Steel ball wrong die detection device and orientation calibration method

Abstract

The application relates to a steel ball misalignment detection device and a position calibration method, and relates to the technical field of mold detection. At present, the misalignment amount of upper and lower molds in a steel ball forging process is not easy to measure, and the misalignment angle cannot be calibrated. The application comprises a rotary motor, the rotary motor is installed on a fixed plate through a connecting rod, a positioning tool is installed on the output shaft of the rotary motor, a steel ball forging is placed on the positioning tool, a lower half ball distance measuring instrument detects laser pointing to the lower half ball of the steel ball forging, and an upper half ball distance measuring instrument detects laser pointing to the upper half ball of the steel ball forging. The rotary motor drives the steel ball forging to rotate circumferentially, distance measuring instruments respectively measure the distance change between the upper and lower half balls of the steel ball forging and a reference surface, the misalignment distance and the misalignment angle of the upper and lower half balls of the steel ball forging are converted, zero point mark symbols are set on the steel ball mold, the misalignment angle is spatially converted with mold coordinates, the misalignment azimuth angle of the upper and lower molds is obtained, and the mold position is adjusted. The application is applied to the steel ball misalignment detection device.

Description

Technical Field

[0001] This invention relates to the field of mold inspection technology, and in particular to a steel ball misalignment detection device and orientation calibration method. Background Technology

[0002] Bearing steel balls are typically forged using two hemispherical dies. During the die-closing process, due to various factors such as machining tolerances, installation errors, and press operating accuracy, the two hemispheres often become misaligned. This misalignment reduces the operating accuracy of the bearing steel balls, causing the bearing to wobble and become unstable during operation, affecting the precision and performance of the equipment. It also increases friction and wear; misalignment leads to uneven contact between the steel balls, increasing friction and accelerating wear on the steel balls and bearing, shortening its service life. Simultaneously, it generates noise and vibration. Unstable operation increases noise and vibration, affecting the operating environment and comfort of the equipment, and impacting load-bearing capacity. Misalignment may reduce the bearing's load-bearing capacity, making it unable to effectively support and transmit loads. Therefore, die misalignment detection is essential for improving product quality. Currently, in existing steel ball forging processes, the amount of misalignment between the upper and lower dies is difficult to detect, and the misalignment angle cannot be calibrated. Common detection methods often involve measuring the diameter, roundness, and roughness of the bearing steel balls using calipers or micrometers to determine if the die is correct. This method is simple and intuitive, but it is inefficient, cannot detect surface defects in steel balls, and has problems with low detection accuracy and high randomness, which gradually makes it unable to meet the development needs of precision forging. Summary of the Invention

[0003] This invention aims to solve the problems of difficulty in measuring the misalignment of the upper and lower dies and the inability to calibrate the misalignment angle in the existing steel ball forging process. It provides a steel ball misalignment detection device and orientation calibration method. A rotary motor drives the steel ball forging to rotate circumferentially, and a rangefinder measures the distance changes between the upper and lower hemispheres of the forging and a reference surface. The misalignment distance and angle of the upper and lower hemispheres are calculated. By setting a zero-point marker on the steel ball die, the misalignment angle can be spatially converted from the die coordinates to obtain the misalignment azimuth angle of the upper and lower dies, guiding the adjustment of the die position.

[0004] The technical solution of this invention is:

[0005] A steel ball misalignment detection device includes a fixed plate, a connecting rod, a rotary motor, a positioning fixture, a lower hemisphere rangefinder, an upper hemisphere rangefinder, and a steel ball forging;

[0006] One end of the connecting rod is connected to the housing of the rotary motor, and the other end of the connecting rod is vertically fixed to the bottom of the fixed plate. The rotary motor and the fixed plate are installed together by the connecting rod to form the main frame for steel ball misalignment detection. The output shaft of the rotary motor is inserted into the positioning fixture slot and fixedly connected to the positioning fixture. The output shaft of the rotary motor drives the positioning fixture to rotate. The upper part of the positioning fixture passes through a circular hole on the fixed plate, and the circular hole is located at the center of the fixed plate.

[0007] A rotary motor drives a positioning fixture to rotate at a circular hole. A steel ball forging is mounted on the positioning fixture. The lower hemisphere rangefinder and the upper hemisphere rangefinder are symmetrically mounted above the fixed plate. The detection laser of the lower hemisphere rangefinder points to the lower hemisphere of the steel ball forging, and the detection laser of the upper hemisphere rangefinder points to the upper hemisphere of the steel ball forging.

[0008] Furthermore, the positioning fixture has a support plate forming a three-claw support structure. The inner diameter of the three-claw support structure is larger than the outer diameter of the steel ball forging and smaller than the flash of the steel ball forging.

[0009] Furthermore, the three-jaw support structure of the positioning fixture allows the steel ball forging to be placed horizontally on the fixed plate, and the inner diameter of the three-jaw support structure of the positioning fixture limits the lower hemisphere of the steel ball forging for coarse positioning.

[0010] Furthermore, the steel ball forging includes an upper hemisphere, a lower hemisphere, and a flash. The upper hemisphere has a raised mark, which is the zero-point azimuth angle of the steel ball forging and the mold.

[0011] Furthermore, the detection position of the upper hemisphere rangefinder is at the same height as the protrusion on the steel ball forging, so that the upper hemisphere rangefinder can detect the zero-point azimuth angle.

[0012] Furthermore, the lower hemisphere rangefinder and the upper hemisphere rangefinder are arranged at 180° above the fixed plate, and the two detection lasers of the lower hemisphere rangefinder and the upper hemisphere rangefinder are collinear and intersect the rotation axis of the rotary motor.

[0013] Furthermore, both the lower hemisphere rangefinder and the upper hemisphere rangefinder are laser rangefinders with a detection accuracy of 0.002 mm.

[0014] Furthermore, the rotary motor is a high-precision servo motor, which can output the rotation angle of the rotary motor.

[0015] Furthermore, this orientation determination method includes the following steps:

[0016] Step 1: Location:

[0017] The steel ball forging is placed on the positioning fixture. The three-jaw support structure of the positioning fixture is used to ensure that the steel ball forging is placed horizontally. At the same time, the inner diameter of the three-jaw support is used to limit the lower hemisphere of the steel ball forging for coarse positioning.

[0018] Step 2: Detect the initial coordinate system:

[0019] The rotary motor drives the positioning fixture and the steel ball forging to rotate synchronously and uniformly around the rotation center point O. The hemispherical rangefinder collects the distance between the measurement point on the surface of the steel ball forging and the reference plane N of the hemispherical rangefinder. Due to the zero-point protrusion, the detection data changes drastically. The upper hemispherical marker point C is located, and its position in the detection coordinate system can be determined. Distance within and included angle ;

[0020] Step 3: Calculate the mismode distance:

[0021] By rotating the ball 360° and comparing the maximum and minimum values ​​of the data measured in the upper and lower hemispheres, along with the corresponding motor rotation angles, the center point A of the lower hemisphere of the steel ball forging was determined in the detection coordinate system. Distance within and included angle The center point B of the upper hemisphere of the steel ball forging is in the detection coordinate system. Distance within and included angle The misalignment distance between the upper and lower hemispheres of the steel ball forging can be calculated using the law of cosines. Length;

[0022] Step 4: Install the mold:

[0023] With the center point B of the upper hemisphere of the steel ball forging as the origin of the coordinate system and side BC as the abscissa, the mold coordinate system is obtained, i.e. Given the lengths of the four sides and one diagonal of quadrilateral OABC, the Law of Cosines can be used to calculate... and The angle can be used to measure the azimuth angle of the upper and lower hemispheres. This serves as a correction parameter to guide workers in adjusting the installation of the lower hemisphere mold.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] This invention addresses the problem of difficulty in measuring the misalignment of the upper and lower dies and the inability to calibrate the misalignment angle during steel ball forging. It utilizes a rotary motor to drive the steel ball forging circumferentially, and a rangefinder to measure the distance changes between the upper and lower hemispheres of the forging and a reference plane. This distance and angle of misalignment are then calculated. By setting a zero-point marker on the steel ball die, the misalignment angle can be spatially converted from the die coordinates to obtain the misalignment azimuth angle of the upper and lower dies, guiding the adjustment of the die position. This achieves the calibration of the misalignment angle.

[0026] Compared with existing manual inspection methods, this invention mainly utilizes two sets of rangefinders to eliminate the influence of steel ball placement accuracy, thereby improving inspection accuracy; it can also obtain the misalignment angle of the mold through spatial coordinate transformation, guiding the adjustment and installation of the mold; in addition, it has an automated interactive expansion function, which can realize online monitoring of the mold status. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the zero-point marking and misalignment of the steel ball forging of the present invention;

[0029] Figure 3 This is a simplified diagram of parameter calculation for the present invention;

[0030] Figure 4 This is a top view of the fixed plate structure.

[0031] Figure 5 This is a structural diagram of the positioning fixture;

[0032] In the diagram: 1-fixed plate, 2-connecting rod, 3-rotary motor, 4-positioning fixture, 5-lower hemisphere rangefinder, 6-upper hemisphere rangefinder, 7-steel ball forging, 8-round hole, 41-support plate, 71-upper hemisphere, 72-lower hemisphere, 73-flash. Detailed Implementation

[0033] Specific implementation method one: Combining Figure 1 and Figure 5 This embodiment describes a steel ball misalignment detection device, which includes a fixed plate 1, a connecting rod 2, a rotary motor 3, a positioning fixture 4, a lower hemisphere rangefinder 5, an upper hemisphere rangefinder 6, and a steel ball forging 7.

[0034] The rotary motor 3 is connected to one end of the connecting rod 2 on its housing, and the other end of the connecting rod 2 is vertically fixed to the bottom of the fixed plate 1. The rotary motor 3 and the fixed plate 1 are installed together through the connecting rod 2 to form the main frame for detecting misaligned steel balls. The output shaft of the rotary motor 3 is inserted into the slot of the positioning fixture 4 and fixedly connected to the positioning fixture 4. The output shaft of the rotary motor 3 drives the positioning fixture 4 to rotate. The upper part of the positioning fixture 4 passes through the circular hole on the fixed plate 1. The circular hole is opened at the center of the fixed plate 1. The rotary motor 3 drives the positioning fixture 4 to rotate at the circular hole 8. The positioning fixture 4 is equipped with a steel ball forging 7. The lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 are symmetrically installed above the fixed plate 1. The detection laser of the lower hemisphere rangefinder 5 points to the lower hemisphere of the steel ball forging 7, and the detection laser of the upper hemisphere rangefinder 6 points to the upper hemisphere of the steel ball forging 7.

[0035] The connecting rod 2 is a cylindrical structure, with one end being a threaded rod and the other end being a flat structure. The diameter of the threaded rod on the connecting rod 2 is smaller than the diameter of the flange mounting hole on the rotary motor 3, allowing the threaded rod to be inserted into the flange mounting hole on the rotary motor 3 and the nut to be screwed onto the threaded rod. The flat end of the connecting rod 2 is vertically fixed to the bottom of the fixing plate 1. There are four identical connecting rods 2. By setting the connecting rods 2, the rotary motor 3 and the fixing plate 1 can be connected as a whole, thus forming the main frame of the steel ball misalignment detection device.

[0036] The upper hemisphere rangefinder 6 and the lower hemisphere rangefinder 5 are of the same model. The upper hemisphere rangefinder 6 and the lower hemisphere rangefinder have a fixing frame with a U-shaped cross-section. The fixing frame is fastened to the upper hemisphere rangefinder 6 and the lower hemisphere rangefinder 5. The horizontal plate of the fixing frame has a rangefinder mounting hole.

[0037] The fixing plate 1 can be a circular fixing plate, wherein a circular hole 8 is provided at the center of the fixing plate 1. The diameter of the circular hole 8 is slightly larger than the diameter of the positioning fixture 4, so that the positioning fixture 4 passes through the circular hole 8 on the fixing plate 1, thereby enabling the positioning fixture 4 to rotate at the circular hole 8 of the fixing plate 1.

[0038] The fixing plate 1 has a set of symmetrical holes corresponding to the rangefinder mounting holes. When the upper hemisphere rangefinder 6 and the lower hemisphere rangefinder 5 need to be installed on the fixing plate 1, the rangefinder mounting holes on the fixing bracket are aligned with the set of holes on the fixing plate 1. After alignment, bolt assemblies are inserted into the rangefinder mounting holes and the holes on the fixing plate 1 respectively, thereby fixing the upper hemisphere rangefinder 6 and the lower hemisphere rangefinder 5 to both sides of the fixing plate 1.

[0039] Specific implementation method two: In this embodiment, a steel ball misalignment detection device is provided. The positioning fixture 4 has a support plate 41, forming a three-claw support structure. The inner diameter of the three-claw support structure is larger than the outer diameter of the steel ball forging 7 and smaller than the flash 73 of the steel ball forging 7.

[0040] The support plate 41 consists of three support plates 41, each with an arc-shaped outer and inner surface structure. The outer arc-shaped surface of the support plate 41 is on the same vertical plane as the outer diameter of the insert on the positioning fixture 4. The three support plates 41 are arranged at 360 degrees above the positioning fixture 4, with adjacent support plates 41 arranged at 120 degrees. The support plate 41 and the insert on the positioning fixture 4 are integral structures. The output shaft of the rotary motor 3 is inserted into the insert on the positioning fixture 4, and a pin hole is opened along the annular surface of the insert. A pin is inserted into the pin hole to fix the output shaft of the rotary motor 3 to the positioning fixture 4. When the output shaft of the rotary motor 3 rotates, it drives the positioning fixture 4 to rotate simultaneously, thereby driving the support plate 41 to rotate.

[0041] The diameter of the circular trajectory of the three-claw support structure is larger than the outer diameter of the steel ball forging 7 and smaller than the flash of the steel ball forging 7, so that the steel ball forging 7 can be placed inside the three-claw support structure.

[0042] Specific implementation method three: In this embodiment, a steel ball misalignment detection device is provided. The three-jaw support structure of the positioning fixture 4 allows the steel ball forging 7 to be placed horizontally on the fixed plate 1. The inner diameter of the three-jaw support structure of the positioning fixture 4 limits the lower hemisphere 72 of the steel ball forging 7 for coarse positioning.

[0043] The plane of the three-jaw support structure of the positioning fixture 4 is on the same horizontal plane as the upper surface of the fixing plate 1. Therefore, when the steel ball forging 7 is placed in the three-jaw support structure of the positioning fixture 4, the upper end face of the steel ball forging 7 and the fixing plate 1 is on the same horizontal plane.

[0044] Specific Implementation Method 4: A steel ball misalignment detection device of this embodiment, wherein the steel ball forging 7 includes an upper hemisphere 71, a lower hemisphere 72 and a flash 73, and the upper hemisphere 71 has a raised mark, which is the zero-point azimuth angle of the steel ball forging 7 and the mold.

[0045] The upper hemisphere 71 and the lower hemisphere 72 are fixedly connected, and the burr 73 is disposed at the intersection of the upper hemisphere 71 and the lower hemisphere 72.

[0046] The upper hemisphere 71, lower hemisphere 72, and finial 73 are integral structures. Raised markings are provided on the side of the upper hemisphere.

[0047] Specific Implementation Method 5: In this embodiment, a steel ball misalignment detection device is provided, wherein the detection position of the upper hemisphere rangefinder 6 is at the same height as the protrusion on the steel ball forging 7, so that the upper hemisphere rangefinder 6 can detect the zero-point azimuth angle.

[0048] When the upper hemisphere rangefinder 6 emits a laser line at the detection position, the laser line is at the same height as the protrusion on the steel ball forging 7. The height at which the upper hemisphere rangefinder 6 is installed on the fixed plate 1 is slightly higher than the height at which the lower hemisphere rangefinder 5 is installed on the fixed plate 1.

[0049] Specific Implementation Method Six: In this implementation method, a steel ball misalignment detection device is provided, wherein the lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 are arranged at 180° above the fixed plate 1, and the two detection lasers of the lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 are collinear and intersect with the rotation axis of the rotary motor 3.

[0050] When the lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 are working, the detection laser emitted by the lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 intersects with the rotation axis of the rotary motor 3. Therefore, the lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 are symmetrically installed on both sides of the fixed plate 1 for use.

[0051] Specific Implementation Method Seven: In this implementation method, a steel ball misalignment detection device is provided, wherein both the lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 are laser rangefinders with a detection accuracy of 0.002mm.

[0052] When the lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 are operating, they emit a narrow-pulse laser beam as a detection laser. This detection laser is directed at the target object, which is a steel ball forging 7. A portion of the detection laser is reflected back from the target, and the receivers in the lower hemisphere rangefinder 5 and the upper hemisphere rangefinder 6 receive these reflected laser pulses. By measuring the time interval between the laser pulse's emission and reception, and utilizing the relationship between the speed of light and time, the distance between the target and the instrument can be accurately calculated.

[0053] Specific Implementation Method 8: In this implementation method, a steel ball misalignment detection device is provided, wherein the rotary motor 3 is a high-precision servo motor, which can output the rotation angle of the rotary motor 3.

[0054] The rotary motor 3 is a high-precision servo motor, which mainly consists of a stator and a rotor. The stator has windings that generate a rotating magnetic field when three-phase alternating current is applied to them. The rotor has permanent magnets or magnetically conductive materials, and it rotates under the influence of the rotating magnetic field. Simultaneously, feedback devices such as encoders transmit the rotor's position and speed information to the controller. The controller adjusts the input signal based on the feedback information, thereby achieving precise position control and speed regulation, ensuring the accuracy of steel ball forging inspection.

[0055] Specific Implementation Method Nine: A method for calibrating the orientation of a steel ball misalignment detection device according to this embodiment, the method comprising the following steps:

[0056] Step 1: Location:

[0057] The steel ball forging 7 is placed on the positioning fixture 4. The three-jaw support structure of the positioning fixture 4 is used to ensure that the steel ball forging 7 is placed horizontally. At the same time, the inner diameter of the three-jaw support is used to limit the lower hemisphere 72 of the steel ball forging 7 for rough positioning.

[0058] Step 2: Detect the initial coordinate system:

[0059] Rotary motor 3 drives positioning fixture 4 and steel ball forging 7 to rotate synchronously and uniformly around the rotation center point O. The hemispherical rangefinder 6 collects the distance between the measuring point on the surface of the steel ball forging 7 and the reference plane N of the hemispherical rangefinder 6. Due to the zero-point protrusion, the detection data changes drastically. The upper hemispherical mark point C is located, and its position in the detection coordinate system can be determined. Distance within and included angle ;

[0060] Step 3: Calculate the mismode distance:

[0061] By rotating 360° and comparing the maximum and minimum values ​​of the data measured in the upper and lower hemispheres 72 and the corresponding motor rotation angles, the center point A of the lower hemisphere of the steel ball forging 7 in the detection coordinate system is obtained. Distance within and included angle The center point B of the upper hemisphere of the steel ball forging 7 is in the detection coordinate system. Distance within and included angle According to the law of cosines, the misalignment distance between the upper and lower hemispheres of the steel ball forging 7 can be calculated. Length;

[0062] Step 4: Install the mold:

[0063] With the center point B of the upper hemisphere 71 of the steel ball forging 7 as the origin of the coordinate system and the BC side as the abscissa, the mold coordinate system is obtained, i.e. Given the lengths of the four sides and one diagonal of quadrilateral OABC, the Law of Cosines can be used to calculate... and The angle can be used to measure the azimuth angle of the upper and lower hemispheres. This serves as a correction parameter to guide workers in adjusting the installation of the lower hemisphere 72 mold.

[0064] The above method solves the problem that the misalignment of the upper and lower dies is difficult to measure and the misalignment angle cannot be calibrated during the steel ball forging process. By driving the steel ball forging to rotate circumferentially with a rotary motor, the distance between the upper and lower hemispheres of the steel ball forging and the reference plane is measured by a rangefinder, and the misalignment distance and misalignment angle of the upper and lower hemispheres of the steel ball forging are calculated. By setting a zero-point mark symbol on the steel ball die, the misalignment angle and the die coordinates can be spatially converted to obtain the misalignment azimuth angle of the upper and lower dies, which guides the adjustment of the die position.

[0065] The steel ball misalignment detection and orientation calibration method proposed in this invention uses two sets of rangefinders to eliminate the influence of steel ball placement accuracy, thereby improving detection accuracy. Furthermore, it can obtain the misalignment azimuth angle through spatial coordinate transformation to guide mold adjustment and installation. In addition, it has an automated interactive expansion function, which can realize online monitoring of mold status.

[0066] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to well understand and utilize the invention. The invention is limited only to the claims and their full scope and equivalents.

Claims

1. A steel ball misalignment detection device, characterized in that, It includes a fixed plate (1), a connecting rod (2), a rotary motor (3), a positioning fixture (4), a lower hemisphere rangefinder (5), an upper hemisphere rangefinder (6), and a steel ball forging (7); The upper part of the housing of the rotary motor (3) is connected to one end of the connecting rod (2), and the other end of the connecting rod (2) is vertically fixed to the bottom of the fixing plate (1). The rotary motor (3) and the fixing plate (1) are installed through the connecting rod (2) to form the main frame of the steel ball misalignment detection. The output shaft of the rotary motor (3) is inserted into the slot of the positioning fixture (4) and fixedly connected to the positioning fixture (4). The upper part of the positioning fixture (4) passes through the circular hole (8) at the center of the fixed plate (1). The rotary motor (3) drives the positioning fixture (4) to rotate in the circular hole (8). A steel ball forging (7) is installed on the positioning fixture (4). The lower hemisphere rangefinder (5) and the upper hemisphere rangefinder (6) are symmetrically installed on the upper part of the fixed plate (1) with the center line of the fixed plate (1) as the center. The detection laser of the lower hemisphere rangefinder (5) points to the lower hemisphere of the steel ball forging (7), and the detection laser of the upper hemisphere rangefinder (6) points to the upper hemisphere of the steel ball forging (7). The steel ball forging (7) includes an upper hemisphere (71), a lower hemisphere (72) and a flash (73). The upper hemisphere (71) has a protrusion and a mark is made on the protrusion to form a protrusion mark. The protrusion mark is the zero azimuth angle of the steel ball forging (7) and the mold. The detection position of the upper hemisphere rangefinder (6) is at the same height as the protrusion on the steel ball forging (7), so that the upper hemisphere rangefinder (6) can detect the zero azimuth angle.

2. The steel ball misalignment detection device according to claim 1, characterized in that, The positioning fixture (4) is equipped with a support plate (41), which is a three-claw support structure. The inner diameter of the three-claw support structure is larger than the outer diameter of the steel ball forging (7) and smaller than the flash (73) of the steel ball forging (7).

3. The steel ball misalignment detection device according to claim 1 or 2, characterized in that, The three-jaw support structure of the positioning fixture (4) allows the steel ball forging (7) to be placed horizontally on the fixed plate (1). The inner diameter of the three-jaw support structure of the positioning fixture (4) limits the lower hemisphere (72) of the steel ball forging (7) for rough positioning.

4. The steel ball misalignment detection device according to claim 1, characterized in that, The lower hemisphere rangefinder (5) and the upper hemisphere rangefinder (6) are arranged at 180° above the fixed plate (1). The two detection lasers of the lower hemisphere rangefinder (5) and the upper hemisphere rangefinder (6) are collinear and intersect with the rotation axis of the rotary motor (3).

5. The steel ball misalignment detection device according to claim 4, characterized in that, Both the lower hemisphere rangefinder (5) and the upper hemisphere rangefinder (6) are laser rangefinders with a detection accuracy of 0.002 mm.

6. The steel ball misalignment detection device according to claim 1, characterized in that, The rotary motor (3) is a high-precision servo motor, which can output the rotation angle of the rotary motor (3).

7. A method for orientation calibration using the steel ball misalignment detection device as described in claim 1, characterized in that, The method includes the following steps: Step 1: Location: The steel ball forging (7) is placed on the positioning fixture (4). The three-jaw support structure of the positioning fixture (4) ensures that the steel ball forging (7) is placed horizontally. At the same time, the inner diameter of the three-jaw support limits the lower hemisphere (72) of the steel ball forging (7) for rough positioning. Step 2: Detect the initial coordinate system: The rotary motor (3) drives the positioning fixture (4) and the steel ball forging (7) to rotate synchronously and uniformly around the rotation center point O. The upper hemisphere rangefinder (6) collects the distance between the measuring point on the surface of the steel ball forging (7) and the reference plane N of the upper hemisphere rangefinder (6). Due to the zero-point protrusion, the detection data changes drastically. The upper hemisphere mark point C is found, and it can be known that it is in the detection coordinate system. Distance within and included angle ; Step 3: Calculate the mismode distance: By rotating 360° and comparing the maximum and minimum values ​​of the data measured in the upper and lower hemispheres (72) and the corresponding motor rotation angles, the center point A of the lower hemisphere (72) of the steel ball forging (7) in the detection coordinate system is obtained. Distance within and included angle The center point B of the upper hemisphere of the steel ball forging (7) is in the detection coordinate system. Distance within and included angle According to the cosine theorem, the misalignment distances of the upper hemisphere (71) and lower hemisphere (72) of the steel ball forging (7) can be calculated, i.e. Length; Step 4: Install the mold: With the center point B of the upper hemisphere (71) of the steel ball forging (7) as the origin of the coordinate system and the BC side as the abscissa, the mold coordinate system is obtained, i.e. Given the lengths of the four sides and one diagonal of quadrilateral OABC, the Law of Cosines can be used to calculate... and From the angle, the misalignment azimuth angles of the upper hemisphere (71) and the lower hemisphere (72) can be measured. As a correction parameter, it guides workers to adjust the installation of the lower hemisphere (72) mold.

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