Precision forging blade edge grinding model construction method and system

Abstract

The invention provides a precision forging blade edge grinding model construction method and system. The method comprises the steps that the total arc length of each section of the blade edge is divided into a middle arc section and transition sections on the two sides; measuring the length of a middle arc on each section, and setting the total arc length according to the measured length of the middle arc, so that the middle arc section and the transition sections on the two sides meet a preset proportional relation; and generating a curve of each section based on the proportional relation corresponding to the set total arc length, and carrying out modeling through the curves to generate a final blade edge grinding model. By adopting the construction method of the blade edge grinding model provided by the invention to carry out numerical control grinding processing on the blade edge, the problems of insufficient grinding, excessive grinding, insufficient grinding or relatively low processing precision and the like caused by non-uniform distribution of the blade edge during grinding can be solved to a great extent.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-temperature alloy blade processing, and in particular relates to a method and system for constructing a precision forging blade edge grinding model. Background Art

[0002] The inlet and exhaust edges of aircraft engine blades are the transition areas connecting the blade basin and the blade back. This area is approximately a complex convex surface in the shape of a narrow cylinder. The geometric shape and dimensional accuracy of the blade's inlet and exhaust edges have an important impact on the blade's aerodynamic performance. At present, the polishing process of the inlet and exhaust edges of high-pressure blades is mainly carried out by CNC belt grinding and polishing. Due to the small size of high-pressure blades, thin blade bodies, small radius R of the inlet and exhaust edges, and uneven distribution along the cross section, they are greatly deformed during processing. As a result, the grinding process often has problems such as inadequate grinding, over-grinding, under-grinding, or low processing accuracy. Due to the differences in the raw materials themselves, it is difficult to completely solve these problems with the current blade edge belt grinding, and subsequent manual polishing processes are often required to repair them. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and system for constructing a precision forging blade edge grinding model to solve the problems of insufficient grinding, over-grinding, under-grinding or low machining accuracy caused by uneven distribution of blade edge radius.

[0004] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a method for constructing a precision forging blade edge grinding model, comprising: Divide the total arc length of each section of the blade edge into a middle arc segment and transition segments on both sides; Measure the length of the middle arc on each section, and set the total arc length based on the measured length of the middle arc so that the middle arc segment and the transition segments on both sides meet the preset proportional relationship; Based on the proportional relationship corresponding to the total arc length, curves of each section are generated, and modeling is performed through the curves to generate the final blade edge grinding model.

[0005] Furthermore, the total arc length of each cross section of the blade edge is divided into a middle arc segment and transition segments on both sides, including: The total arc length of each section of the blade edge is divided into three structural areas: a, b, and c. Area a is the arc length of each section of the blade, area b is the transition area of ​​the blade basin side, and area c is the transition area of ​​the blade back side. Areas b and c are connected at both ends of area a.

[0006] Furthermore, measuring the length of the middle arc on each cross section includes: Use a three-coordinate measuring machine or an optical scanner to measure and record the length of the middle arc of each section.

[0007] Furthermore, the total arc length is set according to the measured length of the middle arc so that the middle arc segment and the transition segments on both sides meet a preset proportional relationship, including: Total arc length = middle arc + length of transition sections on both sides The middle arc = the length of the transition sections on both sides, and the lengths of the transition sections on both sides are equal.

[0008] Furthermore, the curves of each cross section are generated based on the proportional relationship corresponding to the total arc length, and the final blade edge grinding model is generated by modeling through the curves, including: Based on the divided areas and the set proportional relationship, the curves of each section are obtained and summarized into a curve group. The curve group is used to perform geometric modeling on each section to generate a continuous grinding model of the blade edge.

[0009] Furthermore, the geometric modeling of each cross section using a curve group includes: Based on the measured values ​​of each section, the arc length a, transition zone b and c, satisfying a=2b=2c, a complete closed contour curve of each section is generated; Use the center of gravity or chord direction of the section as the alignment point and ensure that the Z axes of all sections are parallel by matching the coordinate systems. Perform constant arc length parameterization on each contour curve; Select each section profile curve in sequence to generate a continuous surface.

[0010] Furthermore, the grinding model is used to generate a grinding tool path extending from the root to the tip of the blade, and during the edge grinding process, the root and the tip are synchronously ground to the same position.

[0011] In a second aspect, the present invention provides a system for constructing a precision forging blade edge grinding model, comprising: A region division module is used to divide the total arc length of each cross section of the blade edge into a middle arc segment and transition segments on both sides; The measurement module is used to measure the length of the middle arc on each cross section and set the total arc length according to the measured length of the middle arc so that the middle arc segment and the transition segments on both sides meet the preset proportional relationship; The model building module is used to generate curves of each section based on the proportional relationship corresponding to the set total arc length, and to generate the final blade edge grinding model through modeling through the curves.

[0012] In a third aspect, the present invention provides a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for constructing a precision forging blade edge grinding model when executing the computer program.

[0013] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method for constructing a precision forging blade edge grinding model.

[0014] Compared with the prior art, the present invention has the following technical effects: The blade edge grinding model construction method provided by the present invention is used to perform CNC grinding of the blade edge, which can, to a large extent, solve the problems of uneven distribution of the blade edge, resulting in insufficient grinding, over-grinding, under-grinding or low processing accuracy during grinding. It not only improves the surface quality of the blade and reduces potential fault hazards, but also reduces the subsequent polishing workload and the number of reworks, reduces program debugging time, shortens the processing cycle, saves costs, and improves the efficiency and stability of the grinding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a cross section of the edge of a blade of a certain machine for high-pressure precision forging to which the present invention is applied.

[0016] Figure 2 This is a schematic diagram of the grinding model of the air inlet edge of a high-pressure precision forged blade of a certain machine used in the present invention.

[0017] Figure 3 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0018] The present invention is further described below with reference to the accompanying drawings: Example 1, please refer to Figure 3 The present invention provides a method for constructing a precision forging blade edge grinding model, comprising: Divide the total arc length of each section of the blade edge into a middle arc segment and transition segments on both sides; Measure the length of the middle arc on each section, and set the total arc length based on the measured length of the middle arc so that the middle arc segment and the transition segments on both sides meet the preset proportional relationship; Based on the proportional relationship corresponding to the total arc length, curves of each section are generated, and modeling is performed through the curves to generate the final blade edge grinding model.

[0019] The original method of constructing the blade edge model was changed, and a new processing method was adopted to grind the blade intake and exhaust edges. This method solved to a certain extent the problems of inadequate grinding, over-grinding, under-grinding or low processing accuracy caused by uneven distribution of blade edge radius, thereby ensuring the edge grinding quality of the blade and improving the grinding efficiency.

[0020] In Example 2, the present invention provides a method for constructing a precision forging blade edge grinding model, specifically comprising: The total arc length of each section of the blade edge is divided into three regions: a, b, and c (e.g. Figure 1 As shown in the figure, area a is the arc length of each blade section, area b is the transition area on the blade basin side, and area c is the transition area on the blade back side. The model is constructed by area. The construction method is to set the a, b, and c areas of each section of the blade edge in equal proportions. The corresponding length values ​​satisfy the following formula: a=2b=2c After the sections of the blade edge model are constructed using this method, Figure 2 The grinding path from the root of the blade to the tip of the blade can ensure that the root and the tip are ground to the same position on the edge at the same time during the grinding process.

[0021] The high-pressure rotor blades of a certain level of a certain machine are precision forgings, consisting of a tenon, a blade body, an inlet edge, and an exhaust edge. The main steps in constructing the edge grinding model of this type of blade are: (1) Divide the structural area: Divide the total arc length of each section of the blade edge into three structural areas: a, b, and c, where a is the arc length of each section of the blade, b is the transition area of ​​the blade basin side, and c is the transition area of ​​the blade back side. The specific division areas are as follows: Figure 1 shown.

[0022] (2) Measure the length of the arc on each section and record it. (See Table 1) (3) Set the arc length of each section. (See Table 1) When a of the 0-0 section is 0.25, b and c are 0.125 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0023] When a of section 1-1 is 0.24, b and c are 0.12 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0024] When a of section 2-2 is 0.24, b and c are 0.12 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0025] When section a is 0.25, b and c are 0.125 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0026] When a of section 4-4 is 0.29, b and c are 0.145 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0027] When a of section 5-5 is 0.25, b and c are 0.125 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0028] When a of section 6-6 is 0.26, b and c are 0.13 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0029] When a of section 7-7 is 0.34, b and c are 0.17 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0030] When a of section 8-8 is 0.56, b and c are 0.28 respectively, and the ratio of the transition area value on the back of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0031] When a of section 9-9 is 0.94, b and c are 0.47 respectively, and the ratio of the transition area value on the dorsal side of the basin to the arc length is 1:1, accounting for 1 / 2 of the total arc length.

[0032] (4) Model each section through the curve group to generate the final blade edge grinding model.

[0033] Table 1

[0034] In yet another embodiment of the present invention, a system for constructing a precision forging blade edge grinding model is provided, which can be used to implement the above-mentioned method for constructing a precision forging blade edge grinding model. Specifically, the system includes: A region division module is used to divide the total arc length of each cross section of the blade edge into a middle arc segment and transition segments on both sides; The measurement module is used to measure the length of the middle arc on each cross section and set the total arc length according to the measured length of the middle arc so that the middle arc segment and the transition segments on both sides meet the preset proportional relationship; The model building module is used to generate curves of each section based on the proportional relationship corresponding to the set total arc length, and to generate the final blade edge grinding model through modeling through the curves.

[0035] The module division in the embodiments of the present invention is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in various embodiments of the present invention may be integrated into a single processor, exist physically as separate modules, or two or more modules may be integrated into a single module. The integrated modules may be implemented in either hardware or software functional modules.

[0036] In another embodiment of the present invention, a computer device is provided, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of a method for constructing a precision forging blade edge grinding model.

[0037] In another embodiment of the present invention, a storage medium is provided, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a computer device, used to store programs and data. It is understood that the computer-readable storage medium herein may include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides storage space, which stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for being loaded and executed by a processor. These instructions may be one or more computer programs (including program code). It should be noted that the computer-readable storage medium herein may be high-speed RAM memory or non-volatile memory, such as at least one disk storage device. The processor may load and execute the one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the method for constructing a precision forging blade edge grinding model in the above-mentioned embodiment.

[0038] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0039] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0040] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0041] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for constructing a grinding model for a precision forged blade edge, characterized in that: include: Divide the total arc length of each section of the blade edge into a middle arc segment and transition segments on both sides; Measure the length of the middle arc on each section, and set the total arc length based on the measured length of the middle arc so that the middle arc segment and the transition segments on both sides meet the preset proportional relationship; Based on the proportional relationship corresponding to the total arc length, curves of each section are generated, and modeling is performed through the curves to generate the final blade edge grinding model.

2. The method for constructing a precision forging blade edge grinding model according to claim 1, characterized in that: The method of dividing the total arc length of each cross section of the blade edge into a middle arc segment and transition segments on both sides includes: The total arc length of each section of the blade edge is divided into three structural areas: a, b, and c. Area a is the arc length of each section of the blade, area b is the transition area of ​​the blade basin side, and area c is the transition area of ​​the blade back side. Areas b and c are connected at both ends of area a.

3. The method for constructing a precision forging blade edge grinding model according to claim 1, characterized in that: The measuring of the length of the middle arc on each cross section includes: Use a three-dimensional coordinate measuring machine or an optical scanner to measure and record the length of the middle arc of each section.

4. The method for constructing a precision forging blade edge grinding model according to claim 1, wherein: The method of setting the total arc length according to the measured length of the middle arc so that the middle arc segment and the transition segments on both sides meet a preset proportional relationship includes: Total arc length = middle arc + length of transition sections on both sides The middle arc = the length of the transition sections on both sides, and the lengths of the transition sections on both sides are equal.

5. The method for constructing a precision forging blade edge grinding model according to claim 1, characterized in that: The method of generating curves of each cross section based on the proportional relationship corresponding to the total arc length, modeling the curves, and generating a final blade edge grinding model includes: Based on the divided areas and the set proportional relationship, the curves of each section are obtained and summarized into a curve group. The curve group is used to perform geometric modeling on each section to generate a continuous grinding model of the blade edge.

6. The method for constructing a precision forging blade edge grinding model according to claim 1, characterized in that: The geometric modeling of each cross section by using a curve group includes: Based on the measured values ​​of each section, the arc length a, transition zone b and c, satisfying a=2b=2c, a complete closed contour curve of each section is generated; Use the center of gravity or chord direction of the section as the alignment point and ensure that the Z axes of all sections are parallel by matching the coordinate systems. Perform constant arc length parameterization on each contour curve; Select each section profile curve in sequence to generate a continuous surface.

7. The method for constructing a precision forging blade edge grinding model according to claim 5, characterized in that: The grinding model is used to generate a grinding tool path extending from the root to the tip of the blade. During the edge grinding process, the root and the tip are synchronously ground to the same position.

8. A precision forging blade edge grinding model construction system, characterized in that: include: A region division module is used to divide the total arc length of each cross section of the blade edge into a middle arc segment and transition segments on both sides; The measurement module is used to measure the length of the middle arc on each cross section and set the total arc length according to the measured length of the middle arc so that the middle arc segment and the transition segments on both sides meet the preset proportional relationship; The model building module is used to generate curves of each section based on the proportional relationship corresponding to the set total arc length, and to generate the final blade edge grinding model through modeling through the curves.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method for constructing a precision forging blade edge grinding model as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for constructing a precision forging blade edge grinding model as claimed in any one of claims 1 to 7 are implemented.

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