A method for aligning the origin of product coordinates

Abstract

The present invention discloses a method for aligning the origin of a product coordinate, which specifically relates to the field of machine tool measurement. First, a communication protocol is established between the numerical control system and the CCD system of the machine tool to ensure that the two can normally collaborate for measurement, and to ensure that the two can normally communicate and work together. The refraction auxiliary part and the product to be measured are installed on the machine tool. Through the CCD system, the distance between the center of the spindle and the center of the CCD camera is determined, and a light source is used to vertically illuminate the product. The light is refracted through the product and the refraction auxiliary part by using the principle of light refraction, and then refracted to the top plane of the refraction auxiliary part. The present invention establishes a communication protocol between the numerical control system and the CCD system of the machine tool, and uses the principle of light refraction to measure the origin of the coordinate of the product by projection, and feeds the data back to the machine tool for positioning processing, thereby ensuring the position accuracy of the processing structure and the positioning reference.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool measurement, and more specifically, to a method for aligning a product coordinate origin. Background Art

[0002] With the advancement of manufacturing technology, especially the rapid development of injection molding and optical product manufacturing technology, the appearance design and functional requirements of industrial products have become more and more complex. Modern products often have more delicate appearances. Many injection molded products have smooth and regular surfaces with small height differences. Traditional measurement equipment has limited applicability in these aspects.

[0003] At present, when processing products through machine tools, the product yield is improved. Before processing, the coordinate origin of the product will be measured with equipment such as probes or edge finders to ensure the position accuracy of each product. However, traditional measuring equipment (such as probes and edge finders) is designed based on the principle of contact measurement. This measurement method can meet the basic needs of the market at the beginning of the technology. However, with the diversification of application scenarios, especially in high-precision and high-requirement industrial applications, and for injection molding products and optical products without height difference, these devices usually require the measured object to have a certain height difference so that the probe can accurately locate the coordinate origin of the product. If the product is completely flat (such as injection molding products without height difference), the probe cannot effectively contact or sense its surface, resulting in measurement failure. In addition, for some refractive positioning optical products, the surface of the product may be transparent or reflective, which may make the probe unable to establish stable contact or generate accurate feedback signals during measurement, thereby affecting the measurement results. There are certain limitations, which can easily lead to inaccurate measurement results or inability to measure. Summary of the invention

[0004] The present invention provides a method for aligning the origin of a product coordinate, and aims to solve the problem that the existing method of obtaining the origin of a product coordinate by contact measurement has certain limitations, which easily leads to inaccurate measurement results or makes it impossible to measure.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for aligning the origin of a product coordinate, a method for aligning the origin of a product coordinate, comprising the following steps:

[0006] Step 1: First, establish a communication protocol between the CNC system of the machine tool and the CCD system to ensure that the two can work together normally for measurement and ensure that the two can communicate and work together normally;

[0007] Step 2: Install the refraction auxiliary parts and the product to be measured on the machine tool;

[0008] Step 3: Determine the distance between the spindle center and the CCD camera center through the CCD system;

[0009] Step 4: Use a light source to illuminate the product vertically, and use the principle of light refraction to refract the light through the product and the refraction auxiliary component to the 45-degree refraction surface of the refraction auxiliary component, and then refract it to the top plane of the refraction auxiliary component;

[0010] Step 5: The CCD camera captures the refracted image, including the projection of the product, and uses these image data to analyze the coordinate origin of the product;

[0011] Step 6: Based on the captured image data, use a computing algorithm to analyze and determine the coordinate origin of the product.

[0012] In a preferred embodiment, in step 2, it is necessary to ensure that the refractive auxiliary component is aligned with the CCD camera in the vertical direction, and ensure that the shooting end of the CCD camera is perpendicular to the top plane of the refractive auxiliary component, and the product is attached to the side of the refractive auxiliary component.

[0013] In a preferred embodiment, it includes a clamping mechanism, which is used to clamp and position the refractive auxiliary component. The clamping mechanism includes a base, which is fixedly installed on a machine tool. A power component 1 is fixedly installed on the base. A fixing bar is installed at the output end of the power component 1. Two hinged rods are hinged on the fixing bar. The ends of the two hinged rods away from the fixing bar are hinged with sliders, and the ends of the two sliders are installed with connecting plates.

[0014] In a preferred embodiment, a cross bar is fixedly arranged on the base, and the two sliding blocks are slidably arranged on the cross bar.

[0015] In a preferred embodiment, an angle adjustment mechanism is provided on the connecting plate, the angle adjustment mechanism includes a power component 2, the power component 2 is installed on the connecting plate, and the output end of the power component 2 is connected to a chuck, the angle adjustment mechanism includes two groups, the two groups of angle adjustment mechanisms are respectively provided on corresponding connecting plates, the two chucks are located between the two connecting plates, and the two chucks are aligned in the horizontal direction.

[0016] In a preferred embodiment, the machine tool is also provided with a vertical adjustment mechanism, which is used to drive the vertical adjustment of the light source. The vertical adjustment mechanism includes a power component three, which is fixedly installed on the machine tool. A connecting seat is installed at the output end of the power component three, and the light source is installed in the connecting seat.

[0017] In a preferred embodiment, a positioning mechanism is also provided on the machine tool, and the positioning mechanism is used to fix the product on the side of the refractive auxiliary component. The positioning mechanism includes a power component four, and the power component four is installed on the machine tool. A positioning plate is installed at the output end of the power component four, and a positioning hole is opened on the positioning plate. The positioning plate positions the product by abutting the positioning hole.

[0018] In a preferred embodiment, a circular groove is formed on one side of the positioning plate, the circular groove is communicated with the positioning hole, and a protective member is fixedly disposed in the circular groove.

[0019] In a preferred embodiment, a connecting mechanism is arranged between the connecting seat and the positioning plate, the connecting mechanism includes a fixing plate and a fixing rod, the fixing plate is fixedly arranged on the connecting seat, the fixing rod is fixedly arranged on the positioning plate, the fixing rod is slidably arranged in the fixing plate, and the positioning mechanism also includes a fixing seat, the fixing seat is installed at the output end of the power component four, and the positioning plate is slidably arranged in the fixing seat.

[0020] In a preferred embodiment, the machine tool is provided with a linear drive component one, a linear drive component two and a linear drive component three, the linear drive component two is installed at the output end of the linear drive component one, the linear drive component three is installed at the output end of the linear drive component two, the spindle is installed at the output end of the linear drive component three, and the linear drive component one, the linear drive component two and the linear drive component three constitute a three-axis moving mechanism.

[0021] The beneficial effects of the present invention are:

[0022] The present invention establishes a communication protocol between the numerical control system and the CCD system of the machine tool, and uses the principle of light refraction to measure the coordinate origin of the product by projection, and then feeds the data back to the machine tool for positioning processing, thereby ensuring the position accuracy of the processing structure and the positioning reference. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a flow chart of the method of the present invention.

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention.

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the product of the present invention and the refractive auxiliary component.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the clamping mechanism and the angle adjustment mechanism of the present invention.

[0027] Figure 5 It is a three-dimensional structural schematic diagram of the vertical adjustment mechanism, positioning mechanism and connecting mechanism of the present invention.

[0028] Figure 6It is a schematic diagram of the cross-sectional structure of the positioning plate of the present invention.

[0029] Figure 7 Schematic diagram of the light refraction route of the present invention.

[0030] The accompanying drawings are marked as follows: 1. machine tool; 11. spindle; 12. linear drive component one; 13. linear drive component two; 14. linear drive component three; 2. CCD system; 21. CCD camera; 22. light source; 3. refraction auxiliary part; 4. product; 5. clamping mechanism; 51. base; 52. power component one; 53. fixing bar; 54. hinged rod; 55. slider; 56. cross bar; 57. connecting plate; 6. angle adjustment mechanism; 61. power component two; 62. chuck; 7. vertical adjustment mechanism; 71. power component three; 72. connecting seat; 8. positioning mechanism; 81. power component four; 82. positioning plate; 83. positioning hole; 831. circular groove; 832. protective part; 84. fixing seat; 9. connecting mechanism; 91. fixing plate; 92. fixing rod. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0032] Refer to the instruction manual Figures 1 to 7 , a method for aligning the origin of a product coordinate comprises the following steps:

[0033] Step 1: First, establish a communication protocol between the numerical control system of the machine tool 1 and the CCD system 2 to ensure that the two can normally collaborate to perform measurements and ensure that the two can communicate and work together normally;

[0034] Step 2: Install the refraction auxiliary component 3 and the product 4 to be measured on the machine tool 1;

[0035] Step 3: Determine the distance between the center of the spindle 11 and the center of the CCD camera 21 through the CCD system 2, in preparation for finding the coordinate origin of the product 4;

[0036] Step 4: Use the light source 22 to vertically illuminate the product 4, and use the principle of light refraction to refract the light through the product 4 and the refraction auxiliary component 3 to the 45-degree refraction surface of the refraction auxiliary component 3, and then refract to the top plane of the refraction auxiliary component 3;

[0037] Step 5: The CCD camera 21 captures the refracted image, including the projection of the product 4, and analyzes the coordinate origin of the product 4 through these image data;

[0038] Step 6: Based on the captured image data, use a computing algorithm to analyze and determine the coordinate origin of the product 4.

[0039] It should be noted that both the product 4 and the refraction auxiliary component 3 are transparent. Refraction is the phenomenon that the propagation direction of light changes when it propagates from one medium to another. This phenomenon follows Snell's law, and its formula is:

[0040] n1sin(θ1)=n2sin(θ2)

[0041] in:

[0042] n1 and n2 are the refractive indices of the two media respectively.

[0043] θ1 is the angle of incidence (the angle at which the light rays from the first medium enter the second medium)

[0044] θ2 is the angle of refraction (the angle at which the light travels in the second medium)

[0045] Vertical irradiation: The light source 22 irradiates the product 4 in a vertical direction. The product 4 is an optical lens, and thus refracts the incident light differently.

[0046] Refraction of incident light: When light enters product 4, the direction of the light changes due to the different refractive indices. Depending on the shape of product 4, the light will produce different refraction paths inside the transparent material;

[0047] Internal refraction and light propagation: Inside the product 4, the light will continue to propagate and may diverge or focus due to the geometric shape of the product 4. For example, if the product 4 is a convex lens, the light will diverge outwards, and if it is a concave lens, the light will focus;

[0048] Projection onto the refractive surface: The light continues along its refractive path and eventually contacts a refractive surface set at a 45-degree angle. Here, the light is refracted again. Due to the previous refraction and the influence of the shape of product 4, the final propagation direction of the light has been changed.

[0049] Refraction to the processing surface: According to Snell's law, the light is refracted after reaching the 45-degree refraction surface, generating a new propagation direction and projected onto the top plane of the refraction auxiliary member 3. At this time, the light refracted twice can be a virtual shadow distributed in a larger area, or form a clear light spot;

[0050] Feature extraction and coordinate calculation: The CCD camera 21 can capture the image of the light projection (for example, a virtual shadow or a light spot), and by analyzing the positions of these light spots, combined with the geometric shape and refractive characteristics of the product 4, the coordinates of the product 4 can be calculated.

[0051] In step 2, it is necessary to ensure that the refraction auxiliary component 3 is aligned with the CCD camera 21 in the vertical direction, and ensure that the shooting end of the CCD camera 21 is perpendicular to the top plane of the refraction auxiliary component 3, and the product 4 is attached to the side of the refraction auxiliary component 3.

[0052] It should be noted that by ensuring that the refractive auxiliary component 3 is aligned with the CCD camera 21 in the vertical direction and ensuring that the shooting end of the CCD camera 21 is perpendicular to the top plane of the refractive auxiliary component 3, the measurement error light can be reduced to avoid the light path obtained during measurement being inconsistent with the actual path, thereby causing problems affecting the accuracy of coordinate positioning.

[0053] For further information, please refer to the attached manual. Figure 4 The clamping mechanism 5 is used to clamp and position the refractive auxiliary component 3. The clamping mechanism 5 includes a base 51, which is fixedly installed on the machine tool 1. A power component 52 is fixedly installed on the base 51. A fixing bar 53 is installed on the output end of the power component 52. Two hinged rods 54 are hinged on the fixing bar 53. The two hinged rods 54 are hinged at one end away from the fixing bar 53. Connecting plates 57 are installed at the ends of the two sliders 55. A cross bar 56 is fixedly set on the base 51, and the two sliders 55 are slidably set on the cross bar 56.

[0054] It should be noted that the power component 1 52 is a motor, which drives the fixing bar 53 to rotate. When the fixing bar 53 rotates, the two sliding blocks 55 are driven to move closer to each other through the two hinge rods 54 to clamp and fix the refraction auxiliary component 3.

[0055] For further information, please refer to the attached manual. Figure 4 An angle adjustment mechanism 6 is provided on the connecting plate 57, and the angle adjustment mechanism 6 includes a power component 2 61, and the power component 2 61 is installed on the connecting plate 57, and the output end of the power component 2 61 is connected to a chuck 62, and the angle adjustment mechanism 6 includes two groups, and the two groups of angle adjustment mechanisms 6 are respectively arranged on the corresponding connecting plates 57, and the two chucks 62 are located between the two connecting plates 57, and the two chucks 62 are aligned in the horizontal direction.

[0056] It should be noted that the second power component 61 is a motor. When the clamping mechanism 5 drives to clamp the refractive auxiliary component 3, the refractive auxiliary component 3 can be clamped and fixed by the two chucks 62. If the top plane of the refractive auxiliary component 3 and the shooting end of the CCD camera 21 are not in a vertical state at this time, the two motors can be driven at the same time to make the two chucks 62 drive the refractive auxiliary component 3 to rotate and adjust the angle, so that the top plane of the refractive auxiliary component 3 and the shooting end of the CCD camera 21 can be adjusted to a vertical state.

[0057] For further information, please refer to the attached manual. Figure 5The machine tool 1 is also provided with a vertical adjustment mechanism 7, which is used to drive the light source 22 to adjust vertically. The vertical adjustment mechanism 7 includes a power component 3 71, and the power component 3 71 is fixedly installed on the machine tool 1. A connecting seat 72 is installed at the output end of the power component 3 71, and the light source 22 is installed in the connecting seat 72.

[0058] It should be noted that the power component three 71 is a cylinder, and the light source 22 is an irradiation lamp. The cylinder can drive the light source 22 to move vertically to adjust the height of the light source 22 so that the light source 22 can vertically irradiate the product 4.

[0059] For further information, please refer to the attached manual. Figure 5 The machine tool 1 is also provided with a positioning mechanism 8, which is used to fix the product 4 on the side of the refraction auxiliary component 3. The positioning mechanism 8 includes a power component 4 81, which is installed on the machine tool 1, and a positioning plate 82 is installed at the output end of the power component 4 81. A positioning hole 83 is opened on the positioning plate 82, and the positioning plate 82 abuts and positions the product 4 through the positioning hole 83.

[0060] It should be noted that the power component 81 is a cylinder. When installing the positioning product 4, the product 4 can be first attached to the side of the refractive auxiliary component 3, and then the positioning plate 82 is driven by the cylinder to move in the direction close to the product 4, so that the positioning plate 82 is fixed to the product 4 through the positioning hole 83.

[0061] For further information, please refer to the attached manual. Figure 6 A circular groove 831 is formed on one side of the positioning plate 82 . The circular groove 831 is communicated with the positioning hole 83 , and a protective member 832 is fixedly disposed in the circular groove 831 .

[0062] It should be noted that the protective member 832 is a rubber pad. Since the positioning plate 82 fixes the product 4 through the positioning hole 83, in order to avoid damage to the product 4 when positioning the product 4, a circular groove 831 connected to the positioning hole 83 is opened on the positioning plate 82, and a rubber pad is arranged in the circular groove 831, so that the product 4 can be protected when positioned and damage to the product 4 can be avoided during positioning.

[0063] For further information, please refer to the attached manual. Figure 4 A connecting mechanism 9 is arranged between the connecting seat 72 and the positioning plate 82, and the connecting mechanism 9 includes a fixing plate 91 and a fixing rod 92, the fixing plate 91 is fixedly arranged on the connecting seat 72, the fixing rod 92 is fixedly arranged on the positioning plate 82, the fixing rod 92 is slidably arranged in the fixing plate 91, and the positioning mechanism 8 also includes a fixing seat 84, the fixing seat 84 is installed at the output end of the power component four 81, and the positioning plate 82 is slidably arranged in the fixing seat 84.

[0064] It should be noted that the emitting end of the light source 22 is aligned with the center position of the positioning hole 83 in the horizontal direction. By setting a connecting mechanism 9 composed of a fixing plate 91 and a fixing rod 92, when the product 4 is installed, the light source 22 can be driven by the power component three 71 to adjust the brightness, and the height of the positioning plate 82 can be adjusted, so that when the product 4 is positioned and adjusted by the positioning mechanism 8, the height of the light source 22 can be adjusted by the vertical adjustment mechanism 7 at the same time, and after adjustment, the emitting end of the light source 22 is in a vertical state with the product 4.

[0065] For further information, please refer to the attached manual. Figure 2 The machine tool 1 is provided with a linear drive component 12, a linear drive component 2 13 and a linear drive component 3 14. The linear drive component 2 13 is installed at the output end of the linear drive component 12, the linear drive component 3 14 is installed at the output end of the linear drive component 2 13, the spindle 11 is installed at the output end of the linear drive component 3 14, and the linear drive component 1 12, the linear drive component 2 13 and the linear drive component 3 14 constitute a three-axis moving mechanism.

[0066] It should be noted that the linear drive assembly 1 12 , the linear drive assembly 2 13 and the linear drive assembly 3 14 can all adopt a screw-nut device, and the three-axis moving mechanism formed by them can conveniently adjust the position of the main shaft 11 and the CCD camera 21.

[0067] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A device for aligning the origin of a product coordinate, used in the following alignment method: Step 1, firstly, establishing a communication protocol between a numerical control system of a machine tool (1) and a CCD system (2) to ensure that the two can normally collaborate to perform measurement and ensure that the two can normally communicate and work together; Step 2: Install the refraction auxiliary component (3) and the product to be measured (4) on the machine tool (1); Step 3: Determine the distance between the center of the spindle (11) and the center of the CCD camera (21) through the CCD system (2); Step 4: Use the light source (22) to vertically illuminate the product (4), and utilize the principle of light refraction to refract the light through the product (4) and the refraction auxiliary component (3) to the 45-degree refraction surface of the refraction auxiliary component (3), and then refract to the top plane of the refraction auxiliary component (3); Step 5: The CCD camera (21) captures the refracted image, including the projection of the product (4), and uses the image data to analyze the coordinate origin of the product (4); Step 6: Analyze and determine the coordinate origin of the product (4) using a computing algorithm based on the captured image data; in step 2, ensure that the refractive auxiliary component (3) is aligned with the CCD camera (21) in the vertical direction, ensure that the shooting end of the CCD camera (21) is perpendicular to the top plane of the refractive auxiliary component (3), and ensure that the product (4) is attached to the side of the refractive auxiliary component (3). Features: The alignment device comprises a clamping mechanism (5), the clamping mechanism (5) being used to clamp and position the refraction auxiliary component (3), the clamping mechanism (5) comprising a base (51), the base (51) being fixedly mounted on the machine tool (1), a power component 1 (52) being fixedly mounted on the base (51), a fixing bar (53) being mounted on the output end of the power component 1 (52), two hinged rods (54) being hinged on the fixing bar (53), a slider (55) being hinged on one end of the two hinged rods (54) away from the fixing bar (53), and a connecting plate (57) being mounted on the ends of the two sliders (55).

2. The device for aligning the origin of product coordinates according to claim 1, characterized in that: A crossbar (56) is fixedly disposed on the base (51), and the two sliders (55) are both slidably disposed on the crossbar (56).

3. The device for locating the origin of product coordinates according to claim 2, characterized in that: The connecting plate (57) is provided with an angle adjustment mechanism (6), the angle adjustment mechanism (6) comprising a second power component (61), the second power component (61) being mounted on the connecting plate (57), and an output end of the second power component (61) being connected to a chuck (62), the angle adjustment mechanism (6) comprising two groups, the two groups of angle adjustment mechanisms (6) being respectively arranged on corresponding connecting plates (57), the two chucks (62) being located between the two connecting plates (57), and the two chucks (62) being aligned in a horizontal direction.

4. The device for aligning the origin of product coordinates according to claim 3, characterized in that: The machine tool (1) is also provided with a vertical adjustment mechanism (7), the vertical adjustment mechanism (7) being used to drive the light source (22) to adjust vertically, the vertical adjustment mechanism (7) comprising a power component three (71), the power component three (71) being fixedly mounted on the machine tool (1), a connecting seat (72) being mounted at the output end of the power component three (71), and the light source (22) being mounted in the connecting seat (72).

5. The device for aligning the origin of product coordinates according to claim 4, characterized in that: The machine tool (1) is further provided with a positioning mechanism (8), the positioning mechanism (8) being used to fix the product (4) on the side of the refraction auxiliary component (3), the positioning mechanism (8) comprising a power component four (81), the power component four (81) being mounted on the machine tool (1), and a positioning plate (82) being mounted on the output end of the power component four (81), the positioning plate (82) being provided with a positioning hole (83), and the positioning plate (82) abuts against the product (4) through the positioning hole (83) to position the product (4).

6. The device for aligning the origin of product coordinates according to claim 5, characterized in that: A circular groove (831) is provided on one side of the positioning plate (82); the circular groove (831) is communicated with the positioning hole (83), and a protective member (832) is fixedly disposed in the circular groove (831).

7. The device for aligning the origin of product coordinates according to claim 6, characterized in that: A connecting mechanism (9) is provided between the connecting seat (72) and the positioning plate (82), the connecting mechanism (9) comprising a fixing plate (91) and a fixing rod (92), the fixing plate (91) being fixedly arranged on the connecting seat (72), the fixing rod (92) being fixedly arranged on the positioning plate (82), the fixing rod (92) being slidably arranged in the fixing plate (91), and the positioning mechanism (8) further comprising a fixing seat (84), the fixing seat (84) being mounted on the output end of the power component four (81), and the positioning plate (82) being slidably arranged in the fixing seat (84).

8. The device for aligning the origin of product coordinates according to claim 7, characterized in that: The machine tool (1) is provided with a linear drive component 1 (12), a linear drive component 2 (13) and a linear drive component 3 (14); the linear drive component 2 (13) is mounted on the output end of the linear drive component 1 (12); the linear drive component 3 (14) is mounted on the output end of the linear drive component 2 (13); the spindle (11) is mounted on the output end of the linear drive component 3 (14); and the linear drive component 1 (12), the linear drive component 2 (13) and the linear drive component 3 (14) constitute a three-axis moving mechanism.

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