A multi-axis one-time multi-piece milling method for aviation thin-walled parts

Abstract

The present invention discloses a multi-axis one-time milling method for multiple pieces of aviation thin-walled parts. By improving the tool path, the milling cutter can directly perform fine milling after rough milling at the same position, thereby maintaining the original rigidity of the blank to the greatest extent, avoiding the defect of serious decrease in overall rigidity after large-area rough milling of the blank in the traditional method, which is prone to tool chattering during subsequent fine milling, and reducing the influence of tool chattering during the machining of thin-walled parts, so that thinner sizes can be machined. At the same time, based on the improvement of the tool path, the overall size of the process boss is made small enough through the provision of an additional machining area, especially the thickness of the process boss can be machined to be thin enough, thereby facilitating the separation of the previous thin-walled part, and at the same time, the small-sized process boss can greatly reduce material loss.

Description

Technical Field

[0001] The invention relates to the field of multi-axis machine tool processing, and more specifically to a multi-axis aviation thin-walled parts one-time multi-piece numerical milling processing method. Background Art

[0002] like Figure 1 As shown, in traditional thin-walled parts, when multiple pieces are processed at a time, the blank needs to be installed by means of a pressing plate. However, the installation method using a pressing plate easily produces a large area of ​​connection area, which needs to be removed by multiple-step cooperation with special bench tools, resulting in a very complicated process and inability to achieve automated clamping and automatic production.

[0003] When the blank is clamped in a self-centering center vise to process thin-walled parts, since the blank is placed vertically, the traditional machining tool path will perform overall rough milling during processing, resulting in a serious decrease in overall rigidity after the rough milling is completed, and tool chattering is prone to occur during subsequent fine milling. At the same time, due to the influence of decreased rigidity and tool chattering, a thick process boss will inevitably be left between the previous thin-walled part and the blank after processing is completed, which will make separation difficult and make it impossible to achieve multiple-piece processing at one time. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention improves the tool path and reduces the impact of the tool chattering on the process boss, thereby obtaining a thinner process boss, which is convenient for separation after the previous thin-walled part is completed, thereby reducing the blank size and the overall processing time.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-axis aviation thin-walled part one-time multi-piece CNC milling method, the thin-walled part includes a web and integrally formed vertical ribs, the blank is clamped and fixed on the machine tool operating surface by a center vise, a first processing area and a second processing area are formed on both sides of the blank, the first processing area and the second processing area are arranged up and down, and a process boss is formed between the first processing area and the second processing area;

[0006] The second processing area processing step comprises:

[0007] S1. Determine the arrangement of multiple thin-walled parts on the blank, so as to determine the position of the process boss;

[0008] S2, select tool size and feed amount;

[0009] S3, performing a rough milling with the selected feed amount;

[0010] S4, performing fine milling on the thin-walled part contour formed after rough milling to a predetermined size;

[0011] S5, repeat steps S3 and S4, and keep the last cut;

[0012] S6. Process the last cut and lift along the tool axis to form an additional processing area at the end of the processing. The additional processing area is a side surface of the process boss, and at the same time, a contour surface processing of the thin-walled part is completed.

[0013] As a further improvement of the present invention, the first processing area processing step includes:

[0014] (1) Select tool size and feed amount;

[0015] (2) Perform a rough milling operation with the selected feed amount;

[0016] (3) fine milling the contour of the thin-walled part 1 formed after rough milling to a predetermined size;

[0017] (4) Repeat steps S3 and S4, and the last cut is only rough milling to form the other side of the process boss.

[0018] As a further improvement of the present invention, the processing order of the first processing area and the second processing area can be interchanged, and the S6 is the last cut in the thin-walled part processing step.

[0019] As a further improvement of the present invention, the thickness of the process boss is 0.1mm-0.25mm.

[0020] As a further improvement of the present invention, the tool diameter in S2 is D=16 mm, the bottom R=0.5, the radial feed AP=40 mm, and the lateral AE=1.5 mm.

[0021] As a further improvement of the present invention, the lifting value in S5 is 0.1 mm.

[0022] As a further improvement of the present invention, after the rough milling in S3 is completed, a finishing allowance of 0.5 mm is reserved.

[0023] As a further improvement of the present invention, adjacent thin-walled parts are relatively rotated 180 degrees and leave a gap.

[0024] As a further improvement of the present invention, adjacent thin-walled members are arranged in an up-down staggered manner.

[0025] As a further improvement of the present invention, the minimum thickness of the thin-walled part is 1.27 mm.

[0026] Beneficial effects of the present invention:

[0027] 1. Through the improvement of tool path, the milling cutter can directly carry out fine milling after rough milling at the same position, so as to maintain the original rigidity of the blank to the greatest extent, and avoid the serious decrease in overall rigidity after large-area rough milling of the blank in the traditional way, which is easy to cause the defect of tool chattering in the subsequent fine milling, so that the influence of tool chattering is reduced during the processing of thin-walled parts, so that thinner sizes can be processed;

[0028] 2. On the basis of the improvement of the tool path, the overall size of the process boss is made small enough by setting up an additional processing area, especially the thickness of the process boss can be processed to be thin enough, so as to facilitate the separation of the previous thin-walled part. At the same time, the small-sized process boss can greatly reduce material loss;

[0029] 3. The process boss formed after processing is a whole shape, so that the strength of the connection between the process boss and the thin-walled part is consistent, and at the same time, the connection stability of the process boss to the thin-walled part can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the flat installation of the blank in the prior art;

[0031] Figure 2 It is a schematic diagram of the arrangement of multiple thin-walled parts according to the first embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a machining tool path according to a first embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the arrangement of two thin-walled parts in the second embodiment of the present invention;

[0034] Figure 5 Schematic diagram of machining tool path of the second embodiment of the present invention.

[0035] Figure numerals: 1, thin-walled part; 2, blank; 3, first processing area; 4, second processing area; 5, web; 6, vertical rib; 7, process boss. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are represented by the same reference numerals.

[0037] Figure 2-3The first embodiment of the present invention is a multi-axis aviation thin-walled part one-time multi-piece milling method, the thin-walled part 1 includes a web 5 and an integrally formed vertical rib 6. In this embodiment, the vertical rib 6 is arranged corresponding to the upper end of the web 5. The size of the blank 2 is 171mm×57.15mm×285mm, the maximum outer contour size of the thin-walled part 1 is 164.59mm×46.21mm×42.93mm, and the minimum thickness is 1.27mm. The blank 2 is clamped and fixed on the machine tool operating surface by a center vise. A first processing area 3 and a second processing area 4 are formed on both sides of the blank 2. The first processing area 3 and the second processing area 4 are arranged up and down, and a process boss 7 is formed between the first processing area 3 and the second processing area 4. In this embodiment, the first processing area 3 is the corresponding surface on the left side of the web 5, and the second processing area 4 is the corresponding surface on the bottom of the web 5;

[0038] The processing steps of the second processing area 4 include:

[0039] S1. Determine the arrangement of multiple thin-walled parts 1 on the blank 2, so as to determine the position of the process boss 7. In this embodiment, adjacent thin-walled parts are rotated 180 degrees relative to each other, with a spacing of 3 mm, and are arranged and processed with a 2 mm offset from top to bottom;

[0040] S2. Select the tool size and feed amount. In this embodiment, the tool diameter is D=16 mm, the bottom R=0.5, the radial feed amount AP=40 mm, and the lateral feed amount AE=1.5 mm;

[0041] S3, perform a rough milling with the selected feed amount, so that the bottom finishing allowance is 0.5mm;

[0042] S4, performing fine milling on the contour of the thin-walled part 1 formed after rough milling to a predetermined size;

[0043] S5, repeat steps S3 and S4, and keep the last cut;

[0044] The first processing area 3 processing steps include:

[0045] (1) Select the tool size and feed amount. In this embodiment, the tool diameter is D = 16 mm, the bottom R = 3, the roughing radial feed amount AP = 2 mm, and the lateral AE = 16 mm;

[0046] (2) Perform a rough milling with the selected feed amount so that the bottom finishing allowance is 0.5 mm;

[0047] (3) fine milling the contour of the thin-walled part 1 formed after rough milling to a predetermined size;

[0048] (4) Repeat steps (2) and (3), with the last cut being only rough milling.

[0049] The processing order of the first processing area 3 and the second processing area 4 can be interchanged. In this embodiment, the last processing amount retained in the first processing area 3 is rough milled according to the selected tool size, specifically the tool size selected in (1), so as to form the other side of the process boss 7. After the processing is completed, the processing step S6 is performed, and the processing step S6 includes:

[0050] S6, the last cut in the second processing area 4 is processed. The processing amount of the last cut is the same as that of S2. At the same time, it is lifted by 0.1 mm along the tool axis direction, so that an additional processing area is formed at the processing end point. The additional processing area is a side surface of the process boss 7, and at the same time, a contour surface processing of the thin-walled part 1 is completed.

[0051] Preferably, the minimum thickness of the process boss 7 is 0.1 mm-0.25 mm. In this embodiment, the minimum thickness of the process boss 7 is 0.2 mm.

[0052] Figure 4-5 This is the second embodiment of the present invention, which is different from the first embodiment in that the vertical rib 6 is arranged corresponding to the lower end of the web 5, so that the first processing area 3 is the area corresponding to the left side of the web 5, and the second processing area 4 is the area corresponding to the lower side of the vertical rib 6. The size of the blank 2 is 520mm×250mm×57.15mm, and the size of the thin-walled part 1 is 464mm×133mm×45mm, and the minimum thickness of the thin-walled web is 1.27mm;

[0053] The processing steps of the second processing area 4 include:

[0054] S1. Determine the arrangement of multiple thin-walled parts 1 on the blank 2, so as to determine the position of the process boss 7. In this embodiment, the number of the thin-walled parts 1 is 2, and the two thin-walled parts are rotated 180 degrees relative to each other, with a spacing of 5 mm, and are arranged and processed by being displaced 2 mm from top to bottom;

[0055] S2. Select the tool size and feed amount. In this embodiment, the tool diameter is D=16 mm, the bottom R=0.5, the radial feed amount AP=16 mm, and the lateral feed amount AE=2 mm;

[0056] S3, perform a rough milling with the selected feed amount, so that the bottom finishing allowance is 0.5mm;

[0057] S4, performing fine milling on the contour of the thin-walled part 1 formed after rough milling to a predetermined size;

[0058] S5, repeat steps S3 and S4, and keep the last cut;

[0059] The first processing area 3 processing steps include:

[0060] (1) Select the tool size and feed amount. In this embodiment, the tool diameter is D = 16 mm, the bottom R = 3, the roughing radial feed amount AP = 15 mm, and the lateral AE = 2 mm;

[0061] (2) Perform a rough milling with the selected feed amount so that the bottom finishing allowance is 0.5 mm;

[0062] (3) fine milling the contour of the thin-walled part 1 formed after rough milling to a predetermined size;

[0063] (4) Repeat steps (2) and (3), and the last cut is only rough milling to form the other side of the process boss 7.

[0064] When the first processing area 4 and the second processing area 3 are processed, processing step S6 is performed, and the processing step S6 includes:

[0065] S6, the last cut in the second processing area 4 is processed. The processing amount of the last cut is the same as that of S2. At the same time, it is lifted by 0.1 mm along the tool axis direction, so that an additional processing area is formed at the processing end point. The additional processing area is a side surface of the process boss 7, and at the same time, a contour surface processing of the thin-walled part 1 is completed.

[0066] The present invention improves the tool path, thereby avoiding the defect of the traditional method of prioritizing large-area rough processing and then performing overall fine milling, which leads to a decrease in rigidity and tool chattering. The overall rigidity is better during fine milling, so that the thin-walled part 1 can be processed thinner. At the same time, an additional processing area is formed for the second processing area 4 and serves as one side of the process boss 7, so that the size of the process boss 7 can be processed small enough while ensuring the rigidity, thereby greatly reducing the loss of blanks and improving the ability to process multiple pieces at a time. At the same time, the process boss 7 of a sufficiently small size can facilitate the separation of the thin-walled part 1 after processing, thereby facilitating the processing of the next thin-walled part 1.

[0067] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A multi-axis aviation thin-walled part one-time multi-piece numerical milling method, wherein the thin-walled part comprises a web and integrally formed vertical ribs, and the blank is clamped and fixed on the machine tool operating surface by a center vise, characterized in that: A first processing area and a second processing area are formed on both sides of the blank, the first processing area and the second processing area are arranged up and down, and a process boss is formed between the first processing area and the second processing area; The second processing area processing step comprises: S1. Determine the arrangement of multiple thin-walled parts on the blank, so as to determine the position of the process boss; S2, select tool size and feed amount; S3, performing a rough milling with the selected feed amount; S4, performing fine milling on the thin-walled part contour formed after rough milling to a predetermined size; S5, repeat steps S3 and S4, and keep the last cut; S6. Process the last cut and lift along the tool axis to form an additional processing area at the end of the processing. The additional processing area is a side surface of the process boss, and at the same time, a contour surface processing of the thin-walled part is completed.

2. A multi-axis aerospace thin-walled parts one-time multi-piece milling method according to claim 1, characterized in that: The first processing area processing step comprises: (1) Select tool size and feed amount; (2) Perform a rough milling operation with the selected feed amount; (3) fine milling the contour of the thin-walled part (1) formed after rough milling to a predetermined size; (4) Repeat steps (2) and (3), and the last cut is only rough milling to form the other side of the process boss.

3. The multi-axis aerospace thin-walled parts one-time multi-piece milling method according to claim 2, characterized in that: The processing order of the first processing area and the second processing area can be interchanged, and S6 is the last cut of the thin-walled part processing step.

4. The method for multi-axis aerospace thin-walled parts milling at one time according to claim 2, characterized in that: The thickness of the process boss is 0.1mm-0.25mm.

5. A multi-axis aerospace thin-walled parts one-time multi-piece milling method according to any one of claims 1 to 4, characterized in that: The tool diameter in S2 is D=16mm, the radial feed AP=40mm, and the lateral feed AE=1.5mm.

6. A multi-axis aerospace thin-walled parts one-time multi-piece numerical milling method according to any one of claims 1 to 4, characterized in that: The lift value in S5 is 0.1mm.

7. A multi-axis aerospace thin-walled parts one-time multi-piece numerical milling method according to any one of claims 1 to 4, characterized in that: After S3 medium rough milling, a 0.5mm finishing allowance is retained.

8. A multi-axis aerospace thin-walled parts one-time multi-piece milling method according to any one of claims 1 to 4, characterized in that: Adjacent thin-walled parts are rotated 180 degrees relative to each other and there is a gap between them.

9. A multi-axis aerospace thin-walled parts one-time multi-piece milling method according to claim 8, characterized in that: Adjacent thin-walled parts are arranged in an up-down staggered manner.

10. A multi-axis aerospace thin-walled parts one-time multi-piece numerical milling method according to any one of claims 1 to 4, characterized in that: The minimum thickness of the thin-walled part is 1.27 mm.

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