An automatic wall thickness measurement method, processing method and system

Abstract

The application relates to an automatic wall thickness measuring method, a processing method and a system, the automatic wall thickness measuring method comprising the following steps: installing an ultrasonic probe on a main shaft of a machine tool; starting PCDMIS NC software, calling a thickness measuring program, and enabling the machine tool to control the ultrasonic probe to touch a single point on a part and simultaneously measure the wall thickness of the touched point; the thickness measuring program comprising a measuring point program of 3D position touch and a thickness measuring sub-program added to the measuring point program, the thickness measuring sub-program being a self-provided program of the ultrasonic probe thickness measurement, and after the touch is completed, the ultrasonic probe is retreated to a touch starting point. The application combines the ultrasonic probe on the machine and the PCDMIS NC software, realizes automatic measurement of 3D position coordinates and wall thickness, avoids manual measurement, improves the measurement efficiency and the subsequent part processing efficiency, and the measurement process does not need manual participation, thereby improving the operation automation and safety.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of construction measurement, and in particular to an automatic wall thickness measurement method, a machining method and system for weight reduction of a thin-walled part. BACKGROUND

[0002] When a large number of cylindrical thin-walled parts are thinned in a production enterprise of aerospace parts, first, a manual thickness measuring instrument is used to measure several hundred wall thickness values of each weight-reducing grid after rough machining of the workpiece, and a processing compensation value is calculated for each grid according to the wall thickness of the grid. The efficiency is low and error-prone, and the processing efficiency of the process cannot meet the batch requirements, so it is urgent to solve the problem of automatic and rapid measurement of the actual wall thickness before finishing. SUMMARY

[0003] To solve the above technical problems, the purpose of the application is to provide an automatic wall thickness measurement method, which can combine an on-machine ultrasonic probe and PCDMIS NC software to realize automatic measurement of 3D position coordinates and wall thickness, avoid manual measurement, improve measurement efficiency and subsequent part processing efficiency, and improve operation automation and safety without manual intervention in the measurement process.

[0004] To solve the above technical problems, the application proposes the following technical solutions:

[0005] The application relates to an automatic wall thickness measurement method, which comprises:

[0006] The ultrasonic probe is installed on the spindle of the machine tool;

[0007] The PCDMIS NC software is started, a thickness measurement program is called, and the machine tool can measure the wall thickness of the touch point while controlling the ultrasonic probe to touch a single point on the part, so that the machine tool simultaneously obtains the 3D position coordinates and the wall thickness value of the touch point;

[0008] The thickness measurement program comprises a 3D position touch measurement point program and a thickness measurement sub-program added to the measurement point program, and the thickness measurement sub-program is a self-provided program of the ultrasonic probe, and after the touch is completed, the ultrasonic probe is returned to the touch starting point.

[0009] In some embodiments of the application, a plurality of weight-reducing grids are formed on the side wall of the part to be weight-reduced, and a plurality of measurement points are measured on each weight-reducing grid, and the plurality of measurement points comprise a measurement point located at the center of the weight-reducing grid; the automatic wall thickness measurement method further comprises:

[0010] The numerical model of the part is imported into the PCDMIS NC software, for each measurement point of the weight reduction opening, a program is written according to the way of writing measurement vector points to measure the wall thickness value of each measurement point of the weight reduction opening;

[0011] It is judged whether the wall thickness value of the measurement point at the center of the weight reduction opening and the wall thickness value of the remaining measurement points are within the specified limit value, if yes, the wall thickness value of the measurement point at the center of the weight reduction opening is taken as the wall thickness value of the corresponding weight reduction opening, if not, an alarm is issued.

[0012] In some embodiments of the present application, the automatic wall thickness measurement method further comprises a step of verifying the measured wall thickness value, specifically:

[0013] The measured wall thickness values of the plurality of measurement points are compared with the wall thickness values measured by the manual thickness gauge, if the deviation of the measured wall thickness values of each corresponding measurement point is within the specified value, it indicates that the wall thickness measurement meets the use requirement, otherwise, it cannot meet the use requirement.

[0014] Compared with the prior art, the automatic wall thickness measurement method has the following advantages and beneficial effects:

[0015] The measurement point program written in the PCDMIS NC software can touch the position coordinates of a three-dimensional single point, and the ultrasonic probe can only measure the thickness in the Z direction, therefore, by combining the two, the thickness measurement sub-program of the ultrasonic probe is placed in the measurement point program, so that the wall thickness of the touched point can be measured while the three-dimensional position coordinates of the touched point are touched, the wall thickness in any direction is measured, the demand for automatic wall thickness measurement is met, the subsequent part processing efficiency is improved, the manual wall thickness measurement strength is reduced, and the subsequent part batch processing demand is also met.

[0016] The present application also relates to a processing method for reducing the weight of a thin-walled part, the thin-walled part has a plurality of weight reduction openings on the side wall to be reduced in weight, and the processing method comprises:

[0017] S1: the machine tool calls a processing program for reducing the weight of the thin-walled part;

[0018] S2: start the PCDMIS NC software and call the thickness measurement program, the machine tool controls the ultrasonic probe to touch a single point on the weight reduction opening and also measure the wall thickness at the same time, so that the machine tool simultaneously obtains the three-dimensional position coordinates and the wall thickness value of the touched point;

[0019] The ultrasonic probe is installed on the machine tool spindle, the thickness measurement program includes a 3D position touch measurement point program and a thickness measurement sub-program added to the measurement point program, the thickness measurement sub-program is a thickness measurement program for the ultrasonic probe, after the touch measurement is completed, the ultrasonic probe retreats to the touch starting point;

[0020] S3: determining whether the wall thickness value and the theoretical wall thickness value are within a specified deviation range, if yes, proceeding to S5, if no, recording the current wall thickness value and obtaining the tool compensation value corresponding to each weight reduction port according to the relationship between the wall thickness value and the tool compensation value and storing;

[0021] S4: after calling the tool setting instrument to reset the tool, returning to S1;

[0022] S5: processing is completed.

[0023] In some embodiments of the present application, S2 further comprises:

[0024] The numerical model of the thin-walled part is imported into the PCDMIS NC software, for a plurality of measurement points on each weight reduction port, a program is written in the manner of writing measurement vector points to measure the wall thickness values of a plurality of measurement points, wherein the plurality of measurement points include a measurement point located at the center of the weight reduction port;

[0025] Determining whether the wall thickness value of the measurement point at the center of the weight reduction port and the wall thickness values of the remaining measurement points are within a specified limit, if yes, the wall thickness value of the measurement point at the center of the weight reduction port is taken as the wall thickness value of the corresponding weight reduction port, if no, an alarm is issued.

[0026] In some embodiments of the present application, S2 further comprises the step of verifying the measured wall thickness value, specifically:

[0027] The measured wall thickness values of a plurality of measurement points are compared with the wall thickness values measured by a manual thickness gauge, if the measured wall thickness values of each corresponding measurement point deviate within a specified value, it indicates that the thickness measurement meets the use requirements, otherwise, it cannot meet the use requirements.

[0028] The present application also relates to a processing system for weight reduction of a thin-walled part, comprising:

[0029] A machine tool for weight reduction processing of the thin-walled part, the thin-walled part has a plurality of weight reduction ports on the side wall to be weight reduced;

[0030] An ultrasonic probe installed on the machine tool spindle;

[0031] A host computer for performing the following:

[0032] S1: calling a processing program for weight reduction processing of the thin-walled part;

[0033] S2: starting PCDMIS NC software and calling thickness measurement program, the machine tool controls the ultrasonic probe to touch a single point on the weight reduction grid hole while being capable of measuring the wall thickness, so that the machine tool simultaneously obtains the three-dimensional position coordinates of the touch point and the wall thickness value;

[0034] The thickness measurement program comprises a measurement point program of 3D position touch and a thickness measurement sub-program added to the measurement point program, the thickness measurement sub-program being a thickness measurement program of the ultrasonic probe, after the touch is completed, the ultrasonic probe retreats to the touch starting point;

[0035] S3: judging whether the wall thickness value and the theoretical wall thickness value are within a specified deviation range, if yes, proceeding to S5, if no, recording the current wall thickness value and obtaining the tool compensation value corresponding to each weight reduction grid hole according to the relationship between the wall thickness value and the tool compensation value and storing the tool compensation value;

[0036] S4: after calling the tool setting instrument to reset the tool, returning to S1;

[0037] S5: completing the processing.

[0038] In some embodiments of the present application, S2 further comprises:

[0039] introducing the numerical model of the thin-walled part into the PCDMIS NC software, for a plurality of measurement points on each weight reduction grid hole, a program is written in the manner of writing measurement vector points to measure the wall thickness values of the plurality of measurement points, wherein the plurality of measurement points comprise a measurement point located at the center of the weight reduction grid hole;

[0040] judging whether the wall thickness value of the measurement point located at the center of the weight reduction grid hole and the wall thickness values of the remaining measurement points are within a specified limit value, if yes, the wall thickness value of the measurement point located at the center of the weight reduction grid hole is taken as the wall thickness value of the corresponding weight reduction grid hole, if no, an alarm is issued.

[0041] In some embodiments of the present application, S2 further comprises the step of verifying the measured wall thickness value, specifically:

[0042] comparing the measured wall thickness values of the plurality of measurement points with the wall thickness values measured by the manual thickness gauge, if the deviation of the measured wall thickness values of each corresponding measurement point is within a specified value, it indicates that the thickness measurement meets the use requirement, otherwise, it cannot meet the use requirement.

[0043] Other features and advantages of the present application will become more apparent after reading the specific embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application or the prior art. Obviously, the drawings described below are some embodiments of the present application, and the other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0045] Figure 1 Flow chart of the automatic wall thickness measurement method proposed in the present application;

[0046] Figure 2 Numerical model diagram of the wall thickness part to be measured in the automatic wall thickness measurement method proposed in the present application;

[0047] Figure 3 Schematic diagram of nine measurement points selected on the numerical model diagram of the wall thickness part to be measured in the automatic wall thickness measurement method proposed in the present application;

[0048] Figure 4 Wall thickness values of the nine measurement points in a weight-reducing grid measured by the automatic wall thickness measurement method proposed in the present application;

[0049] Figure 5 Wall thickness values of the nine measurement points in a weight-reducing grid measured by the manual thickness gauge;

[0050] Figure 6 Flow chart of the thin-wall part weight-reducing machining method proposed in the present application. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0052] Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0053] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in specific circumstances. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples as appropriate.

[0054] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0055] In order to avoid the problems of low efficiency and inability to meet the subsequent processing of batch parts caused by using a manual thickness gauge to measure the wall thickness of a part, see Figure 1 The present application relates to an automatic wall thickness measurement method for a part (for example, a thin-walled part), which can realize single-point thickness measurement in any direction after introducing an ultrasonic probe UTP and a PCDMIS NC software scheme.

[0056] The automatic wall thickness measurement involved in the present application is for better application in part weight reduction processing, and therefore can be combined with a machine tool for wall thickness measurement.

[0057] There are two possible ways to collect wall thickness at present, one is to use third-party automatic equipment to detect the wall thickness of a workpiece independently of the machine tool itself; the other is to use the machine tool itself to drive a wall thickness measurement device to automatically detect the wall thickness of a workpiece.

[0058] The first way of measuring by using third-party equipment independently of the machine tool itself has problems such as large investment, space occupation, long data interaction chain, etc., and when cooperating with the machine tool for processing, the thickness detection value and tool compensation value detected by the first way are written into a text file, then read into the system through the file reading function of the machine tool processing system, and compensation processing is performed; the second way only needs to install a wall thickness measurement device to use the machine tool as a carrier to automatically measure the wall thickness of a workpiece and calculate the compensation value and write it into the system. The only device that can be installed on the spindle of the machine tool and driven by the machine tool to detect the thickness of a workpiece on the market is an ultrasonic probe RWP20.50-UTP.

[0059] Therefore, in some embodiments of the present application, the ultrasonic probe RWP20.50-UTP is used to complete the connection of hardware and the collection of wall thickness data in cooperation with a matching receiver.

[0060] It is a routine operation for using PCDMIS NC software to write a single-point measurement program, but the measurement point program generated by PCDMIS NC software can only measure the three-dimensional position coordinates of the current point, and cannot directly measure the wall thickness value of the current point.

[0061] Since the thickness measurement subprogram matched with the ultrasonic probe RWP20.50-UTP can only measure the planar thickness in the Z plane, it cannot measure the wall thickness at an arbitrary angle, but for a three-dimensional cylindrical shape such as a cabin section, how to measure the wall thickness at an arbitrary 3D point is a challenging problem.

[0062] By converting the working plane, using the thickness measurement subprogram matched with the ultrasonic probe RWP20.50-UTP to measure the wall thickness at a non-Z direction position and normally output to the variable, it is proved that the thickness measurement direction of the probe is not limited, therefore, considering using PCDMIS NC software to write a thickness measurement program of three-dimensional position coordinates, the reason is that PCDMIS NC software is a professional graphical-based measurement software, without additional programming of too much measurement loop.

[0063] Therefore, in some embodiments of the present application, the measurement point program responsible for touch measurement written by PCDMIS NC software and the thickness measurement subprogram matched with the ultrasonic probe RWP20.50-UTP are combined and improved to form a thickness measurement program that can be called in PCDMIS NC software, which can measure the wall thickness at an arbitrary angle.

[0064] As follows, the automatic wall thickness measurement method is described in combination with Figure 1 .

[0065] S11: Install the ultrasonic probe on the spindle of the machine tool.

[0066] As described above, when the part is an aerospace thin-walled part (such as a cylindrical thin-walled part of a cabin section), a five-axis machine tool needs to be used for machining, therefore, the ultrasonic probe can be installed on the spindle of the five-axis machine tool and driven by the five-axis machine tool.

[0067] The ultrasonic probe has a matched thickness measurement subprogram for thickness measurement of the current point.

[0068] In some embodiments of the present application, the working principle of the ultrasonic probe is described as follows.

[0069] After the probe touches the calibration block with a known thickness, it will emit and receive ultrasonic waves at the same time, and the propagation speed of the ultrasonic wave in the material is calculated by dividing the known distance of ultrasonic transmission by the time difference between emission and reception, and written into a variable for later use.

[0070] When the part is measured by the ultrasonic probe, the time difference between the emission and the reception of the ultrasonic wave can still be directly obtained by the probe, and the propagation speed of the ultrasonic wave in the material has been obtained through calibration, so the thickness of the workpiece to be measured is obtained by multiplying the speed by the time and dividing by two.

[0071] S12: Start the PCDMIS NC software, call the thickness measurement program, and control the ultrasonic probe to touch a single point on the part and measure the wall thickness of the touch point at the same time, so that the three-dimensional position coordinates and the wall thickness value of the touch point are obtained by the machine tool at the same time.

[0072] In some embodiments of the present application, the touch point program written by the PCDMIS NC software can realize the touch of any 3D point and obtain the three-dimensional position coordinates of the touch point.

[0073] The touch has a touch sequence, first positioning to a position several millimeters away from the target point (as the starting position), then touching the target point, retreating to the starting point after touching the target point, and then touching the next point.

[0074] In the present application, the thickness measurement program is written by the PCDMIS NC software, which includes the above-mentioned touch point program and the thickness measurement sub-program added to the touch point program, that is, the thickness measurement program matched with the probe is added after the touch, so as to realize the wall thickness measurement at the same time of the touch.

[0075] When the thickness measurement program is executed, first positioning to a position several millimeters away from the target point (as the starting position), then touching the target point and measuring the wall thickness, retreating to the starting point after touching and obtaining the wall thickness value, and then touching the next point.

[0076] In some embodiments of the present application, since the touch point program written by the PCDMIS NC software is a 3D touch point and the thickness measurement program is added on this basis, the thickness measurement at any angle of the 3D point can be realized.

[0077] In the touch point program, the three-dimensional coordinates of the current starting point are assigned to the retreat target position coordinates, so as to facilitate the retreat of the ultrasonic probe to the starting point after the touch is completed, and the starting point position coordinates are three-dimensional coordinates.

[0078] In some embodiments of the present application, the purpose of the wall thickness measurement in the present application is to reduce the weight of the part, so a plurality of weight reduction openings (for example, square weight reduction openings) are formed on the side wall of the part to be reduced in weight. These weight reduction openings are designed for weight reduction and are processed one by one on the part.

[0079] Referring to Figure 2 , which shows that the part is a cylindrical thin-walled cabin section and a plurality of weight reduction openings on the inner side wall to be reduced in weight.

[0080] In order to accurately measure the wall thickness and achieve the accuracy of weight reduction, the wall thickness of several measuring points on each weight reduction opening is measured, and the several measuring points need to include a measuring point located at the center of the weight reduction opening.

[0081] Referring to Figure 3 , which shows nine measuring points on one weight reduction opening of a cylindrical thin-walled part of a cabin section, the nine measuring points are arranged in three rows and three columns in the weight reduction opening, and the eight measuring points around the centermost measuring point are used for comparison results.

[0082] In some embodiments of the present application, the wall thickness value of the weight reduction opening is obtained as follows.

[0083] The numerical model of the part is imported into the PCDMIS NC software, and for each measuring point of each weight reduction opening, a program is written according to the method of writing measurement vector points to measure the wall thickness values of each measuring point of each weight reduction opening.

[0084] It is judged whether the wall thickness value of the centermost measuring point of the weight reduction opening and the wall thickness values of the remaining measuring points are within the specified limit value, if yes, the wall thickness value of the centermost measuring point of the weight reduction opening is taken as the wall thickness value of the corresponding weight reduction opening, if no, an alarm is issued.

[0085] Referring to Figure 4 , in Figure 3 , when there are nine measuring points on one weight reduction opening, the wall thickness values of the nine measuring points are automatically obtained.

[0086] It is judged whether the wall thickness value of the centermost measuring point (i.e. 5) of the weight reduction opening and the wall thickness values of the remaining measuring points (i.e. 1, 2, 3, 4, 6, 7, 8, 9) are within the specified limit value, if yes, the wall thickness value of the centermost measuring point of the weight reduction opening is taken as the wall thickness value of the corresponding weight reduction opening, if no, an alarm is issued.

[0087] In some embodiments of the present application, the automatic wall thickness measurement method further includes a step of verifying the measured wall thickness value, which is as follows.

[0088] Referring to Figure 5 , which also shows that the wall thickness values of the nine measuring points on one weight reduction opening shown in Figure 3 are measured by using a manual thickness gauge.

[0089] In the process of verifying the wall thickness values measured by the automatic wall thickness method, the measured wall thickness values of the nine measuring points are compared with the wall thickness values measured by the manual thickness gauge respectively (for example, Figure 4 measuring point 1 in Figure 5If the deviation of the wall thickness value measured by the corresponding measuring point is within the specified value, it indicates that the thickness measurement meets the use requirements, otherwise, it cannot meet the use requirements, that is, the automatically measured wall thickness value cannot meet the requirements of subsequent part weight reduction processing, and the problem needs to be found out.

[0090] Referring to Figure 5 The deviation between the results measured by the manual thickness gauge and the automatic thickness measurement using the ultrasonic probe UTP is within 0.02 mm, which meets the use requirements.

[0091] After rough machining of the aerospace thin-walled part and before finish machining, the thin-walled part needs to be weight-reduced, and the wall thickness of the thin-walled part needs to be measured during weight reduction processing. The automatically measured wall thickness value is automatically read into the variable corresponding to the tool compensation value through a macro program, wherein the tool compensation value for each weight reduction port is stored by independent variable.

[0092] The thickness deviation value is obtained by subtracting the wall thickness value from the theoretical wall thickness value. The customer can provide a preset relationship between the thickness deviation value and the tool compensation value and use a macro program to automatically calculate the formula, so that the tool compensation value can be obtained through the macro program after the wall thickness value is measured.

[0093] Referring to Figure 6 It shows a flowchart of the aerospace thin-walled part weight reduction machining method.

[0094] S1: The machine tool calls the machining program for weight reduction machining of the thin-walled part.

[0095] As described above, when the thin-walled part is weight-reduced, the machining program needs to be called and started by the machine tool.

[0096] The thin-walled part here can refer to a three-dimensional cylindrical shell of a cabin section, and the machining program performs a weight reduction machining process.

[0097] Before executing the machining program, the hardware, software, and required variables used for machining should be configured.

[0098] S2: Start the PCDMIS NC software and call the thickness measurement program. The machine tool controls the ultrasonic probe to touch a single point on the weight reduction port while also performing thickness measurement, so that the machine tool can obtain the three-dimensional position coordinates and the wall thickness value of the touch point at the same time.

[0099] In this application, the thickness measurement program is written by using the PCDMIS NC software, which includes the above measuring point program and the thickness measurement sub-program added to the measuring point program, that is, the thickness measurement program matched with the ultrasonic probe RWP20.50-UTP is added after the touch, so that the wall thickness measurement is realized at the same time as the touch.

[0100] During the thickness measurement procedure, firstly, a position several millimeters away from the target point is located as a starting point, then the target point is touched and the thickness is measured, after the wall thickness value is obtained, the starting point is returned to and the next point is touched.

[0101] In some embodiments of the present application, since the measurement point procedure written by the PCDMIS NC software is a 3D measurement point and the thickness measurement procedure is added on this basis, the thickness measurement at any angle of the 3D point can be realized.

[0102] In the measurement point procedure, the three-dimensional coordinates of the current starting point are assigned to the return target position coordinates, so that after the touching is completed, the ultrasonic probe is returned to the starting point, and the starting point position coordinates are three-dimensional coordinates.

[0103] S3: determining whether the wall thickness value and the theoretical wall thickness value are within a specified deviation range, if yes, proceeding to S5, if no, recording the current wall thickness value and obtaining the tool compensation value corresponding to each weight reduction port according to the relationship between the wall thickness value and the tool compensation value and storing.

[0104] In some embodiments of the present application, during the machining process, a theoretical wall thickness value is set for each vibration reduction port, and the obtained wall thickness value is compared with the theoretical wall thickness value, if the wall thickness value and the theoretical wall thickness value are within a specified deviation range, proceeding to S5, indicating that the machining is completed.

[0105] If the wall thickness value and the theoretical wall thickness value are not within a specified deviation range, it indicates that the current thickness is still thick and needs to be weight-reduced, therefore, the current wall thickness value is recorded (for example, the wall thickness value can be automatically written into a corresponding system custom variable) and the relationship between the wall thickness value and the tool compensation value is obtained.

[0106] This relationship can be a calculation formula determined by the customer according to the actual requirements, and mathematical calculation can be performed in the macro program, for example, if the thickness difference is 0.04 mm, the tool compensation value needs to be reduced by 0.04 mm to be machined in place, in fact, the tool compensation value calculation needs to be automatically calculated according to the actual situation of the customer in the macro program.

[0107] Then, the compensation is performed according to the updated tool compensation value and then the machining is performed.

[0108] It should be noted that the tool compensation value is a tool parameter required during the machining of the numerical control machine tool, and common tool parameters include tool length L and tool diameter R, in a simple way, the tool length L affects the depth of the machined part during machining, and the tool diameter R affects the size during machining, the tool length L includes shape and wear, and the tool diameter R also includes shape and wear, and different tool numbers are often used for compensation of the column where the wear is located for wall thickness weight reduction machining.

[0109] S4: after calling the tool setter to retool, returning to S1;

[0110] The tool setting instrument is a device for adjustment of a tool.

[0111] In the machining process of the workpiece, the auxiliary time such as workpiece loading and unloading and tool adjustment accounts for a considerable proportion in the machining cycle, wherein the tool adjustment is not only time-consuming and laborious, but also not easy to be accurate, and finally needs trial cutting. Therefore, the tool setting instrument shows great superiority in the machining process of the workpiece.

[0112] The tool setting process of the tool setting instrument belongs to the prior art, and will not be described here.

[0113] After the tool setting instrument is re-set, the weight-reducing machining is performed on the weight-reducing hole that does not meet the requirements until the requirements are met and the machining is completed.

[0114] S5: Machining is completed.

[0115] At this point, the weight-reducing machining process is completed.

[0116] The machining method disclosed in the present application can automatically measure the three-dimensional position coordinates of the target point and the wall thickness value, and automatically calculate the compensation value of the tool and automatically process by using the measured wall thickness value, which makes good preparation for future full-automatic loading and unloading, and realizes full-automatic and non-human intervention high-efficiency and high-precision machining from the wall thickness measurement to the calculation of the tool compensation value and the automatic compensation machining, fundamentally solves the problems of low measurement efficiency and low machining efficiency, and achieves the expected goal of one-key full-automatic measurement to finished product of the customer.

[0117] Moreover, the machining method fully meets the expectation of the user to realize one-time clamping full-automatic machining, avoids human error in manual measurement and recording and time consumption in manual input of the measurement value into the machining system, greatly improves the automation level and machining efficiency of the user production, and the production efficiency of the machining method for the parts is improved by more than 60%.

[0118] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An automatic wall thickness measurement method, characterized in that, include: An ultrasonic probe is mounted on the spindle of a machine tool, which is used to perform weight reduction processing on thin-walled parts. The thin-walled parts have multiple weight reduction slots on their sidewalls to be weighted. Start the PCDMIS NC software, import the digital model of the thin-walled part into the PCDMIS NC software, write a program for several measurement points of each weight reduction grid according to the method of writing measurement vector points, and call the thickness measurement program respectively. The machine tool controls the ultrasonic probe to perform touch testing on each measurement point and can also measure the wall thickness of the touch point, so that the machine tool can simultaneously obtain the three-dimensional position coordinates and wall thickness value of the touch point. The wall thickness values ​​measured at the several measurement points are compared with the wall thickness values ​​measured by a manual thickness gauge. If the deviation of the wall thickness values ​​measured at each corresponding measurement point is within the specified value, it indicates that the wall thickness measurement meets the usage requirements; otherwise, it does not meet the usage requirements. After the wall thickness values ​​at each measurement point meet the usage requirements, it is determined whether the wall thickness value at the measurement point at the center of the weight-reducing grid and the wall thickness values ​​at the remaining measurement points are within the specified limits. If yes, the wall thickness value at the measurement point at the center of the weight-reducing grid is used as the wall thickness value of the corresponding weight-reducing grid. If no, an alarm prompt is issued. The thickness measurement program includes a 3D position touch measurement point program and a thickness measurement subroutine added to the measurement point program. The thickness measurement subroutine is a built-in program of the ultrasonic probe for thickness measurement. After the touch measurement is completed, the ultrasonic probe returns to the touch measurement starting point. Several measurement points include a measurement point located at the center of the weight reduction grid.

2. A processing method for reducing the weight of a thin-walled part, wherein the sidewall of the thin-walled part to be weight-reduced has a plurality of weight-reduction slots, characterized in that, The processing method includes: S1: The machine tool calls the machining program to perform weight reduction machining on the thin-walled part; S2: Start the PCDMIS NC software, import the digital model of the thin-walled part into the PCDMIS NC software, write a program for several measurement points of each weight reduction grid according to the method of writing measurement vector points, and call the thickness measurement program. The machine tool controls the ultrasonic probe to perform touch testing on each measurement point and can also perform wall thickness measurement, so that the machine tool can simultaneously obtain the three-dimensional position coordinates and wall thickness value of the touch point. The ultrasonic probe is mounted on the machine tool spindle. The thickness measurement program includes a 3D position touch measurement point program and a thickness measurement subroutine added to the measurement point program. The thickness measurement subroutine is a built-in program for thickness measurement of the ultrasonic probe. After the touch measurement is completed, the ultrasonic probe returns to the touch measurement starting point. S2': Compare the measured wall thickness values ​​at the several measurement points with the wall thickness values ​​measured by a manual thickness gauge. If the deviation of the measured wall thickness values ​​at each corresponding measurement point is within the specified value, it indicates that the wall thickness measurement meets the usage requirements, and proceed to S3. Otherwise, it does not meet the usage requirements, and the problem needs to be identified. S3: Determine whether the wall thickness value is within the specified deviation range from the theoretical wall thickness value. If yes, proceed to S5. If no, record the current wall thickness value and obtain and store the corresponding blade compensation value for each weight reduction grid based on the wall thickness value and its relationship with the blade compensation value. S4: After calling the tool setter to re-set the tool, return to S1; S5: Processing complete.

3. A processing system for reducing the weight of thin-walled parts, characterized in that, include: A machine tool for performing weight reduction processing on the thin-walled part, wherein the thin-walled part has multiple weight reduction slots on the side wall to be weighted; An ultrasonic probe is mounted on the machine tool spindle. The host computer is used to execute the following: S1: Call the machining program for weight reduction of thin-walled parts; S2: Start the PCDMIS NC software and import the digital model of the thin-walled part into the PCDMIS NC software. For several measurement points of each weight reduction grid, write the program according to the method of writing measurement vector points, and call the thickness measurement program respectively. The machine tool controls the ultrasonic probe to perform touch testing on each measurement point and can also perform wall thickness measurement, so that the machine tool can simultaneously obtain the three-dimensional position coordinates and wall thickness value of the touch point. The thickness measurement program includes a 3D position touch measurement point program and a thickness measurement subroutine added to the measurement point program. The thickness measurement subroutine is a built-in program of the ultrasonic probe for thickness measurement. After the touch measurement is completed, the ultrasonic probe retracts from the touch measurement starting point. S2': Compare the measured wall thickness values ​​at the several measurement points with the wall thickness values ​​measured by a manual thickness gauge. If the deviation of the measured wall thickness values ​​at each corresponding measurement point is within the specified value, it indicates that the wall thickness measurement meets the usage requirements, and proceed to S3. Otherwise, it does not meet the usage requirements, and the problem needs to be identified. S3: Determine whether the wall thickness value is within the specified deviation range from the theoretical wall thickness value. If yes, proceed to S5. If no, record the current wall thickness value and obtain and store the corresponding blade compensation value for each weight reduction grid based on the wall thickness value and its relationship with the blade compensation value. S4: After calling the tool setter to re-set the tool, return to S1; S5: Processing complete.

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