Method for designing sheet type of chain sheet of tooth-shaped chain
By measuring the characteristic parameters of the toothed chain plates using 3D coordinate equipment and CAD software, the problems of slow reverse engineering speed and low accuracy were solved, and high-precision chain plate design was achieved.
Patent Information
- Application Number
- CN202511450426.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2026-02-06
AI Technical Summary
Reverse engineering toothed chain plates presents challenges such as slow development speed, difficulty in drawing, and poor dimensional accuracy.
The sample chain plate is scanned using a three-dimensional coordinate device, and various characteristic parameters of the chain plate are measured and drawn using CAD software, such as the radius of the tooth back arc, the center and radius of the upper arc, the tooth angle and the distance between the edges and the center. The shape and position of the waist arc are determined by combining the tangent-tangent-tangent command.
It enables rapid reverse engineering, reduces the difficulty of drawing, improves the dimensional accuracy of the chain plate, and ensures a good fit between the chain plate and the sprocket.
Smart Images
Figure CN121479944A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of chain design technology, specifically relating to a method for designing toothed chain segments. Background Technology
[0002] Chains, as an important component of transmission systems, are widely used due to their high transmission performance, strong load-bearing capacity, and strong environmental adaptability.
[0003] Reverse engineering is a technical process that involves disassembling and analyzing existing products or systems to deduce their design logic, technical implementation, or functional structure. Essentially, it works by working backward from the result, contrasting with traditional forward engineering (a linear process from requirements to implementation). Reverse engineering is widely used in industrial design, software engineering, and product development, and is frequently employed for improving existing designs and conducting infringement analysis.
[0004] In production practice, reverse engineering of toothed chain plates requires fast development speed and high dimensional accuracy of the chain plate shape. However, it also faces the problem of only being able to obtain sample chains, while knowing nothing about other data of the sample chains. This leads to problems such as high difficulty in reverse engineering, difficulty in drawing, low efficiency, and poor dimensional accuracy of the drawn chain plates. Summary of the Invention
[0005] This invention discloses a method for designing toothed chain plates. This method is used for rapid reverse engineering of toothed chain plates, effectively solving the problems of high difficulty in reverse engineering, difficult drawing, low efficiency, and poor accuracy of the drawn chain plate dimensions.
[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A method for designing toothed chain segments includes the following steps: Step 1: Disassemble and obtain the sample chain plate, and scan it using a three-dimensional coordinate device to obtain the CAD shape features of the sample chain plate; Step 2: Obtain the overall dimensions of the sample chain plate using calipers; Step 3: Obtain the radius of the arc on the back of the chain plate teeth using CAD software; Step 4: Obtain the center coordinates and radius of the upper arc of the chain plate using CAD software; Step 5: Measure the tooth angle and center distance of the chain plate using CAD software; Step 6: Obtain the center coordinates and radius of the meshing arc of the chain plate using CAD software; Step 7: Obtain the radius of the tooth tip arc and transition arc of the chain plate using CAD software; Step 8: Obtain the shape, size, and position of the waist arc of the chain plate using CAD software.
[0007] Preferably, step 1 includes: grinding the pins in the chain after riveting with a grinding wheel, placing the chain with the ground pins on a disassembly mold, disassembling it with disassembly pins, taking 5-10 sample chain plates with a gloss band of more than 70%, performing shape scanning using a coordinate measuring machine, and outputting an AutoCAD file .dwg of the sample chain plate shape.
[0008] Preferably, step 2 includes: using calipers to measure the tooth height and tooth width of 5-10 sample chain plates, removing one maximum and one minimum value from the measured data, calculating the average value, retaining two decimal places, setting the tolerance to ±0.05mm, and determining the general outline of the sample chain plate.
[0009] Preferably, step 3 includes: based on the AutoCAD file .dwg of the sample chain plate shape, drawing circles on the tooth back arcs of 5-10 sample chain plates in the AutoCAD file using the three-point circle function, measuring the circle radius; after removing one maximum and one minimum value, calculating the average value, rounding it to the nearest whole number, and taking the nearest whole number as 0mm or 5mm.
[0010] Preferably, step 4 includes: based on the AutoCAD file (.dwg) of the sample chain plate shape, drawing circles on the upper arcs of 5-10 sample chain plates using the three-point circle function in the AutoCAD file, measuring the circle radius; calculating the average value after removing one maximum and one minimum value, retaining one decimal place, with no tolerance requirement; taking the center of the chain plate as the origin, measuring the X and Y axis distances from the circle center to the origin, similarly removing one maximum and one minimum value, and calculating the average value to obtain the X and Y axis coordinates of the center of the upper arc.
[0011] Preferably, step 5 includes: based on the AutoCAD file .dwg of the sample chain plate shape, measuring the tooth angle and center distance of 5-10 sample chain plates in the AutoCAD file, removing one maximum and one minimum value and calculating the average value, rounding the angle to the nearest whole number, setting the tolerance to (0, -30′), and retaining two decimal places for the center distance, with a tolerance of ±0.02mm.
[0012] Preferably, step 6 includes: based on the AutoCAD file (.dwg) of the sample chain plate shape, drawing circles for the meshing arcs of 5-10 sample chain plates in the AutoCAD file using the three-point circle function, and measuring the circle radius; after removing one maximum and one minimum value, calculating the average value, retaining 3 decimal places, with no tolerance requirement; taking the center of the chain plate as the origin, measuring the X and Y axis distances from the center of the meshing arc to the origin, and similarly removing one maximum and one minimum value, calculating the average value to obtain the X and Y axis coordinates of the center of the meshing arc.
[0013] Preferably, step 7 includes: drawing circles in the AutoCAD file using the three-point circle function for the tooth tip arcs and transition arcs of 5-10 sample chain plates, measuring the circle radius; calculating the average value after removing one maximum and one minimum value, retaining one decimal place, with no tolerance requirement.
[0014] Preferably, step 8 includes: based on the AutoCAD file (.dwg) of the sample chain plate shape, measuring the distance from the top of the waist arc to the origin of 5-10 sample chain plates in the AutoCAD file; calculating the average value after removing one maximum and one minimum value, retaining one decimal place, with no tolerance requirement; determining the position of the vertex of the waist arc based on the average value and drawing a straight line passing through the vertex of the waist arc along the X-axis; drawing a circle using the tangent-tangent-tangent command, where the objects of the tangent-tangent-tangent commands are the straight line and the meshing arcs on the left and right sides, respectively; and obtaining the shape, size, and position of the waist arc by trimming.
[0015] The beneficial effects of the method for designing toothed chain segments according to the present invention are as follows: This invention enables rapid reverse engineering of chain plates for toothed chains, effectively reducing the difficulty of reverse engineering, improving the convenience of drawing, and producing chain plates with high dimensional accuracy, which can achieve good matching with sprockets. Attached Figure Description
[0016] Figure 1 : The design method of this invention targets the toothed chain plate structure diagram.
[0017] In the diagram: 1. Tooth width, 2. Engagement arc, 3. Tooth height, 4. Edge center distance, 5. Upper arc, 6. Transition arc, 7. Tooth angle, 8. Waist arc, 9. Tooth back arc, 10. Tooth tip arc, 11. Chain plate center / origin (coordinates (0,0)). Detailed Implementation
[0018] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
[0019] The following embodiments can be understood as illustrating a part of the structure or method of the present invention individually, or as combining the embodiments to explain the broader structure or method of the present invention.
[0020] Example 1: This invention provides a method for designing toothed chain segments, such as... Figure 1 As shown, it includes the following steps: Step 1: Disassemble and obtain the sample chain plate, and scan it using a three-dimensional coordinate device to obtain the CAD shape features of the sample chain plate; Step 2: Obtain the overall dimensions of the sample chain plate using calipers; Step 3: Obtain the radius of the arc on the back of the chain plate teeth using CAD software; Step 4: Obtain the center coordinates and radius of the upper arc of the chain plate using CAD software; Step 5: Measure the tooth angle and center distance of the chain plate using CAD software; Step 6: Obtain the center coordinates and radius of the meshing arc of the chain plate using CAD software; Step 7: Obtain the radius of the tooth tip arc and transition arc of the chain plate using CAD software; Step 8: Obtain the shape, size, and position of the waist arc of the chain plate using CAD software.
[0021] Example 2: Based on Example 1, this example discloses: Figure 1 As shown, step 1 includes: grinding the riveted pins of the chain flat with a grinding wheel; placing the chain with the flattened pins on a disassembly mold; disassembling it with disassembly pins; taking 5-10 sample chain plates with a gloss level of over 70%; performing shape scanning using a coordinate measuring machine (CMM); and outputting an AutoCAD file (.dwg) of the sample chain plate shape. A CMM is an instrument that performs precision inspection in three-dimensional space by measuring the coordinates (X, Y, Z) of feature points on the workpiece surface. It is widely used in industrial manufacturing. Its core function is to collect workpiece surface data points through contact or non-contact probes, combine this with a grating ruler displacement measurement system, and use a computer or data processing software to calculate the coordinates (x, y, z) of each point to evaluate parameters such as dimensional accuracy, positioning accuracy, geometric accuracy, and contour accuracy. Commercially available products can be selected.
[0022] In this embodiment, the reason for selecting a sample chain plate with a bright band of over 70% is that when using a coordinate measuring machine (CMM) for shape scanning, the CMM probe is in contact with the actual chain plate. If the bright band is poor, the contact between the probe and the actual chain plate will fluctuate, resulting in curved lines that complicate the subsequent drawing of the chain teeth. A chain plate directly opposite the guide plate and connected via a pin can be selected because the deformation of this section is minimal (negligible), and its bright band usually meets the requirements.
[0023] Example 3: Based on Embodiment 2, this embodiment discloses: Figure 1 As shown, step 2 includes: using calipers to measure the tooth height 3 and tooth width 1 of 5-10 sample chain plates, removing one maximum and one minimum value from the measured data, calculating the average value, retaining two decimal places, and setting the tolerance to ±0.05mm to determine the general outline of the sample chain plate.
[0024] In this embodiment, tooth height 3 and tooth width 1 are both commonly used concepts. Tooth height 3 refers to the maximum vertical distance from the top to the bottom of the toothed chain plate; tooth width 1 refers to the maximum width of the left and right ends of the toothed chain plate. For example... Figure 1 As shown, after the sample chain plate model has been drawn, the tooth height 3 and tooth width 1 can be obtained to determine the general outline of the sample chain plate.
[0025] Example 4: Based on Example 3, this example discloses: Figure 1 As shown, step 3 includes: based on the AutoCAD file .dwg of the sample chain plate shape, draw circles for the tooth back arc 9 of 5-10 sample chain plates in the AutoCAD file using the three-point circle function, and measure the circle radius; after removing one maximum and one minimum value, calculate the average value, round it to the nearest whole number, and the nearest whole number is 0mm or 5mm.
[0026] The purpose of this embodiment is to determine the radius of the tooth back arc, and thus determine the shape and size of the tooth back arc. The three-point circle function is a common drawing tool in CAD. In the process of drawing the tooth back arc, the three points are selected as follows: the first and third points are respectively taken as the points where the upper arc and the back arc intersect. Since the exact position cannot be captured at the intersection, the points can usually be moved 1mm closer to the Y-axis to ensure that the points are on the tooth back arc. The second point is selected based on the AutoCAD file .dwg of the sample chain plate shape, at the point where the back arc intersects with the Y-axis.
[0027] Example 5: Based on Example 4, this example discloses: Figure 1As shown, step 4 includes: based on the AutoCAD file (.dwg) of the sample chain plate shape, drawing circles for the upper arcs 5 of 5-10 sample chain plates using the three-point circle function in the AutoCAD file, and measuring the radius of the circle; after removing one maximum and one minimum value, calculating the average value, retaining one decimal place, with no tolerance requirement; taking the center of the chain plate as the origin, measuring the X and Y axis distances from the center of the circle to the origin, and similarly removing one maximum and one minimum value, calculating the average value, to obtain the X and Y axis coordinates of the center of the upper arc.
[0028] In this embodiment, the upper arc 5 is the arc at both shoulders of the toothed chain plate. One end of it is connected to one end of the tooth back arc 9, and the other end is connected to the upper end of the transition arc 6 at the left or right end of the toothed chain plate. The method of obtaining the radius by forming a circle from three points is the same as in Embodiment 4 (hereinafter the same). After obtaining the radius of the upper arc 5 and the distance between its center and the center of the chain plate, i.e., the origin, the shape and size of the upper arc 5 at both shoulders of the toothed chain plate can be determined. Among them, the origin, i.e., the center of the sample chain plate, is the intersection of the height midline and the width midline, and its coordinates are (0,0). The height midline of the chain plate is defined as the X-axis, and the width midline is defined as the Y-axis.
[0029] Example 6: Based on Example 5, this example discloses: Figure 1 As shown, step 5 includes: based on the AutoCAD file .dwg of the sample chain plate shape, measuring the tooth angle 7 and the center distance 4 of 5-10 sample chain plates in the AutoCAD file, removing one maximum and one minimum value and calculating the average value, rounding the angle to the nearest whole number, setting the tolerance to (0, -30′), and keeping the center distance to two decimal places, with a tolerance of ±0.02mm.
[0030] In this embodiment, the tooth angle 7 refers to the included angle between the outer walls of the two teeth of the toothed chain plate, and the center-to-center distance 4 refers to the vertical distance between the outer wall of the tooth and the center of the hole in the chain plate on the same side. Once the center-to-center distance and the tooth angle are determined, the positions of the outer walls of the two teeth can be obtained.
[0031] Example 7: Based on Example 6, this example discloses: Figure 1 As shown, step 6 includes: based on the AutoCAD file .dwg of the sample chain plate shape, drawing circles for the meshing arcs 2 of 5-10 sample chain plates in the AutoCAD file using the three-point circle function, and measuring the circle radius; after removing one maximum and one minimum value, calculating the average value, retaining 3 decimal places, with no tolerance requirement; taking the center of the chain plate as the origin, measuring the X and Y axis distances from the center of the meshing arc to the origin, and similarly removing one maximum and one minimum value, calculating the average value, and obtaining the X and Y axis coordinates of the center of the meshing arc.
[0032] In this embodiment, the meshing arc 2 is an arc located on the inner side of the tooth to mesh with the side wall of the sprocket tooth. After obtaining the coordinates of its radius and center, its position and shape can be determined to ensure that the chain plate tooth meshes tightly with the sprocket tooth.
[0033] Example 8: Based on Example 7, this example discloses: Figure 1 As shown, step 7 includes: based on the AutoCAD file .dwg of the sample chain plate shape, draw circles for the tooth tip arc 10 and transition arc 6 of 5-10 sample chain plates in the AutoCAD file using the three-point circle function, and measure the circle radius; after removing one maximum and one minimum value, calculate the average value, retain one decimal place, and there are no tolerance requirements.
[0034] In this embodiment, as Figure 1 As shown, the tooth tip arc 10, as the name suggests, is the arc at the tip of the tooth; the transition arc is the arc connecting the top of the tooth sidewall and the bottom of the upper arc. Because these two arcs do not affect the meshing of the chain plate and the sprocket and have no impact on the use of the chain, it is not necessary to measure the coordinates of the center of the arc.
[0035] Example 9: Based on Example 8, this example discloses: Figure 1 As shown, step 8 includes: based on the AutoCAD file .dwg of the sample chain plate shape, measuring the distance from the top of the waist arc 8 of 5-10 sample chain plates to the origin in the AutoCAD file; after removing one maximum and one minimum value, calculating the average value, retaining one decimal place, with no tolerance requirement; determining the position of the vertex of the waist arc based on the average value and drawing a straight line passing through the vertex of the waist arc along the X-axis; drawing a circle using the tangent-tangent-tangent command, where the objects of the tangent-tangent-tangent commands are the straight line and the meshing arcs on the left and right sides, respectively; and obtaining the shape, size, and position of the waist arc by trimming (cutting off the part below the intersection of the meshing arcs on both sides and the circle).
[0036] In this embodiment, the waist arc 8 refers to the arc at the bottom of the tooth groove between two teeth, which is used to connect the meshing arcs 2 on both sides. After obtaining the radius and coordinates of the waist arc, the position and shape of the waist arc can be obtained.
[0037] In this embodiment, the waist arc does not use the three-point circle method because the three-point circle method is used when there is no correlation and the desired result cannot be obtained by other means. The waist arc here can be drawn directly by other means, so the center coordinates are not needed. First, the distance from the top of the waist arc to the origin is determined by measurement. Then, a straight line is drawn. Then, the tangent-tangent-tangent command in CAD is used to select the straight line and the arcs on both sides respectively, which will directly form a circle. After correction, the final desired arc is obtained.
[0038] It should be noted that the CAD software in this invention can be AutoCAD or other CAD software capable of performing the relevant functions. Regardless of the CAD software used to implement the technical solution of this invention, it is within the protection scope of this invention.
Claims
1. A method for designing toothed chain segments, characterized in that, Includes the following steps: Step 1: Disassemble and obtain the sample chain plate, and scan it using a three-dimensional coordinate device to obtain the CAD shape features of the sample chain plate; Step 2: Obtain the overall dimensions of the sample chain plate using calipers; Step 3: Obtain the radius of the arc on the back of the chain plate teeth using CAD software; Step 4: Obtain the center coordinates and radius of the upper arc of the chain plate using CAD software; Step 5: Measure the tooth angle and center distance of the chain plate using CAD software; Step 6: Obtain the center coordinates and radius of the meshing arc of the chain plate using CAD software; Step 7: Obtain the radius of the tooth tip arc and transition arc of the chain plate using CAD software; Step 8: Obtain the shape, size, and position of the waist arc of the chain plate using CAD software.
2. The method for designing toothed chain segments as described in claim 1, characterized in that, Step 1 includes: grinding the pins in the chain after riveting with a grinding wheel, placing the chain with the ground pins on a disassembly mold, disassembling it with disassembly pins, taking 5-10 sample chain plates with a gloss band of more than 70%, performing shape scanning with a coordinate measuring machine, and outputting an AutoCAD file .dwg of the sample chain plate shape.
3. The method for designing toothed chain segments as described in claim 2, characterized in that, Step 2 includes: using calipers to measure the tooth height and tooth width of 5-10 sample chain plates, removing one maximum and one minimum value from the measured data, calculating the average value, retaining two decimal places, setting the tolerance to ±0.05mm, and determining the general outline of the sample chain plate.
4. The method for designing toothed chain segments as described in claim 3, characterized in that, Step 3 includes: based on the AutoCAD file .dwg of the sample chain plate shape, draw circles on the tooth back arcs of 5-10 sample chain plates in the AutoCAD file using the three-point circle function, and measure the circle radius; after removing one maximum and one minimum value, calculate the average value, round it to the nearest whole number, and the nearest whole number is 0mm or 5mm.
5. The method for designing toothed chain segments as described in claim 4, characterized in that, Step 4 includes: based on the AutoCAD file (.dwg) of the sample chain plate shape, draw circles on the upper arcs of 5-10 sample chain plates using the three-point circle function, and measure the radius of the circles; after removing one maximum and one minimum value, calculate the average value, retain one decimal place, with no tolerance requirement; with the center of the chain plate as the origin, measure the X and Y axis distances from the center of the circle to the origin, and similarly, after removing one maximum and one minimum value, calculate the average value to obtain the X and Y axis coordinates of the center of the upper arc.
6. The method for designing toothed chain segments as described in claim 5, characterized in that, Step 5 includes: based on the AutoCAD file (.dwg) of the sample chain plate shape, measuring the tooth angle and center distance of 5-10 sample chain plates in the AutoCAD file, removing the maximum and minimum values and calculating the average value, rounding the angle to the nearest whole number, setting the tolerance to (0, -30′), and retaining two decimal places for the center distance, with a tolerance of ±0.02mm.
7. The method for designing toothed chain segments as described in claim 6, characterized in that, Step 6 includes: based on the AutoCAD file (.dwg) of the sample chain plate shape, drawing circles for the meshing arcs of 5-10 sample chain plates using the three-point circle function in the AutoCAD file, and measuring the circle radius; after removing one maximum and one minimum value, calculating the average value, retaining 3 decimal places, with no tolerance requirement; taking the center of the chain plate as the origin, measuring the X and Y axis distances from the center of the meshing arc to the origin, and similarly removing one maximum and one minimum value, calculating the average value to obtain the X and Y axis coordinates of the center of the meshing arc.
8. The method for designing toothed chain segments as described in claim 7, characterized in that, Step 7 includes: based on the AutoCAD file .dwg of the sample chain plate shape, draw circles for the tooth tip arcs and transition arcs of 5-10 sample chain plates in the AutoCAD file using the three-point circle function, and measure the circle radius; after removing one maximum and one minimum value, calculate the average value, retain one decimal place, and there are no tolerance requirements.
9. A method for designing toothed chain segments as described in claim 8, characterized in that, Step 8 includes: based on the AutoCAD file (.dwg) of the sample chain plate shape, measuring the distance from the top of the waist arc to the origin of 5-10 sample chain plates in the AutoCAD file; after removing one maximum and one minimum value, calculating the average value, retaining one decimal place, with no tolerance requirement; determining the position of the vertex of the waist arc based on the average value and drawing a straight line passing through the vertex of the waist arc along the X-axis; drawing a circle using the tangent-tangent-tangent command, where the objects of the tangent-tangent-tangent commands are the straight line and the meshing arcs on the left and right sides, respectively; and obtaining the shape, size, and position of the waist arc by trimming.