rapidly aligning the coordinate system of a fixture in a shell-type machining center as described in claim 1, characterized in that: The clamp (1) has three or four clamp support rods (5) arranged vertically around it; the coordinate probe (6) approaches the three or four clamp support rods (5) along the Z-axis until the coordinate probe (6) contacts the three or four clamp support rods (5) respectively, generating the coordinates of the three or four clamp support rods (5).

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