A wire drawing die concentricity measuring device and method

Abstract

The present invention relates to a device and method for measuring the concentricity of a wire drawing die, comprising: a main frame structure, a light source lens, an electromagnetic induction measurement platform, and a measurement lens disposed on the main frame structure; a wire drawing die to be measured is placed on the electromagnetic induction measurement platform; the electromagnetic induction measurement platform is used to support the wire drawing die and measure the position coordinates of the center point of the wire drawing die jacket; the measurement lens, the electromagnetic induction measurement platform, and the light source lens are arranged in descending order; the light source lens is used to emit a light spot, which enters the light source lens through the die hole of the wire drawing die located on the electromagnetic induction measurement platform; the light source lens is used to amplify the light spot and form an image on the image sensor on the measurement lens. The beneficial effects of the present invention are that the entire device has no moving parts, the system structure is strong, measurement accuracy is guaranteed, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the fields of wire drawing die measurement, optical measurement and electromagnetic measurement, and in particular to a wire drawing die concentricity measurement device and a measurement method. Background Art

[0002] There is a lack of methods and devices for measuring the concentricity of the outer shell and the die hole of wire drawing dies at home and abroad. With the development of electronic equipment, wire and cable industries, the size of the die hole of wire drawing dies is getting smaller and smaller, and the minimum can be less than 20 microns. The concentricity of the wire drawing die directly affects the stability and consistency of the wire drawing process. Therefore, it is particularly important to detect the concentricity of the wire drawing die. Ordinary concentricity measuring instruments are generally composed of components such as a movable bracket, a dial indicator, and a dial indicator bracket. This type of device requires the needle to directly contact the object to be measured. The inner hole of the wire drawing die can be as small as less than 20 microns. However, ordinary concentricity measuring instruments cannot effectively measure wire drawing dies with smaller die holes; the die hole and the outer shell cannot be seen at the same time through optical high-power microscope magnification. Switching between different optical microscopes and optical projectors is inefficient and the measurement results are greatly affected by the stability of the structure. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device and method for measuring the concentricity of a wire drawing die, so as to solve the problem that the existing device cannot measure, has poor accuracy and low efficiency because the minimum inner hole of the wire drawing die can be less than 20 microns.

[0004] The present invention solves the above-mentioned technical problem with the following technical solution: A wire drawing die concentricity measuring device comprising: a main frame structure and a light source lens, an electromagnetic induction measuring platform, and a measuring lens arranged on the main frame structure; a wire drawing die to be measured is placed on the electromagnetic induction measuring platform; the electromagnetic induction measuring platform is used to support the wire drawing die and measure the position coordinates of the center point of the outer shell of the wire drawing die;

[0005] The measuring lens, the electromagnetic induction measuring platform and the light source lens are arranged in sequence from high to low. The light source lens is used to emit a light spot, and the light spot enters the light source lens through the die hole of the drawing die located on the electromagnetic induction measuring platform. The light source lens is used to amplify the light spot and form an image in the image sensor on the measuring lens.

[0006] The beneficial effects of the present invention are as follows: the main frame structure is used to securely connect the various components, providing a mounting base for each component and enhancing stability; an electromagnetic induction measurement platform supports the drawing die and measures the position coordinates of the center of the die jacket; a light source lens is used to emit a light spot, and a measurement lens is used to amplify the light spot and image it within an image sensor on the measurement lens. The entire device has no moving parts, resulting in a high-strength system that ensures measurement accuracy and low cost; measurement personnel do not require training; simply placing the die in a designated area allows for measurement, resulting in simple operation. The optical measurement system and electromagnetic induction system are combined to achieve efficient measurement of the concentricity of the drawing die.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the electromagnetic induction measurement platform includes: a mold carrier, a sensor fixing bracket and a sensor. Four sensors are arranged along the diagonal lines on the mold carrier, and two sensors arranged along the same diagonal line are arranged opposite to each other. The angle between adjacent sensors is 90°, and the sensor is installed on the mold carrier through the sensor fixing bracket.

[0009] The beneficial effects of adopting the above-mentioned further scheme are: the distance from the sensor probe to the drawing die jacket is accurately collected by the sensor, the sensor has a fast response speed, and the measurement result can be calculated in 2-3 seconds, and the measurement efficiency is high; four sensors are used to measure the distance from the drawing die jacket respectively, and the angle between two adjacent sensors is 90°. This layout ensures the accuracy of the measurement results, thereby improving the stability and reliability of the entire measurement system; the sensor fixing bracket provides an installation base for the sensor, making the installation and removal of the sensor simple and quick.

[0010] Furthermore, the sensor is an eddy current sensor.

[0011] The beneficial effect of adopting the above further solution is: the distance from the sensor probe to the outer jacket of the wire drawing die is accurately collected by using the eddy current sensor, and the measurement accuracy is high.

[0012] Furthermore, the die carrier between the eddy current sensors is used to place the wire drawing die;

[0013] The sensor fixing bracket drives the eddy current sensor to move closer to or away from the wire drawing die.

[0014] The beneficial effects of adopting the above-mentioned further scheme are: the setting position of the drawing die is limited to an adjustable range between the eddy current sensors, further improving the measurement efficiency; the setting of the sensor fixing bracket realizes the adjustable distance of the eddy current sensor, so that the electromagnetic induction measurement platform can adaptively adjust the position of the eddy current sensor according to the drawing dies of different sizes and specifications, thereby improving the versatility and applicability of the measurement.

[0015] Also disclosed is a method for measuring the concentricity of a wire drawing die. Using the above-mentioned wire drawing die concentricity measuring device, the method for measuring the concentricity of a wire drawing die includes:

[0016] Placing the drawing die on an electromagnetic induction measurement platform, and measuring the distance from the outer surface of the drawing die by an eddy current sensor;

[0017] Calculating the position coordinates of the midpoint between a pair of the eddy current sensors based on the position coordinates of the center points of the eddy current sensors to obtain the position coordinates of the two midpoints;

[0018] Drawing reference auxiliary lines through the midpoints respectively, and calculating the position coordinates of the intersection of the two reference auxiliary lines based on the position coordinates of the two midpoints, wherein the intersection is the center point of the wire drawing die jacket;

[0019] The light source lens emits a light spot, and the light spot is imaged in the measuring lens through the die hole of the drawing die. The center point of the image is the center point of the die hole of the drawing die, and the position coordinates of the center point of the die hole of the drawing die are calculated;

[0020] The concentricity of the wire drawing die is calculated based on the position coordinates of the center point of the wire drawing die housing and the position coordinates of the center point of the wire drawing die hole.

[0021] The beneficial effects of adopting the above-mentioned further scheme are: using an eddy current sensor, the coordinate position of the center of the jacket relative to the electromagnetic induction measurement platform can be accurately calculated based on the eddy current effect, and then a high-power optical microscope is used to image the die hole to obtain the coordinate position of the center of the die hole relative to the electromagnetic induction measurement platform, and then the two sets of coordinates are solved by the formula; thereby, the concentricity is quickly calculated and the measurement is achieved in seconds. When applied to the field of wire drawing die measurement, it solves the shortcomings of the existing technology very well; it can realize the measurement of the concentricity of wire drawing dies with smaller die holes. Based on the fast response of the sensor, the measurement results can be calculated in 2-3 seconds, and the measurement efficiency is high; the measurement accuracy is high, specifically reaching ±1.5 microns, the measurement operation is simple, and it can be used for batch automated measurement.

[0022] Furthermore, before placing the wire drawing die, it is also necessary to establish a plane rectangular coordinate system on the electromagnetic induction measurement platform to determine the position coordinates of the center points of each of the eddy current sensors.

[0023] The beneficial effects of adopting the above further scheme are: by establishing a plane rectangular coordinate system and accurately positioning the center point of each eddy current sensor on the coordinate system, the standardization and accuracy of the measurement process can be ensured, which helps to reduce the measurement deviation caused by human operation or equipment error and improve the accuracy and reliability of the measurement; the four eddy current sensors are placed perpendicular to each other, and the angle between each sensor and the coordinate system is 45°, which can simplify the subsequent calculation process; the standardized measurement method and simplified calculation process make the entire measurement process more efficient, thereby shortening the measurement cycle. Furthermore, before establishing the plane rectangular coordinate system, the origin of the coordinate system needs to be calibrated. The calibration method of the origin of the coordinate system includes:

[0024] Place the calibration rod end-side up into the electromagnetic induction measurement platform until it forms an image in the image sensor of the measurement lens, and calculate the position coordinates of the imaging center point;

[0025] measuring the distance from the outer surface of the calibration measuring rod by the eddy current sensor, and calculating the position coordinates of the midpoint of the end surface of the calibration measuring rod based on the measurement values;

[0026] An offset calculation result is obtained based on the position coordinates of the midpoint of the end face of the calibration measuring rod and the position of the coordinate system origin of the electromagnetic induction measurement system. In the optical measurement system, the coordinate system origin of the optical measurement system is obtained according to the offset calculation result and the position coordinates of the imaging center point, thereby completing the calibration of the coordinate system origin.

[0027] The beneficial effects of this further approach include: by calibrating the coordinate system origin, the electromagnetic induction measurement system and the optical measurement system can be linked, eliminating measurement errors caused by inter-system deviations and ensuring the objectivity and accuracy of subsequent measurement results. This method combines the advantages of electromagnetic induction and optical measurement, and the two measurement systems work together to measure the concentricity of wire drawing dies. Regular calibration and verification ensure the long-term high accuracy and reliability of the measurement device.

[0028] Furthermore, in the step of placing the wire drawing die on an electromagnetic induction measurement platform and measuring the distance from the outer surface of the wire drawing die by an eddy current sensor:

[0029] The wire drawing die is placed between the four eddy current sensors on the electromagnetic induction measurement platform. The wire drawing die is spaced apart from each eddy current sensor, and the distance between the center point of each eddy current sensor and the outer surface of the wire drawing die is measured.

[0030] The beneficial effects of adopting the above-mentioned further scheme are: the specific setting position of the wire drawing die on the electromagnetic induction measurement platform is not limited, and there is no need for initial positioning, thereby eliminating the positioning step and process time. The wire drawing die does not contact the sensor, realizing non-contact measurement, avoiding friction and wear caused by contact, and extending the service life of the measuring equipment and mold; the distance value is measured based on the eddy current sensor, and the measurement process is efficient and accurate, thereby reducing the measurement cost and improving economic benefits.

[0031] Furthermore, the step of drawing reference auxiliary lines through the midpoints in sequence, and calculating the position coordinates of the intersection of the two reference auxiliary lines based on the position coordinates of the two midpoints, wherein the intersection is the center point of the wire drawing die jacket, includes:

[0032] A pair of parallel lines of the eddy current sensors arranged opposite to each other are sequentially drawn through the midpoint to obtain two parallel lines;

[0033] The position coordinates of the intersection point of the two parallel lines are calculated based on the position coordinates of the two midpoints.

[0034] The beneficial effects of adopting the above-mentioned further scheme are: by drawing parallel lines through the midpoint and finding the intersection, the center point position of the drawing die jacket can be accurately determined; through the automated measurement and calculation process, the center point position coordinates of the drawing die jacket can be quickly obtained, thereby improving measurement efficiency and shortening the measurement cycle; there is no need to use complex measuring equipment and tools, only eddy current sensors are needed to achieve high-precision measurement, thereby reducing measurement costs.

[0035] Furthermore, the calculation formula of the concentricity of the drawing die is:

[0036]

[0037] Where, is the horizontal coordinate of the center point of the die hole of the wire drawing die, is the horizontal coordinate of the center point of the drawing die jacket, is the ordinate of the center point of the die hole of the wire drawing die, is the ordinate of the center point of the drawing die jacket.

[0038] The beneficial effect of adopting the above-mentioned further scheme is: by calibrating the origin of the coordinate system of the electromagnetic induction measurement system and the optical measurement system, it can be ensured that the two measurement systems are measured in the same coordinate system, so that the concentricity of the drawing die can be directly calculated using the formula in the same coordinate system without the need for complex coordinate conversion or data correction, which simplifies the calculation process and improves work efficiency; the concentricity of the drawing die with a smaller die hole can be measured, the measurement operation is simple, and it can be used for batch automated measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall structure of a measuring device according to an embodiment of the present invention;

[0040] Figure 2 This is a structural diagram of an electromagnetic induction measurement platform in one embodiment of the present invention;

[0041] Figure 3 A schematic flow chart of a method for measuring the concentricity of a wire drawing die according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of measuring the center point of the wire drawing die jacket in one embodiment of the present invention.

[0043] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0044] 001. Light source lens; 002. Electromagnetic induction measurement platform; 003. Wire drawing die; 004. Measuring lens; 005. Main frame structure; 006. Eddy current sensor; 007. Sensor fixing bracket; 008. Mold carrier. DETAILED DESCRIPTION

[0045] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0046] In a first aspect, the present invention discloses a device for measuring the concentricity of a wire drawing die, comprising: a main frame structure 005, and a measuring lens 004, an electromagnetic induction measuring platform 002, and a light source lens 001, all disposed on the main frame structure 005. The measuring lens 004, the electromagnetic induction measuring platform 002, and the light source lens 001 are disposed sequentially from high to low. It is conceivable that the light source lens 001, the electromagnetic induction measuring platform 002, and the measuring lens 004 are sequentially mounted on the main frame structure 005 via their respective mounting brackets. During a specific measurement process, a wire drawing die 003 to be measured is placed on the electromagnetic induction measuring platform 002, and the distance between the measuring lens 004 and the wire drawing die 003 is adjustable, so that a light spot emitted by the light source lens 001 enters the measuring lens 004 through the die hole of the wire drawing die 003 on the electromagnetic induction measuring platform 002, is amplified by the measuring lens 004, and is imaged in an image sensor, wherein the image sensor is provided on the measuring lens 004 and is disposed at the end of the measuring lens 004 facing away from the wire drawing die 003.

[0047] In this embodiment, the main frame structure 005 is used to securely connect the various components, providing a mounting base for each component and enhancing stability. The electromagnetic induction measurement platform 002 supports the drawing die 003 and measures the coordinates of the center of the outer shell of the drawing die 003. The light source lens 001 emits a light spot, and the measurement lens 004 amplifies the light spot and forms an image on the image sensor on the measurement lens 004. The entire device has no moving parts, resulting in a high-strength system that ensures measurement accuracy and low cost. Measurement personnel do not require training; simply place the die in a designated area for measurement, resulting in simple operation. The optical measurement system and electromagnetic induction system work together to efficiently measure the concentricity of the drawing die 003.

[0048] like Figure 2 As shown, in the preferred embodiment, the electromagnetic induction measurement platform 002 includes: a mold carrier 008, a sensor fixing bracket 007 and a sensor. In this embodiment, the sensor adopts an eddy current sensor 006, and the specific preamplifier is not specifically limited. The eddy current sensor 006 is used to collect the distance from the probe on the eddy current sensor 006 to the outer jacket of the wire drawing die 003. The mold carrier 008 is roughly rectangular, and a sensor fixing bracket 007 is installed along each corner end of the mold carrier 008. Each sensor fixing bracket 007 is installed with an eddy current sensor 006, that is, in this embodiment, a total of 4 eddy current sensors 006 are provided, and the eddy current sensors 006 are fixed by the sensor fixing bracket 007. During the specific measurement, the wire drawing die 003 is carried by the mold carrier 008, and the wire drawing die 003 is placed between the eddy current sensors 006.

[0049] Specifically, four eddy current sensors 006 are respectively arranged along the diagonal lines on the mold carrier 008, and two eddy current sensors 006 arranged along the same diagonal line are arranged opposite to each other, and the angle between adjacent eddy current sensors 006 is 90°.

[0050] In this embodiment, the eddy current sensor 006 is used to accurately collect the distance from the sensor probe to the outer jacket of the drawing die 003, and the sensor has a fast response speed, and the measurement result can be calculated in 2-3 seconds, so the measurement efficiency is high; four sensors are used to measure the distance from the outer jacket of the drawing die 003 respectively, and the angle between two adjacent sensors is 90°. This layout ensures the accuracy of the measurement results, thereby improving the stability and reliability of the entire measurement system; the sensor fixing bracket 007 provides an installation base for the sensor, making the installation and disassembly of the sensor simple and quick.

[0051] Specifically, the wire drawing die 003 is placed on the die carrier 008 between the four eddy current sensors 006. The wire drawing die 003 is spaced apart from each eddy current sensor 006, and is not limited to being placed in the center of the four eddy current sensors 006, further improving measurement efficiency. At the same time, the sensor fixing bracket 007 can drive the eddy current sensor 006 to move toward or away from the wire drawing die 003, achieving adjustable distance. This allows the electromagnetic induction measurement platform 002 to adaptively adjust the position of the eddy current sensor 006 according to the different sizes and specifications of the wire drawing die 003, improving the versatility and applicability of the measurement.

[0052] Second, as Figure 3 、 Figure 4 As shown, the present invention also discloses a method for measuring the concentricity of a wire drawing die, which uses the above-mentioned wire drawing die concentricity measuring device and specifically includes the following steps:

[0053] S1: Place the wire drawing die 003 on the electromagnetic induction measurement platform 002, and measure the distance from the outer surface of the wire drawing die 003 using the eddy current sensor 006;

[0054] S2: Calculate the position coordinates of the midpoint between a pair of eddy current sensors 006 based on the position coordinates of the center points of each eddy current sensor 006 to obtain the position coordinates of the two midpoints;

[0055] S3: Draw reference auxiliary lines through the midpoints one by one, and calculate the position coordinates of the intersection of the two reference auxiliary lines based on the position coordinates of the two midpoints. The intersection is the center point of the outer jacket of the wire drawing die 003;

[0056] S4: The light source lens 001 emits a light spot, which passes through the die hole of the drawing die 003 and is finally imaged in the measuring lens 004. The center point of the image is the center point of the die hole of the drawing die 003, and the position coordinates of the center point of the die hole of the drawing die 003 are calculated.

[0057] In step S4: an externally connected mobile device can calculate the coordinates of the center point of the die hole of the wire drawing die 003 to be measured, and the measuring lens 004 can be equipped with lens barrels of different magnifications (such as 20 times, 10 times, etc.) to measure the coordinates of the center point of the die hole of the wire drawing die 003.

[0058] S5: Calculating the concentricity of the drawing die 003 based on the position coordinates of the center point of the outer shell of the drawing die 003 and the position coordinates of the center point of the die hole of the drawing die 003.

[0059] In this embodiment, an eddy current sensor 006 is used, so that the coordinate position of the center of the jacket relative to the electromagnetic induction measurement platform 002 can be accurately calculated based on the eddy current effect, and then a high-power optical microscope is used to image the die hole to obtain the coordinate position of the center of the die hole relative to the electromagnetic induction measurement platform 002, and then the two sets of coordinates are solved by a formula; thereby, the concentricity is quickly calculated and the measurement is achieved in seconds. The application in the measurement field of the drawing die 003 has well solved the shortcomings of the existing technology.

[0060] In the above steps, the concentricity of the drawing die 003 with a smaller die hole can be measured. Based on the rapid response of the sensor, the measurement result can be calculated in 2-3 seconds, and the measurement efficiency is high. The measurement accuracy is high, specifically reaching ±1.5 microns, and the measurement operation is simple, which can be used for batch automated measurement.

[0061] In a further solution, before placing the wire drawing die 003 on the electromagnetic induction measurement platform 002, it is necessary to establish a plane rectangular coordinate system about the electromagnetic induction measurement platform 002 to determine the position coordinates of the center points of each eddy current sensor 006. In this embodiment, four eddy current sensors 006 are placed perpendicular to each other on the measurement platform, and a plane rectangular coordinate system is established about the electromagnetic induction measurement platform 002, where the coordinate origin is the center intersection of the probe coils on the four eddy current sensors 006, and each eddy current sensor 006 is at an angle of 45° to the coordinate system. As can be expected, the four eddy current sensors 006 are placed perpendicular to each other to avoid interference between the two probes through the magnetic field, which may cause distortion of the measurement results.

[0062] In this embodiment, the center points of each eddy current sensor 006 are set as: Point A, Point B, Point C, and Point D. The center points of the eddy current sensors 006 are the center points of the probe coils of the four eddy current sensors 006. By establishing a plane rectangular coordinate system and accurately positioning the center points of each eddy current sensor 006 on the coordinate system, the standardization and accuracy of the measurement process can be ensured, which helps to reduce measurement deviations caused by human operation or equipment errors and improve the accuracy and reliability of the measurement. The four eddy current sensors 006 are placed perpendicular to each other, and each sensor is at an angle of 45° to the coordinate system, which can simplify the subsequent calculation process. The standardized measurement method and simplified calculation process make the entire measurement process more efficient, thereby shortening the measurement cycle.

[0063] Before establishing a plane rectangular coordinate system, the origin of the coordinate system needs to be calibrated. The calibration methods for the origin of the coordinate system include:

[0064] Place the calibration rod end-face upward into the electromagnetic induction measurement platform 002, move the calibration rod until it is imaged in the field of view of the image sensor of the measurement lens 004, and identify and calculate the position coordinates of the end-face imaging center point. An external mobile device can be used to calculate the position coordinates of the end-face imaging center point.

[0065] Combine the measurement values ​​of the four eddy current sensors 006 to calculate the position coordinates of the midpoint of the end face of the calibration rod. This step is the same as steps S1-S3. The specific steps are:

[0066] Measure the measured value of the outer surface of the distance calibration rod respectively by 4 eddy current sensors 006, calculate the position coordinate of the midpoint of the end face of the calibration rod based on the measured value; In this step, the setting position of the eddy current sensor 006 in the coordinate system is the same as in step S1, that is, the position coordinate of each eddy current sensor 006 is also the same, and the coordinate origin of the coordinate system is also the same, which is the coordinate origin of the electromagnetic induction measurement system. Based on the position coordinate of each eddy current sensor 006, calculate the position coordinate of the distance midpoint between a pair of relatively arranged eddy current sensors 006, thereby obtaining the position coordinate of two midpoints. Afterwards, make the parallel lines of the corresponding pair of eddy current sensors 006 connection lines through the midpoint respectively, calculate the position coordinate of the intersection of the two parallel lines based on the position coordinate of the two midpoints, and the position coordinate of the intersection is the position coordinate of the midpoint of the end face of the calibration rod.

[0067] The offset calculation result is obtained based on the position coordinates of the midpoint of the end face of the calibration measuring rod and the position of the coordinate system origin of the electromagnetic induction measurement system. In the optical measurement system, the coordinate system origin of the optical measurement system is obtained based on the offset calculation result and the position coordinates of the imaging center point of the end face of the calibration measuring rod. Thus, the electromagnetic induction measurement system and the optical measurement system are linked to complete the calibration of the coordinate system origin.

[0068] In this embodiment, by calibrating the coordinate system origin, the electromagnetic induction measurement system and the optical measurement system are linked, eliminating measurement errors caused by inter-system deviations and ensuring the objectivity and accuracy of subsequent measurement results. This method combines the advantages of electromagnetic induction and optical measurement, and the two measurement systems work together to measure the concentricity of wire drawing die 003. Regular calibration and verification ensure that the measurement device maintains high accuracy and reliability over the long term.

[0069] In step S1, when the drawing die 003 is placed on the electromagnetic induction measurement platform 002, the specific placement of the drawing die 003 on the electromagnetic induction measurement platform 002 is not limited. This eliminates the initial positioning step and process time of the drawing die 003, which helps improve measurement efficiency. Specifically, the drawing die 003 is placed between the four eddy current sensors 006 on the electromagnetic induction measurement platform 002, without contacting each eddy current sensor 006.

[0070] When the drawing die 003 is placed on the electromagnetic induction measurement platform 002, eddy currents are generated within the drawing die 003. According to Lenz's law, the direction of the magnetic field of the eddy current is exactly opposite to the magnetic field of the coil, which will change the impedance value of the coil within the probe. The change in impedance value is directly related to the distance between the coil and the object being measured. The probe on the eddy current sensor 006 is connected to the controller. The controller can obtain the change in voltage value from the sensor probe and use this as a basis to calculate the corresponding distance value. The distance value between point A and the outer surface of the drawing die 003 is set to L1, the distance value between point B and the outer surface of the drawing die 003 is set to L2, the distance value between point C and the outer surface of the drawing die 003 is set to L3, and the distance value between point D and the outer surface of the drawing die 003 is set to L4.

[0071] In this embodiment, the specific setting position of the drawing die 003 on the electromagnetic induction measurement platform 002 is not limited, and there is no need for initial positioning, thereby eliminating the positioning step and process time. The drawing die 003 does not contact the sensor, realizing non-contact measurement, avoiding friction and wear caused by contact, and extending the service life of the measuring equipment and the die; the distance value is measured based on the eddy current sensor 006, and the measurement process is efficient and accurate, thereby reducing the measurement cost and improving economic benefits.

[0072] In step S3, the reference auxiliary line is a parallel line connecting a pair of relatively set eddy current sensors 006. Step S3 specifically includes: making parallel lines of a pair of relatively set eddy current sensors 006 through the midpoint in sequence to obtain two parallel lines; wherein the midpoint of the line connecting point A and point B is set as point E, the midpoint of the line connecting point C and point D is set as point F, a parallel line CD is made through point E, a parallel line AB is made through point F, and the intersection of the two parallel lines is point G, which is the center point of the outer jacket of the wire drawing die 003.

[0073] When establishing a plane rectangular coordinate system, the position coordinates of the center points of the probe coils of the four eddy current sensors 006 have been confirmed, that is, the coordinate positions of the four points A, B, C, and D are fixed. In step S2, the position coordinates of the two midpoints E and F can be calculated based on the position coordinates of the eddy current sensor 006, and then a parametric equation can be established based on the two parallel lines to solve the position coordinates of point G where the two parallel lines intersect, which is the position coordinates of the center point of the outer jacket of the drawing die 003.

[0074] In this embodiment, the center point position of the outer jacket of the drawing die 003 can be accurately determined by drawing parallel lines through the midpoint and finding the intersection point. Through the automated measurement and calculation process, the center point position coordinates of the outer jacket of the drawing die 003 can be quickly obtained, thereby improving measurement efficiency and shortening the measurement cycle. There is no need to use complex measuring equipment and tools, and only the eddy current sensor 006 is needed to achieve high-precision measurement, thereby reducing measurement costs.

[0075] In step S5, since the coordinate origins of the electromagnetic induction measurement system and the optical measurement system are initially calibrated and associated, the center point of the outer shell of the drawing die 003 measured by the electromagnetic induction measurement system and the center point of the die hole of the drawing die 003 measured by the optical measurement system are located in the same coordinate system. Point H is defined as the center point of the die hole of the drawing die 003, and the coordinate origin is the intersection of the centers of the probe coils of the four eddy current sensors 006. Therefore, in the same coordinate system, the formula for calculating the concentricity of the drawing die 003 is:

[0076]

[0077] Where, is the horizontal coordinate of point H, is the horizontal coordinate of point G, is the ordinate of point H, is the vertical coordinate of point G.

[0078] In this embodiment, by calibrating the origin of the coordinate system of the electromagnetic induction measurement system and the optical measurement system, it is possible to ensure that the two measurement systems are measured in the same coordinate system, thereby directly using the formula to calculate the concentricity of the drawing die 003 in the same coordinate system without the need for complex coordinate conversion or data correction, thereby simplifying the calculation process and improving work efficiency; the concentricity of the drawing die 003 with a smaller die hole can be measured, the measurement operation is simple, and it can be used for batch automated measurement.

[0079] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A wire drawing die concentricity measuring device, characterized in that: include: A main frame structure (005) and a light source lens (001), an electromagnetic induction measurement platform (002) and a measurement lens (004) arranged on the main frame structure (005); a wire drawing die (003) to be measured is placed on the electromagnetic induction measurement platform (002); the electromagnetic induction measurement platform (002) is used to carry the wire drawing die (003) and measure the position coordinates of the center point of the outer jacket of the wire drawing die (003); The measuring lens (004), the electromagnetic induction measuring platform (002) and the light source lens (001) are arranged in order from high to low. The light source lens (001) is used to emit a light spot, and the light spot enters the measuring lens (004) through the die hole of the drawing die (003) located on the electromagnetic induction measuring platform (002). The measuring lens (004) is used to amplify the light spot and form an image in the image sensor on the measuring lens (004). The position coordinates of the center point of the die hole of the drawing die (003) are measured by the measuring lens (004), the electromagnetic induction measuring platform (002) and the light source lens (001); the measuring lens (004) measures the coordinates of the center point of the die hole of the drawing die (003) by using lens barrels with different magnifications. The electromagnetic induction measurement platform (002) comprises: a mold carrier (008), a sensor fixing bracket (007) and a sensor, wherein four sensors are respectively arranged along the diagonal lines on the mold carrier (008), and two sensors arranged along the same diagonal line are arranged opposite to each other, and the angle between adjacent sensors is 90°. The sensor is installed on the mold carrier (008) through the sensor fixing bracket (007), and the position coordinates of the probe on the sensor to the center point of the outer shell of the drawing die (003) are collected by the sensor, so that the concentricity of the drawing die (003) is calculated based on the position coordinates of the center point of the outer shell of the drawing die (003) and the position coordinates of the center point of the die hole of the drawing die (003).

2. A wire drawing die concentricity measuring device according to claim 1, characterized in that: The sensor is an eddy current sensor (006).

3. A wire drawing die concentricity measuring device according to claim 2, characterized in that: The die carrier (008) between the eddy current sensors (006) is used to place the wire drawing die (003); The sensor fixing bracket (007) drives the eddy current sensor (006) to move closer to or away from the wire drawing die (003).

4. A method for measuring the concentricity of a wire drawing die, characterized in that: Using the wire drawing die concentricity measuring device according to claim 2 or 3, the wire drawing die concentricity measuring method includes: Placing the wire drawing die (003) on an electromagnetic induction measurement platform (002), and measuring the distance from the outer surface of the wire drawing die (003) by using an eddy current sensor (006); Calculating the position coordinates of the midpoint between a pair of eddy current sensors (006) based on the position coordinates of the center point of each eddy current sensor (006) to obtain the position coordinates of the two midpoints; Reference auxiliary lines are drawn through the midpoints in sequence, and the position coordinates of the intersection of the two reference auxiliary lines are calculated based on the position coordinates of the two midpoints, and the intersection is the center point of the jacket of the drawing die (003); the reference auxiliary lines are parallel lines connecting a pair of eddy current sensors (006) arranged oppositely; the reference auxiliary lines are drawn through the midpoints in sequence, and the position coordinates of the intersection of the two reference auxiliary lines are calculated based on the position coordinates of the two midpoints, and the intersection is the center point of the jacket of the drawing die (003) comprises: drawing parallel lines of a pair of eddy current sensors (006) arranged oppositely through the midpoints in sequence to obtain two parallel lines; determining the midpoint of the two parallel lines, and the intersection of a parallel line passing through the midpoint of the two parallel lines and a connecting line of an adjacent eddy current sensor (006) is the center point of the jacket of the drawing die (003); A light source lens (001) emits a light spot, and the light spot is imaged in a measuring lens (004) through the die hole of the drawing die (003). The center point of the image is the center point of the die hole of the drawing die (003), and the position coordinates of the center point of the die hole of the drawing die (003) are calculated; the measuring lens (004) measures the coordinates of the center point of the die hole of the drawing die (003) by using lens barrels with different magnifications; The concentricity of the wire drawing die (003) is calculated based on the position coordinates of the center point of the outer shell of the wire drawing die (003) and the position coordinates of the center point of the die hole of the wire drawing die (003).

5. A method for measuring the concentricity of a wire drawing die according to claim 4, characterized in that: Before placing the wire drawing die (003), it is also necessary to establish a plane rectangular coordinate system about the electromagnetic induction measurement platform (002) to determine the position coordinates of the center point of each eddy current sensor (006).

6. A method for measuring the concentricity of a wire drawing die according to claim 5, characterized in that: Before establishing the plane rectangular coordinate system, the origin of the coordinate system needs to be calibrated. The calibration method of the origin of the coordinate system includes: Place the calibration rod end face upward into the electromagnetic induction measurement platform (002) until an image is formed in the image sensor of the measurement lens (004), and calculate the position coordinates of the imaging center point; Measuring the distance from the outer surface of the calibration measuring rod by the eddy current sensor (006), and calculating the position coordinates of the midpoint of the end surface of the calibration measuring rod based on the measured values; An offset calculation result is obtained based on the position coordinates of the midpoint of the end face of the calibration measuring rod and the position of the coordinate system origin of the electromagnetic induction measurement system. In the optical measurement system, the coordinate system origin of the optical measurement system is obtained according to the offset calculation result and the position coordinates of the imaging center point, thereby completing the calibration of the coordinate system origin.

7. A method for measuring the concentricity of a wire drawing die according to claim 4, characterized in that: In the step of placing the wire drawing die (003) on the electromagnetic induction measurement platform (002) and measuring the distance value from the outer surface of the wire drawing die (003) by using an eddy current sensor (006): The wire drawing die (003) is placed between the four eddy current sensors (006) on the electromagnetic induction measurement platform (002), the wire drawing die (003) is spaced apart from each of the eddy current sensors (006), and the distance value between the center point of each of the eddy current sensors (006) and the outer surface of the wire drawing die (003) is measured.

8. A method for measuring the concentricity of a wire drawing die according to claim 4, characterized in that: The steps of drawing reference auxiliary lines through the midpoints in sequence, and calculating the position coordinates of the intersection of the two reference auxiliary lines based on the position coordinates of the two midpoints, wherein the intersection is the center point of the outer sleeve of the wire drawing die (003) comprises: A pair of parallel lines of the eddy current sensors (006) arranged opposite to each other are sequentially drawn through the midpoint to obtain two parallel lines; The position coordinates of the intersection point of the two parallel lines are calculated based on the position coordinates of the two midpoints.

9. A method for measuring the concentricity of a wire drawing die according to claim 4, characterized in that: The calculation formula of the concentricity of the wire drawing die (003) is: Where, is the horizontal coordinate of the center point of the die hole of the drawing die (003), is the horizontal coordinate of the center point of the outer jacket of the drawing die (003), is the ordinate of the center point of the die hole of the drawing die (003), is the ordinate of the center point of the outer jacket of the drawing die (003).

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