TWI750900B - Method for establishing tool assessment index and computer program product thereof - Google Patents

Abstract

A method for establishing tool assessment index and its application are provided. In the method, at least one set of sensing data generated while a tool is processing at least one workpiece in a time sequence, in which the sensing data is generated by a first sensor and a second sensor which are attached on a tool holder during a period of processing time. The tool is disposed on the tool holder, and the tool has plural blades. Then, at least one force distribution diagram of the blades is built by using the sensing data, in which the force distribution diagram shows stress points of blades during the processing time period. Thereafter, a calculation step is performed to obtain at least one tool assessment index according to the force distribution diagram, in which the calculation step includes calculating relative positions between the stress points and a center point.

Description

A method for establishing tool evaluation index and its computer program product

The present invention relates to a method for establishing a tool evaluation index and its application, in particular to a method for establishing a tool evaluation index by using a sensor to capture the force condition of the tool during machining and its application in computer program products.

Tool wear or missing edge is a common problem in machining. Tool wear will reduce the machining accuracy of the workpiece and the service life of the overall machine tool equipment, resulting in problems affecting production efficiency.

In order to avoid losses due to tool wear, the current practice is for operators to replace the tool based on their experience or with reference to the average life of the tool. However, this practice often causes the tool to be severely worn and not replaced immediately, and the tool is not severely worn and is eliminated. and so on. Therefore, real-time monitoring and mastering of tool health status has become the goal of the relevant industry.

Therefore, an object of the present invention is to provide a tool evaluation index The establishment method is based on the force sensing data captured by the tool in the processing stage to establish the force distribution map of the cutting edge, and use the force distribution map of the cutting edge to establish the tool evaluation index, which is used to judge whether the tool can continue to be used. refer to.

According to the above purpose of the present invention, a method for establishing a tool evaluation index is proposed. The method for establishing the tool evaluation index includes the following steps: obtaining at least one set of sensing data generated by the tool in time sequence when processing at least one workpiece, wherein each set of sensing data is obtained by a first sensor installed on the tool handle and the second sensor are generated during a period of machining time, wherein the tool is mounted on the tool handle, and the tool has a plurality of cutting edges; using the sensing data to establish at least one cutting edge force distribution map, wherein each cutting edge force distribution map Displays a plurality of force points of the cutting edge of the tool during a machining time; the calculation step is performed according to the force distribution diagram of the cutting edge, wherein the calculation step includes calculating the relative positional relationship between the plurality of force points and the center point, so as to obtain at least one tool Evaluation Metrics.

According to an embodiment of the present invention, the above-mentioned force points are distributed in the orthogonal coordinate system established by the first coordinate axis and the second coordinate axis in the force distribution diagram of the blade, wherein the first coordinate axis and the second coordinate axis are staggered. The point is the center point, the first coordinate axis corresponds to the torque generated by the first sensor, and the second coordinate axis corresponds to the torque generated by the second sensor. Among them, the tool evaluation index includes the asymmetry index, and the above calculation step includes the following steps: judging the plurality of parts in the force point that are farthest from the center point, wherein these parts correspond to the cutting edge of the tool one-to-one; calculate separately The distance between the average position of the points of force in these parts and the center point, and the complex number is obtained A distance value; calculate the ratio of the distance values corresponding to any two adjacent or any two opposite blades and the reciprocal value of the above ratio, and take the largest of the ratio and the reciprocal value as each any two adjacent or The asymmetry value of any two opposite blades; the asymmetry index is established by taking the maximum of the asymmetry values of any two adjacent or any two opposite blades.

According to an embodiment of the present invention, the number of the above-mentioned blades is odd or even. When the number of cutting edges is odd, the asymmetry value is calculated with every two adjacent cutting edges. When the number of the cutting edges is an even number, the asymmetry value is calculated based on any two opposing cutting edges.

According to an embodiment of the present invention, the above-mentioned force points are distributed in the orthogonal coordinate system established by the first coordinate axis and the second coordinate axis in the force distribution diagram of the blade, wherein the first coordinate axis and the second coordinate axis are staggered. The point is the center point, the first coordinate axis corresponds to the torque generated by the first sensor, and the second coordinate axis corresponds to the torque generated by the second sensor. Among them, the tool evaluation index includes the maximum torque index, and the above calculation step includes the following steps: judging the multiple parts of the force point that are farthest from the center point, and these parts correspond to the cutting edge of the tool one-to-one; Calculate the distance between the average position of the force point in the part and the center point, and obtain multiple distance values; calculate multiple ratios between the distance values corresponding to these parts and the reference value; use the average of the above ratios to establish the maximum torque index.

According to an embodiment of the present invention, the above-mentioned force points are distributed in the orthogonal coordinate system established by the first coordinate axis and the second coordinate axis in the force distribution diagram of the blade, wherein the first coordinate axis and the second coordinate axis are staggered. The point is the center point, and the first coordinate axis corresponds to the force generated by the first sensor moment, the second coordinate axis corresponds to the moment generated by the second sensor. Among them, the tool evaluation index includes the center deflection index. The sensing data includes a first set of sensing data and a second set of sensing data generated in time series. The at least one blade force distribution map above includes a first blade edge force distribution map and a second blade edge force distribution map established by the first set of sensing data and the second set of sensing data, respectively. Wherein, the above calculation step includes the following steps: on each of the force distribution map of the first cutting edge and the force distribution map of the second cutting edge, setting a preset range with the center point as the center; and calculating the force distribution of the first cutting edge The reduction ratio of the number of medium force points within the preset range on the force distribution diagram of the second blade and the second edge force distribution diagram is used to establish the center deflection index.

According to an embodiment of the present invention, the above-mentioned method for establishing a tool evaluation index further includes judging whether the tool has processed at least one workpiece, and if the judgment result is yes, performing the step of obtaining sensing data.

According to an embodiment of the present invention, wherein the knife handle has a central axis, and the included angles between the installation positions of the first sensor and the second sensor and the line connecting the central axis are 90 degrees.

According to an embodiment of the present invention, the disposition direction of the first sensor and the second sensor is parallel to the rotation tangent of the handle.

According to the above object of the present invention, another computer program product for establishing tool evaluation index is proposed. When the computer program is loaded and executed, the establishment method of the above-mentioned tool evaluation index can be completed.

As can be seen from the above, the present invention mainly uses the sensing data of the force on the tool and the handle captured by the sensor when the tool is being processed, and establishes the force distribution map of the cutting edge based on the sensing data. On the other hand, the present invention further According to the force distribution map of the blade edge, the tool evaluation indicators such as the asymmetry index, the maximum torque index and the center deflection index are calculated, so as to provide the operator with a reference to quickly interpret the health status of the tool, and replace the tool in time, thereby improving the overall processing quality.

110: Spindle

120: Knife handle

121: The first sensor

122: Second sensor

200: Establishment of Tool Evaluation Metrics

210, 220, 230, 240: Steps

A1: Part 1

A2: Part II

A3: Part III

A4: Part IV

B1,B2,B3,B4: Distance value

C1: Part 1

C2: Part II

C3: with the third part

D1, D2, D3: distance value

E1,E1': Part 1

E2, E2': Part II

E3, E3': Part Three

E4, E4': Part Four

F1,F1',F2,F2',F3,F3',F4,F4': distance value

G1, G2: Preset range

R1: The preset range of the first threshold value

R2: The preset range of the second threshold value

S1: central axis

T1: Tool

In order to make the above-mentioned and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows: FIG. 1A is a schematic diagram of a partial device of a processing machine according to an embodiment of the present invention; 1B is a top view of a tool handle according to an embodiment of the present invention; FIG. 2 is a block flow diagram illustrating a method for establishing a tool evaluation index according to an embodiment of the present invention; The schematic diagram of the embodiment for explaining the establishment of asymmetry index for the force distribution map of the blade of a tool with an even number of blades; FIG. Figure 5A and Figure 5B are schematic diagrams illustrating the establishment of the maximum torque index for the force distribution map of the blade according to an embodiment of the present invention; Figures 6A and 6B are a schematic diagram illustrating the establishment of a center yaw index for a force distribution map of a blade according to an embodiment of the present invention; and 7A and 7B are schematic diagrams illustrating tool evaluation indicators in different states according to an embodiment of the present invention.

Please refer to FIGS. 1A and 1B , wherein FIG. 1A is a schematic diagram of a partial device of a processing machine according to an embodiment of the present invention, and FIG. 1B is a top view of a knife handle according to an embodiment of the present invention. The processing machine includes a main shaft 110 , a tool holder 120 provided on the main shaft 110 , and a tool T1 mounted on the tool holder 120 . In this embodiment, the handle 120 is provided with a first sensor 121 and a second sensor 122 . The knife handle 120 has a central axis S1, the installation positions of the first sensor 121 and the second sensor 122 are respectively at an angle of 90 degrees with the line connecting the distances from the central axis, and the first sensor 121 and the second sensor 122 are at an angle of 90 degrees. The orientation of the detector 122 is parallel to the rotational tangent of the handle. Therefore, when the tool T1 is processing the workpiece, the first sensor 121 and the second sensor 122 disposed on the tool holder 120 can generate sensing data of the force on the tool T1 and the tool holder 120 . In some examples, the first sensor 121 and the second sensor 122 may be strain gauges or piezoelectric materials.

Please also refer to FIG. 2 . FIG. 2 is a block flow diagram illustrating a method for establishing a tool evaluation index according to an embodiment of the present invention. The method 200 for establishing a tool evaluation index in this embodiment mainly includes the following steps. First, step 210 is performed to determine whether the tool T1 has processed the workpiece. When the determination result is yes, a processing time can be set as the preset sampling time. In one example, the associated wage increase of the machine tool can be retrieved directly by material, or according to the force sensing data of the tool handle 120 to determine whether the tool T1 has processed the workpiece. After it is determined that the tool T1 is processing the workpiece, and the preset sampling time is set within the processing time, then step 220 is performed to obtain at least one set of sensing data chronologically generated by the tool T1 when processing at least one workpiece. As shown in FIG. 1 , the tool T1 is installed on the tool holder 120 , and each set of sensing data is obtained by the first sensor 121 and the second sensor 122 installed on the tool holder 120 during a processing time (preset sample time).

After step 220 is performed, step 230 is then performed to use the sensing data to establish a force distribution map of at least one cutting edge. The force distribution diagram of the blade can refer to, for example, FIG. 3 . In one embodiment, the tool T1 has a plurality of blades, and the force distribution diagram of the blade shows a plurality of points of force on the blade of the tool T1 during a machining time. As shown in Figure 3, the force points are distributed in the orthogonal coordinate system established by the first coordinate axis and the second coordinate axis in the force distribution diagram of the blade, wherein the intersection point of the first coordinate axis and the second coordinate axis is the center point, And the first coordinate axis corresponds to the torque generated by the first sensor 121 , and the second coordinate axis corresponds to the torque generated by the second sensor 122 . After the force distribution map of the blade is established, then step 240 is performed to perform the calculation step according to the force distribution map of the blade. Wherein, the calculation step includes calculating the relative positional relationship between the force point and the center point respectively, so as to obtain at least one tool evaluation index. In one embodiment, the tool evaluation index may include an asymmetry index, a maximum torque index, and a center yaw index. The tool evaluation index is mainly used as a reference for judging whether the tool can continue to be used.

The method for establishing the asymmetry index will be described below. First, judge the A plurality of parts of the force point farthest from the center point, wherein these parts correspond to the cutting edge of the tool T1 one-to-one.

Please refer to FIG. 3 . FIG. 3 is a schematic diagram illustrating establishing an asymmetry index for a force distribution diagram of a blade of a tool with an even number of blades according to an embodiment of the present invention. Specifically, FIG. 3 is a diagram of the force distribution of the blade edge generated when the tool T1 with 4 blade edges is used to process the workpiece. Therefore, there are four parts farthest from the center point, such as the first part A1 , the second part A2 , the third part A3 and the fourth part A4 in FIG. 3 . Next, calculate the distance between the average position and the center point of the force points in these parts (the first part A1, the second part A2, the third part A3 and the fourth part A4) respectively, and obtain a plurality of distance values. The above-mentioned average position is the average of the distances between the plurality of force-bearing points farthest from the center point in each part and the center point, as the distance value between each part and the center point. In the example of FIG. 3 , the distance between the first part A1 and the center point is B1, the distance between the second part A2 and the center point is B2, the distance between the third part A3 and the center point is B3, and the fourth part A4 and the center point are B3. The distance value of the center point is B4. Then, calculate the ratio and the reciprocal value of the distance values corresponding to any two opposite blades among the four blades, and take the largest of the ratio and the inverse value of the ratio as the asymmetry value of any two opposite blades. For example, for a tool with 4 cutting edges, the ratio of the distance between the first cutting edge and the third cutting edge is (B1/B3), and the reciprocal value of the ratio is (B3/B1), where the ratio (B1/B3) and the The largest of the reciprocal values of the ratio (B3/B1) is used as the asymmetry value m1 between the first cutting edge and the third cutting edge, that is, m1=max[(B1/B3),(B3/B1)]. Similarly, the ratio of the distance between the second cutting edge and the fourth cutting edge is (B2/B4), The reciprocal value of the ratio is (B4/B2), and the largest of the ratio (B2/B4) and the reciprocal value (B4/B2) of the ratio is used as the asymmetry value m2 between the second blade and the fourth blade, that is, m2 =max[(B2/B4),(B4/B2)]. Finally, the asymmetry index Sym1 is established by taking the maximum value of the asymmetry between any two relative blades, namely Sym1=max(m1,m2).

Generally speaking, when the tool is not in use, the shape of the cutting edge in the force distribution diagram will be similar, and after the tool has been used for a period of time, different cutting edges in the same tool will be missing or lost due to machining factors. . Therefore, the force of different cutting edges of used tools will be different during the machining process, so the force points in the force distribution diagram of the cutting edge will also change. Therefore, by calculating the proportional relationship between the distances between the different parts of the corresponding blade and the center point in the force distribution diagram of the blade, it can be used as the basis for establishing the asymmetry index.

For the sake of illustration, the foregoing embodiment takes a knife having an even number (eg, 4) blades as an example for illustration purposes, and is not intended to limit the present invention. In other embodiments, when the number of cutting edges of the tool is odd, the calculation step of the asymmetry index includes the following steps. Please also refer to FIG. 4 , which is a schematic diagram illustrating establishing an asymmetry index for a force distribution diagram of a blade of a tool with an odd number of blades according to an embodiment of the present invention. In this embodiment, the calculation step of establishing the asymmetry index includes the following steps. First, determine the plurality of parts of the force-bearing point that are farthest from the center point, and these parts correspond to the cutting edge of the tool T1 one-to-one.

Taking FIG. 4 as an example, FIG. 4 is a diagram showing the force distribution of the cutting edge when the tool T1 with three cutting edges is used to process the workpiece. Therefore, there are 3 parts farthest from the center point, such as the first part C1, the second part C2, and the second part C2. Three-part C3. Next, the distances between the average positions of the force-receiving points in these parts (the first part C1, the second part C2, and the third part C3) and the center point are calculated respectively to obtain a plurality of distance values. The above-mentioned average position is the average of the distances between the plurality of force-bearing points farthest from the center point in each part and the center point, as the distance value between each part and the center point. In the example of FIG. 4 , the distance between the first part B1 and the center point is C1 , the distance between the second part B2 and the center point is C2 , and the distance between the third part B3 and the center point is C3 . Then, calculate the ratio and the reciprocal value of the distance values corresponding to any two adjacent cutting edges among the three cutting edges, and take the largest of the ratio and the reciprocal value as the asymmetry value of any two opposing cutting edges. For example, taking a tool with 3 cutting edges as an example, the ratio of the distance between the adjacent first cutting edge and the second cutting edge is (C1/C2), and the reciprocal value of the ratio is (C2/C1), where the ratio (C1/C2) The largest of the reciprocal values of the ratio (C2/C1) is the asymmetry value m3 of the adjacent first cutting edge and the second cutting edge, that is, m3=max[(C1/C2),(C2/C1)]. The ratio of the distance between the adjacent second cutting edge and the third cutting edge is (C2/C3), and the reciprocal value of the ratio is (C3/C2). The largest one is used as the asymmetry value m4 between the second blade and the third blade, that is, m3=max[(C2/C3),(C3/C2)]. The ratio of the distance between the adjacent third cutting edge and the first cutting edge is (C3/C1), the reciprocal value of the ratio is (C1/C3), and the ratio (C3/C1) and the reciprocal value of the ratio (C1/C3) The largest one is used as the asymmetry value m5 between the third blade and the first blade, that is, m5=max[(C3/C1),(C1/C3)]. Finally, the asymmetry index Sym2 is established by taking the maximum of the asymmetry values of each two adjacent blades, namely Sym2=max[m3,m4,m5].

The method for establishing the maximum torque index will be described below. Please refer to FIG. 5A and FIG. 5B at the same time. FIGS. 5A and 5B are schematic diagrams illustrating establishing a maximum torque index for a force distribution map of a blade according to an embodiment of the present invention. Before establishing the maximum torque index, first, according to the aforementioned steps 220 and 230 , the force distribution map of the blade as shown in FIG. 5A is obtained, which is established by using the sensing data generated by a new tool when machining the workpiece. Then, from the force distribution diagram of the blade, determine the multiple parts of the force point that are farthest from the center point, and these parts correspond to the blade of the new tool one-to-one. Taking FIG. 5A as an example, there are four parts farthest from the center point, such as a first part E1, a second part E2, a third part E3 and a fourth part E4. Next, calculate the distance between the average position and the center point of the force points in these parts (the first part E1 , the second part E2 , the third part E3 and the fourth part E4 ) to obtain a plurality of distance values. For example, the distance value between the first part E1 and the center point is F1, the distance value between the second part E2 and the center point is F2, the distance value between the third part E3 and the center point is F3, and the distance value between the fourth part E4 and the center point for F4. After obtaining the distance values F1, F2, F3 and F4 calculated from the force distribution diagram of the cutting edge produced by the machining of the new tool, these distance values can be used as the reference value when establishing the maximum torque index.

Referring to FIG. 5B , establishing the maximum torque index includes the following steps. First, according to the aforementioned steps 220 and 230 , the force distribution map of the blade as shown in FIG. 5B is obtained, which is established by using the sensing data generated by the tool to be tested when machining the workpiece. Then, from the force distribution diagram of the blade shown in FIG. 5B, determine the plurality of parts in the force point that are farthest from the center point, and these parts are a pair of One ground corresponds to the edge of the tool to be tested. Taking FIG. 5B as an example, there are four parts farthest from the center point, such as the first part E1', the second part E2', the third part E3' and the fourth part E4'. Next, calculate the distance between the average position and the center point of the force points in these parts (for example, the first part E1', the second part E2', the third part E3' and the fourth part E4'), and obtain a plurality of distance value. For example, the distance between the first part E1' and the center point is F1', the distance between the second part E'2 and the center point is F2', the distance between the third part E3' and the center point is F3', and the fourth part The distance between E4' and the center point is F4'. Next, a plurality of ratios between the distance values corresponding to these parts and the reference value are calculated. Specifically, the ratio sub1 of the distance value corresponding to the first part of the tool to be tested and the distance value corresponding to the first part of the new tool is (F1'/F1), that is, sub1=(F1'/F1); The ratio sub2 of the distance value of the second part to the distance value of the second part corresponding to the new tool is (F2'/F2), that is, sub2=(F2'/F2); the distance value corresponding to the third part of the tool to be tested is the same as The ratio sub3 of the distance value corresponding to the third part of the new tool is (F3'/F3), that is, sub3=(F3'/F3); the distance value corresponding to the fourth part of the tool to be tested and the fourth part corresponding to the new tool The ratio of the distance value of sub4 is (F4'/F4), that is, sub4=(F4'/F4). After obtaining the ratios of the distance values of the plurality of parts farthest from the center point in the force distribution diagram of the blade edge of the tool to be tested and the corresponding reference values, the maximum torque index Torque can be established by the average value of these ratios. In this implementation In the example, Torque=(sub1+sub2+sub3+sub4)/4.

Generally speaking, when the tool is not in use, the shape of the force diagram between the blade and the blade will be similar, so the torque received by each blade of the tool will be similar. Recently, after the tool has been used for a period of time, the different cutting edges of the tool will be missing or worn due to machining factors. Therefore, the force of the different cutting edges of the used tool will vary greatly during the machining process, so the force points in the force distribution diagram of the cutting edge will also change. Therefore, by calculating the ratio of the force of each edge of the tool to be tested to the force of each edge of the new tool, the change of the force torque of each edge of the tool to be tested relative to the new tool can be obtained. The average value of variation can be used as a maximum torque indicator.

The following describes the method of establishing the center yaw indicator. Please refer to FIG. 6A and FIG. 6B at the same time. FIG. 6A and FIG. 6B are schematic diagrams illustrating the establishment of the center yaw index for the force distribution map of the blade according to an embodiment of the present invention. When the center yaw index is established, the first set of sensing data and the second set of sensing data generated by the same tool in time sequence during processing are first obtained according to the aforementioned step 220 . Next, according to the aforementioned step 230, the first set of sensing data is used to establish the force distribution map of the first blade as shown in FIG. 6A, and the second set of sensing data is used to establish the second set of sensing data as shown in FIG. 6B. force distribution diagram. Then, on the force distribution diagram of the first blade shown in FIG. 6A and the force distribution diagram of the second blade shown in FIG. 6B , a predetermined range (eg, predetermined ranges G1 and G2 ) is set with the center point as the center. Next, calculate the number n of force points within the predetermined range G1 on the force distribution diagram of the first blade shown in FIG. 6A and the predetermined range on the force distribution diagram of the second blade shown in FIG. 6B , respectively. The number n' of force points in G2. Specifically, when the same tool is gradually worn out during the machining process, when the wear of each edge is uneven or the tool tip is unbalanced, the center deflection will gradually occur, that is, the force on the tool handle will also change accordingly. Therefore, using the first sensor and the second sensor According to the force distribution map of the blade created by the sensing data detected by the detector, the number of force points within the preset range of the tool center will also change. Therefore, the center yaw index RC can be established by calculating the reduction ratio of the number of medium force points within the preset range on the force distribution diagram of the blade edge. In one embodiment, RC=constant k+max(n-n')/n. The constant k can be 0 or can be set according to requirements.

After obtaining the tool evaluation indexes such as asymmetry index, maximum torque index and center yaw index, experts can define the threshold value according to the asymmetry index, maximum torque index and center yaw index calculated according to the historical (or tool sample) data , which is used to judge the tool state corresponding to the asymmetry index, the maximum torque index and the center deflection index calculated according to the tool to be tested, and the judgment result can be visualized. For example, the inner and outer concentric circles shown in FIGS. 7A and 7B can be used to represent the preset range R1 of the first threshold value and the preset range R2 of the second threshold value, wherein the first threshold value and the second threshold value respectively represent The health and unhealthy (or recommended replacement) status of the tool. Then, according to the relationship between the calculated asymmetry index, the maximum torque index and the center yaw index of the tool to be tested and the first threshold value and the second threshold value, respectively, three pointing graphs are presented. Taking FIG. 7A as an example, the directional patterns of the asymmetry index, the maximum torque index and the center yaw index shown in FIG. 7A are within the preset range R1 of the first threshold value, which means that the tool is in a healthy state. Taking FIG. 7B as an example, the asymmetry index and the center yaw index shown in FIG. 7B have exceeded the preset range R1 of the first threshold value, and the maximum torque index has exceeded the preset range R2 of the second threshold value. Indicates that the tool is overloaded and a tool replacement is recommended. Thereby, by converting the tool evaluation index into Fig. 7A and Fig. 7B image to display whether the threshold value is exceeded, which can provide the operator with a quick grasp of the health status of the tool. In some embodiments, the three directional graphics corresponding to the asymmetry index, the maximum torque index, and the center yaw index can be presented in different colors, so as to improve the operator's judgment speed.

It can be understood that, the method 200 for establishing the tool evaluation index of the present invention is the implementation steps described above. The order of each implementation step described in the above embodiments may be adjusted, combined or omitted according to actual needs. The above-described embodiments may be implemented using a computer program product, which may include a machine-readable medium storing a plurality of instructions to program a computer to perform the steps of the above-described embodiments. Machine-readable media can be, but are not limited to, floppy disks, optical disks, CD-ROMs, magneto-optical disks, read-only memory, random access memory, erasable programmable read-only memory (EPROM), electronically erasable Except for programmable read only memory (EEPROM), optical or magnetic cards, flash memory, or any machine-readable medium suitable for storing electronic instructions. Furthermore, the embodiments of the present invention can also be downloaded as a computer program product, which can transfer the computer program of the present invention from a remote computer by using data signals of a communication connection (eg, a connection such as a network connection). product to the requesting computer.

As can be seen from the above embodiments of the present invention, the present invention mainly uses the sensing data of the force on the tool and the handle captured by the sensor when the tool is being processed, and establishes the force distribution map of the cutting edge based on the sensing data. On the other hand, the present invention further calculates tool evaluation indexes such as asymmetry index, maximum torque index and center yaw index according to the force distribution diagram of the blade, so as to provide the operator with a reference for quickly interpreting the tool status and changing the tool in time. This improves the overall processing quality.

Although the embodiments of the present disclosure have been disclosed above with examples, they are not intended to limit the embodiments of the present disclosure. Anyone with ordinary knowledge in the technical field, without departing from the spirit and scope of the embodiments of the present disclosure, should Slight changes and modifications may be made, so the protection scope of the embodiments of the present disclosure should be determined by the scope of the appended patent application.

200: Establishment of Tool Evaluation Metrics

210, 220, 230, 240: Steps

Claims (8)

A method for establishing a tool evaluation index, comprising: obtaining at least one set of sensing data generated by a tool in time sequence when processing at least one workpiece, wherein each of the at least one set of sensing data is provided on a tool handle. A first sensor and a second sensor are generated during a machining time, wherein the tool is mounted on the tool holder, and the tool has a plurality of cutting edges; the at least one set of sensing data is used to establish at least one A force distribution diagram of the blade, wherein each of the at least one blade force distribution diagram shows a plurality of force points of the blades of the tool during the processing time, wherein the force points are distributed in the force distribution of the blade In an orthogonal coordinate system established by a first coordinate axis and a second coordinate axis in the distribution diagram, an intersection point of the first coordinate axis and the second coordinate axis is the center point, and the first coordinate axis corresponds to the The moment generated by the first sensor, the second coordinate axis corresponds to the moment generated by the second sensor; and a calculation step is performed according to the force distribution diagram of the at least one blade edge, wherein the calculation step includes calculating The relative positional relationship between the force points and a center point is obtained, and at least one tool evaluation index is obtained, wherein the at least one tool evaluation index includes an asymmetry index, and the calculation step includes: judging the distance between the force points A plurality of parts farthest from the center point, wherein these parts correspond to the cutting edges of the tool one-to-one; respectively calculate the distance between the average position of the force point in the parts and the center point, and obtain a plurality of distance values; Calculate a ratio of the distance values corresponding to any two adjacent or any two opposite blade edges and a reciprocal value of the ratio, and take the largest one of the ratio and the reciprocal value for each of the two phases One of the asymmetry values of the adjacent or any two opposite cutting edges; and the asymmetry index is established by taking the largest one of the asymmetry values of each any two adjacent or any two opposite cutting edges. The method for establishing a tool evaluation index according to claim 1, wherein the number of the cutting edges is an odd number or an even number, and when the number of the cutting edges is an odd number, the asymmetry value is calculated by using every two adjacent cutting edges; When the number of the cutting edges is an even number, the asymmetry value is calculated with every two opposite cutting edges. A method for establishing a tool evaluation index, comprising: obtaining at least one set of sensing data generated by a tool in time sequence when processing at least one workpiece, wherein each of the at least one set of sensing data is provided on a tool handle. A first sensor and a second sensor are generated during a machining time, wherein the tool is mounted on the tool holder, and the tool has a plurality of cutting edges; the at least one set of sensing data is used to establish at least one A force distribution diagram of the blade, wherein each of the at least one blade force distribution diagram shows a plurality of force points of the blades of the tool during the processing time, wherein the force points are distributed in the force distribution of the blade One of the first blocks in the distribution map In an orthogonal coordinate system established by the coordinate axis and a second coordinate axis, an intersection point of the first coordinate axis and the second coordinate axis is the center point, and the first coordinate axis corresponds to the first sensor. The torque generated, the second coordinate axis corresponds to the torque generated by the second sensor; and a calculation step is performed according to the force distribution diagram of the at least one blade, wherein the calculation step includes calculating the force points respectively A relative positional relationship with a center point to obtain at least one tool evaluation index, wherein the at least one tool evaluation index includes a maximum torque index, and the calculation step includes: judging the complex number farthest from the center point among the force points parts, wherein these parts correspond to the cutting edges of the tool one-to-one; calculate the distance between the average position of the force point in the parts and the center point, and obtain a plurality of distance values; calculate the corresponding A plurality of ratios between the distance values of a part and a reference value respectively; and an average value of the ratios is used to establish the maximum torque index. A method for establishing a tool evaluation index, comprising: obtaining at least one set of sensing data generated by a tool in time sequence when processing at least one workpiece, wherein each of the at least one set of sensing data is provided on a tool handle. A first sensor and a second sensor are generated during a processing time, wherein the tool is mounted on the tool handle, and the tool has a plurality of cutting edges; Using the at least one set of sensing data to establish at least one force distribution map of the cutting edge, wherein each of the at least one cutting edge force distribution map shows a plurality of force points of the cutting edges of the tool during the machining time, wherein The force points are distributed in an orthogonal coordinate system established by a first coordinate axis and a second coordinate axis in the force distribution diagram of the cutting edge, wherein an intersection point of the first coordinate axis and the second coordinate axis is the center point, the first coordinate axis corresponds to the moment generated by the first sensor, the second coordinate axis corresponds to the moment generated by the second sensor; and the force distribution according to the at least one cutting edge Fig. 1 performs a calculation step, wherein the calculation step includes calculating the relative positional relationship between the force points and a center point, and obtains at least one tool evaluation index, wherein the at least one tool evaluation index includes a center deflection index, the At least one set of sensing data includes a first set of sensing data and a second set of sensing data generated in time series, and the at least one blade force distribution map includes the first set of sensing data and the second set of sensing data respectively. A first cutting edge force distribution map and a second cutting edge force distribution map established by a set of sensing data, the calculation step includes: in the first cutting edge force distribution map and the second cutting edge force distribution map, each of which is On the one hand, a preset range is set with the center point as the center; and the reduction ratio of the number of stress points in the preset range on the force distribution map of the first blade and the force distribution map of the second blade is calculated , to establish the center-swing indicator. Such as any one of request item 1, request item 3 and request item 4 The method for establishing the tool evaluation index further includes: judging whether the tool has processed the at least one workpiece, and if the judgment result is yes, performing the step of obtaining the sensing data. The method for establishing a tool evaluation index according to any one of claim 1, claim 3 and claim 4, wherein the tool handle has a central axis, and the setting positions of the first sensor and the second sensor are The included angles of the lines connecting with the central axis are 90 degrees. The method for establishing a tool evaluation index according to any one of claim 1, claim 3 and claim 4, wherein the setting directions of the first sensor and the second sensor are parallel to the rotation of the tool handle Tangent. A computer program product for establishing a tool evaluation index, when the computer loads and executes the computer program, the method for establishing the tool evaluation index described in any one of claim 1 to claim 7 can be completed.

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