Device and method for measuring concentricity of wire-drawing die

Abstract

The invention relates to a wire-drawing die concentricity measuring device and method, and the device comprises a main frame structure, and a light source lens, an electromagnetic induction measuring platform and a measuring lens which are disposed on the main frame structure, and a to-be-measured wire-drawing die is disposed on the electromagnetic induction measuring platform. The electromagnetic induction measurement platform is used for bearing the wire-drawing die and measuring the position coordinate of the central point of the wire-drawing die jacket; the measuring lens, the electromagnetic induction measuring platform and the light source lens are sequentially arranged from high to low, the light source lens is used for emitting light spots, and the light spots enter the light source lens through a die hole of the wire drawing die located on the electromagnetic induction measuring platform. And the light source lens is used for amplifying the light spot and imaging in an image sensor on the measuring lens. The device has the advantages that the whole device is free of moving parts, the structural strength of the system is high, the measurement precision is guaranteed, and the cost is low.

Description

Technical Field

[0001] The 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 the wire drawing die at home and abroad. With the development of electronic equipment, wire and cable and other industries, the size of the die hole of the wire drawing die is getting smaller and smaller, and the minimum can reach 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 movable brackets, dial indicators, and dial indicator brackets. 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 microscopes. Switching between different optical magnifiers 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 reach less than 20 microns.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: 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, and the electromagnetic induction measuring platform is used to carry the wire drawing die and measure the position coordinates of the center point of the wire drawing die jacket; 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 wire 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.

[0005] The beneficial effects of the present invention are as follows: the main frame structure is used to fix and connect various components, providing an installation foundation for each component, and having higher stability; the electromagnetic induction measurement platform carries the wire drawing die and measures the position coordinates of the center of the wire drawing die jacket; the light source lens is used to emit a light spot, and the measurement lens is used to amplify the light spot and form an image in the image sensor on the measurement lens. The overall device has no moving parts, the system structure has high strength, and the measurement accuracy is guaranteed at a low cost; there is no need to train measurement personnel, and the die can be measured by placing it in the designated area, which is simple to operate. The optical measurement system and the electromagnetic induction system are used in combination to achieve efficient measurement of the concentricity of the wire drawing die.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the electromagnetic induction measurement platform includes: a mold carrier, a sensor fixing bracket and a sensor. Four sensors are arranged along the diagonals on the mold carrier, and two sensors arranged along the same diagonal are arranged opposite to each other. The angle between adjacent sensors is 90°. The sensor is installed on the mold carrier through the sensor fixing bracket.

[0008] The beneficial effects of adopting the above 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, 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 basis for the sensor, making the installation and removal of the sensor simple and quick.

[0009] Furthermore, the sensor is an eddy current sensor.

[0010] 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 an eddy current sensor, and the measurement accuracy is high.

[0011] Furthermore, the die carrier between the eddy current sensors is used to place the wire drawing die; The sensor fixing bracket drives the eddy current sensor to move closer to or away from the wire drawing die.

[0012] The beneficial effects of adopting the above further scheme are: the setting position of the wire drawing die is limited to an adjustable range between the eddy current sensors, which further improves 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 wire drawing dies of different sizes and specifications, thereby improving the versatility and applicability of the measurement.

[0013] A method for measuring the concentricity of a wire drawing die is also disclosed. Using the above-mentioned device for measuring the concentricity of a wire drawing die, the method for measuring the concentricity of a wire drawing die includes: The wire drawing die is placed on an electromagnetic induction measurement platform, and the distance value from the outer surface of the wire drawing die is measured by an eddy current sensor; Calculate 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; 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; The light source lens emits a light spot, and the light spot is imaged in the measuring lens through the die hole of the wire drawing die, the center point of the image is the center point of the die hole of the wire drawing die, and the position coordinates of the center point of the die hole of the wire drawing die are calculated; 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.

[0014] 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. The application in the field of wire drawing die measurement has well solved the shortcomings of the prior art; it can realize the measurement of the concentricity of wire drawing dies with smaller die holes, and 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 up to ±1.5 microns, the measurement operation is simple, and it can be used for batch automated measurement.

[0015] Furthermore, before placing the wire drawing die, it is also necessary to establish a plane rectangular coordinate system about the electromagnetic induction measurement platform to determine the position coordinates of the center point of each eddy current sensor.

[0016] 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 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. Furthermore, before establishing the plane rectangular coordinate system, the origin of the coordinate system needs to be calibrated, and the calibration method of the origin of the coordinate system includes: Place the calibration measuring rod with the end face facing upward into the electromagnetic induction measuring platform until an image is formed in the image sensor of the measuring lens, and calculate the position coordinates of the imaging center point; Using the eddy current sensor to measure the distance from the outer surface of the calibration measuring rod, respectively, and calculating the position coordinates of the midpoint of the end surface of the calibration measuring rod based on the measurement values; 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 origin of the coordinate system 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 origin of the coordinate system.

[0017] The beneficial effects of adopting the above further scheme are: by calibrating the origin of the coordinate system, the electromagnetic induction measurement system and the optical measurement system can be associated, thereby eliminating the measurement error caused by the deviation between the systems, and ensuring the objectivity and accuracy of the subsequent measurement results; this method combines the advantages of electromagnetic induction measurement and optical measurement, and the two measurement systems cooperate to measure the concentricity of the wire drawing die. Through regular calibration and verification, it can be ensured that the measurement device maintains high accuracy and reliability for a long time.

[0018] Further, in the step of placing the wire drawing die into an electromagnetic induction measurement platform and measuring the distance value from the outer surface of the wire drawing die by an eddy current sensor: 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 value between the center point of each eddy current sensor and the outer surface of the wire drawing die is measured.

[0019] 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 steps 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 the 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 the economic benefits.

[0020] Further, the step of drawing reference auxiliary lines through the midpoints in sequence, 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, comprises: 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; The position coordinates of the intersection point of the two parallel lines are calculated based on the position coordinates of the two midpoints.

[0021] The beneficial effect of adopting the above-mentioned further scheme is: by drawing parallel lines through the midpoint and finding the intersection point, the center point position of the wire drawing die jacket can be accurately determined; through the automated measurement and calculation process, the center point position coordinates of the wire 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 measurements, thereby reducing measurement costs.

[0022] Further, the calculation formula of the concentricity of the wire drawing die is: In the formula, 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 wire 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 wire drawing die jacket.

[0023] The beneficial effect of adopting the above further scheme is: by realizing the calibration of 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 wire drawing die can be directly calculated using the formula 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 wire 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

[0024] Figure 1A schematic diagram of the overall structure of a measuring device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an electromagnetic induction measurement platform in one embodiment of the present invention; Figure 3 A schematic diagram of a process for measuring the concentricity of a wire drawing die according to an embodiment of the present invention; Figure 4 Schematic diagram of measuring the center point of the wire drawing die jacket in one embodiment of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 001, light source lens; 002, electromagnetic induction measurement platform; 003, wire drawing die; 004, measurement lens; 005, main frame structure; 006, eddy current sensor; 007, sensor fixing bracket; 008, mold carrier. DETAILED DESCRIPTION

[0026] 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.

[0027] In the first aspect, the present invention discloses a wire drawing die concentricity measuring device, comprising: a main frame structure 005, and a measuring lens 004, an electromagnetic induction measuring platform 002, and a light source lens 001 arranged on the main frame structure 005, wherein the measuring lens 004, the electromagnetic induction measuring platform 002, and the light source lens 001 are arranged in sequence from high to low, and it can be imagined that the light source lens 001, the electromagnetic induction measuring platform 002, and the measuring lens 004 are sequentially installed on the main frame structure 005 through their respective mounting brackets. In the specific measurement process, the wire drawing die 003 to be measured is placed on the electromagnetic induction measuring platform 002, and the distance of the measuring lens 004 relative to the wire drawing die 003 is adjustable, so that the 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 magnified by the measuring lens 004, and is imaged in the image sensor, wherein the image sensor is provided on the measuring lens 004, and is arranged at the end of the measuring lens 004 away from the wire drawing die 003.

[0028] In this embodiment, the main frame structure 005 is used to fix and connect various components, providing an installation foundation for each component, and having higher stability; the electromagnetic induction measurement platform 002 carries the wire drawing die 003 and measures the position coordinates of the center of the outer jacket of the wire drawing die 003; the light source lens 001 is used to emit a light spot, and 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 overall device has no moving parts, the system structure is strong, the measurement accuracy is guaranteed, and the cost is low; there is no need to train the measurement personnel, and the mold can be placed in the designated area for measurement, which is simple to operate. The optical measurement system and the electromagnetic induction system are used in combination to achieve efficient measurement of the concentricity of the wire drawing die 003.

[0029] like Figure 2 As shown, in the preferred solution, 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 matching preamplifier is not specifically limited. The distance from the probe on the eddy current sensor 006 to the outer jacket of the wire drawing die 003 is collected by the eddy current sensor 006. The mold carrier 008 is roughly rectangular, and a sensor fixing bracket 007 is installed along the 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 sensor 006 is 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.

[0030] 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°.

[0031] In this embodiment, an eddy current sensor 006 is used to accurately collect the distance from the sensor probe to the outer jacket of the wire drawing die 003, and the sensor has a fast response speed, and the measurement result can be calculated in 2-3 seconds, with high measurement efficiency; four sensors are used to measure the distance from the outer jacket of the wire 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 removal of the sensor simple and quick.

[0032] Specifically, the wire drawing die 003 is placed on the die carrier 008 between the four eddy current sensors 006, and the wire drawing die 003 is spaced apart from each eddy current sensor 006, and is not limited to being placed at the center of the four eddy current sensors 006, which further improves the measurement efficiency. At the same time, the sensor fixing bracket 007 can drive the eddy current sensor 006 to move closer to or away from the wire drawing die 003, and the distance can be adjusted, so that the electromagnetic induction measurement platform 002 can adaptably adjust the position of the eddy current sensor 006 according to the wire drawing die 003 of different sizes and specifications, thereby improving the versatility and applicability of the measurement.

[0033] Second, as Figure 3 , Figure 4 As shown, the present invention also discloses a method for measuring the concentricity of a wire drawing die, using the above-mentioned device for measuring the concentricity of a wire drawing die, specifically comprising the following steps: S1: 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 the eddy current sensor 006; 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; S3: Make reference auxiliary lines through the midpoints respectively, 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; S4: The light source lens 001 emits a light spot, which passes through the die hole of the wire 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 wire drawing die 003, and the position coordinates of the center point of the die hole of the wire drawing die 003 are calculated.

[0034] In step S4: an externally connected movable 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 matched with lens barrels of different magnifications (such as 20 times, 10 times, etc.) to achieve the measurement of the coordinates of the center point of the die hole of the wire drawing die 003.

[0035] S5: Calculate the concentricity of the wire drawing die 003 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.

[0036] In this embodiment, an eddy current sensor 006 is used, so that the coordinate position of the center of the outer sleeve 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 mold hole to obtain the coordinate position of the center of the mold 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. It is applied to the measurement field of wire drawing die 003 and solves the shortcomings of the prior art.

[0037] 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.

[0038] In a further solution, before placing the wire drawing die 003 on the electromagnetic induction measuring platform 002, it is also necessary to establish a plane rectangular coordinate system about the electromagnetic induction measuring 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 perpendicularly to each other on the measuring platform, and a plane rectangular coordinate system is established about the electromagnetic induction measuring platform 002, wherein the origin of the coordinate is the center intersection of the probe coils on the four eddy current sensors 006, and each eddy current sensor 006 has an angle of 45° with the coordinate system. It can be imagined that the four eddy current sensors 006 are placed perpendicularly to each other to avoid interference between the two probes through the magnetic field, which may cause distortion of the measurement results.

[0039] In this embodiment, the center points of each eddy current sensor 006 are set to be: point A, point B, point C and point D, and the center point of the eddy current sensor 006 is the center point of the probe coil of the four eddy current sensors 006. By establishing a plane rectangular coordinate system and accurately positioning the center point 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 the measurement deviation caused by human operation or equipment error and improve the accuracy and reliability of the measurement; the four eddy current sensors 006 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.

[0040] 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: 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 measuring lens 004, and identify and calculate the position coordinates of the end face imaging center point. An external mobile device can be connected to calculate the position coordinates of the end face imaging center point.

[0041] Combined with the measurement values ​​of the four eddy current sensors 006, the position coordinates of the midpoint of the end face of the calibration measuring rod are calculated. This step is the same as the method of steps S1-S3. The specific steps are: The measured values ​​of the outer surface of the distance calibration measuring rod are measured respectively by 4 eddy current sensors 006, and the position coordinates of the midpoint of the end face of the calibration measuring rod are calculated based on the measured values; in this step, the setting position of the eddy current sensor 006 in the coordinate system is the same as that in step S1, that is, the position coordinates of each eddy current sensor 006 are also the same, and the coordinate origin of the coordinate system is also the same, that is, the coordinate origin of the electromagnetic induction measurement system. Based on the position coordinates of each eddy current sensor 006, the position coordinates of a pair of relatively arranged eddy current sensors 006 located at the midpoint of the distance are calculated, so as to obtain the position coordinates of the two midpoints. Afterwards, parallel lines corresponding to a pair of eddy current sensors 006 connecting lines are made through the midpoint respectively, and the position coordinates of the intersection of the two parallel lines are calculated based on the position coordinates of the two midpoints, and the position coordinates of the intersection are the position coordinates of the midpoint of the end face of the calibration measuring rod.

[0042] 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 according to 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.

[0043] In this embodiment, by calibrating the origin of the coordinate system, the electromagnetic induction measurement system and the optical measurement system can be associated, thereby eliminating the measurement error caused by the deviation between the systems and ensuring the objectivity and accuracy of the subsequent measurement results; this method combines the advantages of electromagnetic induction measurement and optical measurement, and the two measurement systems cooperate to achieve the measurement of the concentricity of the wire drawing die 003. Through regular calibration and verification, it can be ensured that the measuring device maintains high accuracy and reliability for a long time.

[0044] In step S1, when the wire drawing die 003 is placed on the electromagnetic induction measurement platform 002, the specific setting position on the electromagnetic induction measurement platform 002 is not limited, thereby eliminating the initial positioning step and process time of the wire drawing die 003, which is conducive to improving the measurement efficiency. Specifically, the wire drawing die 003 is placed between the four eddy current sensors 006 on the electromagnetic induction measurement platform 002, and does not contact each eddy current sensor 006.

[0045] When the wire drawing die 003 is placed in the electromagnetic induction measurement platform 002, eddy currents will be excited in the wire 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 in 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 externally connected to the controller, and 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 wire drawing die 003 is set to L1, the distance value between point B and the outer surface of the wire drawing die 003 is set to L2, the distance value between point C and the outer surface of the wire drawing die 003 is set to L3, and the distance value between point D and the outer surface of the wire drawing die 003 is set to L4.

[0046] In this embodiment, the specific setting position of the wire 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 steps and process time. The wire 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 the economic benefits.

[0047] In step S3, the reference auxiliary line is a parallel line of a pair of eddy current sensors 006 that are relatively set. Step S3 specifically includes: making parallel lines of a pair of eddy current sensors 006 that are relatively set 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, the intersection of the two parallel lines is point G, and point G is the center point of the outer jacket of the wire drawing die 003.

[0048] 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 wire drawing die 003.

[0049] 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 the 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 the measurement cost.

[0050] In step S5, since the calibration of the coordinate system origin of the electromagnetic induction measurement system and the optical measurement system is initially realized and associated, based on this, 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, and point H is defined as the center point of the die hole of the drawing die 003. 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: In the formula, 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.

[0051] In this embodiment, 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 wire drawing die 003 can be directly calculated using the formula 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 wire 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.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary 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 light source lens (001) through a die hole of the wire drawing die (003) located on the electromagnetic induction measuring platform (002). The light source lens (001) is used to amplify the light spot and form an image in an image sensor on the measuring lens (004).

2. A wire drawing die concentricity measuring device according to claim 1, characterized in that: The electromagnetic induction measurement platform (002) comprises: a mold carrier (008), a sensor fixing bracket (007) and a sensor. Four sensors are respectively arranged along diagonals on the mold carrier (008). Two sensors arranged along the same diagonal are arranged opposite to each other, and the angle between adjacent sensors is 90°. The sensor is installed on the mold carrier (008) via the sensor fixing bracket (007).

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

4. A wire drawing die concentricity measuring device according to claim 3, 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).

5. A method for measuring the concentricity of a wire drawing die, characterized in that: Using the wire drawing die concentricity measuring device as claimed in claim 3 or 4, the wire drawing die concentricity measuring method comprises: Placing the wire drawing die (003) into an 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); Calculating the position coordinates of the midpoint between a pair of the eddy current sensors (006) based on the position coordinates of the center points of the eddy current sensors (006), and obtaining the position coordinates of the two midpoints; 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 outer sleeve of the wire drawing die (003); The light source lens (001) emits a light spot, and the light spot is imaged in the measuring lens (004) through the die hole of the wire drawing die (003), the center point of the image is the center point of the die hole of the wire drawing die (003), and the position coordinates of the center point of the die hole of the wire drawing die (003) are calculated; The concentricity of the wire drawing die (003) is calculated based on the position coordinates of the center point of the outer sleeve of the wire drawing die (003) and the position coordinates of the center point of the die hole of the wire drawing die (003).

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

7. A method for measuring the concentricity of a wire drawing die according to claim 6, 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 measuring rod with its end facing upward into the electromagnetic induction measuring platform (002) until an image is formed in the image sensor of the measuring lens (004), and calculate the position coordinates of the imaging center point; Using the eddy current sensor (006), respectively measure the measured values ​​of the distance from the outer surface of the calibration measuring rod, and calculate the position coordinates of the midpoint of the end surface of the calibration measuring rod based on the measured values; 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 origin of the coordinate system 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 origin of the coordinate system.

8. A method for measuring the concentricity of a wire drawing die according to claim 5, characterized in that: In the step of placing the wire drawing die (003) on an 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.

9. A method for measuring the concentricity of a wire drawing die according to claim 5, 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.

10. A method for measuring the concentricity of a wire drawing die according to claim 5, characterized in that: The calculation formula of the concentricity of the wire drawing die (003) is: In the formula, is the horizontal coordinate of the center point of the die hole of the wire drawing die 003, is the horizontal coordinate of the center point of the outer jacket of the wire drawing die 003, is the ordinate of the center point of the die hole of the wire drawing die 003, It is the ordinate of the center point of the outer jacket of the wire drawing die 003.

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