Empennage milling method

Abstract

The invention discloses an empennage milling method which comprises the following steps: S1, carrying out three-dimensional modeling and machining programming on an empennage by adopting NX software, completing cutter milling feeding path programming in the NX software, and then generating a numerical control milling machine program code; s2, according to three-dimensional modeling of the empennage through NX software, a milling face machined on the empennage is divided into a plurality of machining area faces, and the machining area faces are faces with closed solid lines; and S3, the inclined plane or the straight plane in the machining area face is milled through a first cutter side edge installed on the numerical control milling machine, and the curved face in the machining area face is milled through a second cutter installed on the numerical control milling machine. According to the method, after three-dimensional modeling is conducted through NX software, the feeding path is generated and controlled in the machining module, so that the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to a tail wing milling processing method for performing three-dimensional modeling of the tail wing by utilizing NX software. Background Art

[0002] The tail fin is a structurally shaped part that requires high processing precision. There are two main processing methods for the tail fins currently used in rockets.

[0003] First, the use of aluminum plate integral machining has the following disadvantages: 1) Very easy to deform. Due to the large allowance, the residual stress after processing is large, so the processed tail wing is very easy to deform.

[0004] 2) Due to the large machining allowance, tool wear increases during the machining process, which increases the machining cost.

[0005] 3) Low material utilization rate.

[0006] 4) The processing cycle is long and the efficiency is low.

[0007] Second, the aluminum alloy warm extrusion process is used to extrude the aluminum plate into a billet with a size similar to that of the tail structure, and then machine it. This method has the following disadvantages: 1) This processing method can only extrude one blank at a time, and the processing efficiency of the blank is relatively low.

[0008] 2) This method uses a forward extrusion method, which requires a relatively high extrusion force and consumes a lot of energy.

[0009] In view of the above shortcomings, it is necessary to find a new blank manufacturing method that can improve material utilization, improve processing efficiency and reduce manufacturing costs to process the tail wing. Summary of the invention

[0010] The invention provides a tail wing milling processing method. The invention uses NX software to three-dimensionally model and then generates and controls a tool path in a processing module to improve production efficiency.

[0011] The technical solutions to the above problems are as follows: The tail wing milling processing method comprises the following steps: S1, use NX software to perform 3D modeling and machining programming on the tail wing, complete tool path programming for milling in NX software, and then generate CNC milling machine program code; S2, based on the three-dimensional modeling of the tail wing by NX software, the machined milling surface on the tail wing is divided into a plurality of processing area surfaces, and these processing area surfaces are surfaces with closed solid lines; S3, using the side edge of a first tool installed on the CNC milling machine to mill an inclined plane or a straight plane in the processing area, and using a second tool installed on the CNC milling machine to mill a curved surface in the processing area.

[0012] Further, the center line of the first tool is parallel to the surface of the milling processing area.

[0013] Further, the shape of the cutting edge of the first tool matches the vertical cross-section of the surface of the tail wing that needs to be milled.

[0014] Furthermore, the second tool has four spiral blades, including a first arc blade, a second arc blade, and a third arc blade, the outer diameter of the first arc blade is smaller than the outer diameter of the second arc blade, and the outer diameter of the second arc blade is smaller than the outer diameter of the third arc blade.

[0015] According to the shape characteristics of the tail wing, the present invention subdivides the milling surface into six processing area surfaces, uses NX software to program the milling control of the tail wing part, and can accurately control the milling tool path and the tool axis direction according to the three-dimensional model, and can simulate the tool processing and milling conditions. During the rough processing of the tail wing part, a conical milling cutter is used for efficient material removal, and the fine processing of the tail wing part adopts the side edge of a universal round nose milling cutter for efficient milling, and the cylindrical and rounded parts are milled with a second type of cutter.

[0016] The beneficial effects of the present invention are: The present invention utilizes NX software for flexible modeling and uses a multi-method and multi-strategy approach to control tool path milling programming, thereby improving product surface quality and greatly saving processing time, from the initial 25 minutes to 6 minutes, thereby significantly reducing product processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the picture after the tail wing is processed and formed.

[0018] Figure 2 This is the rough drawing of the tail wing before processing.

[0019] Figure 3 This is an indication of the tail wing processing area.

[0020] Figure 4 is a schematic diagram of the second tool. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the examples of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other implementation methods can be obtained according to the drawings in the specification without paying creative work, and these implementation methods are still within the protection scope of the claims of the present invention.

[0022] like Figures 1 to 4 As shown, the tail wing milling processing method of the present invention comprises the following steps: S1, use NX software to perform 3D modeling and machining programming on the tail wing, complete the tool path programming for milling machining in NX software, and then generate the CNC milling machine program code.

[0023] Figure 1 The tail shape shown is a circular evenly distributed form. When programming with NX software, it is only necessary to program and generate a tool path for a certain identical feature area of ​​the tail wing. The remaining identical areas use the NX software to generate tool paths in a circular array. After all tool paths are generated, use NX software post-processing to generate machining program codes for machining. This can greatly improve programming efficiency.

[0024] S2, based on the three-dimensional modeling of the tail wing by NX software, the machined milling surface on the tail wing is divided into a plurality of processing area surfaces, and these processing area surfaces are surfaces with closed solid lines.

[0025] Figure 3 In the figure, an area on the tail wing is divided into six processing area surfaces, which are indicated by numbers 1, 2, 3, 4, 5, and 6 respectively.

[0026] S3, using a CNC milling machine plus a CNC dividing head sub-axis, adopts a one-clamp-one-top method for milling. One clamp is to clamp the tail blank with the sub-axis, and one top is to hold the tail blank with the tail stock ejector. The coincidence error between the sub-axis rotation center and the tail stock ejector center is 0.01mm, and the circumferential runout and generatrix runout of the tail stock ejector should be within 0.01mm. The CNC dividing head sub-axis uses a servo stepper motor to control the rotation angle according to the CNC program instructions. The clamping scheme uses a high-precision three-jaw chuck, and its circumferential runout and generatrix runout are within 0.005mm.

[0027] The side edge of the first tool installed on the CNC milling machine is used to mill the inclined plane or straight plane in the processing area. The center line of the first tool is parallel to the milling processing area surface, and the cutting edge shape of the first tool matches the vertical cross section of the surface to be milled of the tail wing. In this embodiment, the first tool includes a conical milling cutter and a round nose milling cutter. The conical milling cutter tip is used to contact the tail wing with a point contact method. Figure 3The processing areas indicated as 1, 2, 4, 5, and 6 are milled and rough-processed using a conical milling cutter. The rough-processing cutting efficiency is high compared to when a conical milling cutter is not used, and the processing time of a tail wing part can be saved by 4 minutes.

[0028] The invention utilizes the side edge of the round nose milling cutter for efficient milling, fully utilizing the shape characteristics of the tail wing parts. Figure 3 The processing areas 4, 5, 6, 1, and 2 indicated in the figure are milled once, which can save 9 minutes of processing time for processing a tail wing and make the surface roughness of the part smoother.

[0029] Figure 3 The processing area surface indicated by the middle mark 3 is milled by multiple tool paths before the present invention, which has low cutting efficiency. The present invention uses a second tool installed on the CNC milling machine to perform one-cut milling on the processing area surface 3. Compared with multi-tool path milling, the processing time of a tail wing can be saved by 6 minutes.

[0030] The second tool has four spiral blades, which include a first arc blade 11, a second arc blade 12, and a third arc blade 13. The outer diameter of the first arc blade 11 is smaller than the outer diameter of the second arc blade 12, and the outer diameter of the second arc blade 12 is smaller than the outer diameter of the third arc blade 13.

[0031] The second tool mills the surface of the tail wing Figure 3 The special-shaped tool with the number 3 in the middle processing area is designed to prevent the tool from hitting the tail wing part during the milling process within the limited space of the processing equipment and the tail wing part clamping space, and it can save raw materials and reduce the processing cost of the tail wing part. Figure 4 In the middle, L is the height range of the second tool cutting edge, and D is the tool handle. A four-spiral cutting edge is adopted, which is conducive to chip removal, reduces tool chattering, and improves the surface processing quality of the tail wing parts.

Claims

1. Tail wing milling method, characterized in that: The following steps are involved: S1, use NX software to perform 3D modeling and machining programming on the tail wing, complete tool path programming for milling in NX software, and then generate CNC milling machine program code; S2, based on the three-dimensional modeling of the tail wing by NX software, the machined milling surface on the tail wing is divided into a plurality of processing area surfaces, and these processing area surfaces are surfaces with closed solid lines; S3, using the side edge of a first tool installed on the CNC milling machine to mill an inclined plane or a straight plane in the processing area, and using a second tool installed on the CNC milling machine to mill a curved surface in the processing area.

2. The tail wing milling method according to claim 1, characterized in that: The center line of the first tool is parallel to the milling processing area surface.

3. The tail wing milling method according to claim 1, characterized in that: The cutting edge shape of the first tool matches the vertical cross-section of the surface to be milled of the tail wing.

4. The tail wing milling method according to claim 1, characterized in that: The second tool has four spiral blades, the blades comprising a first circular blade (11), a second circular blade (12), and a third circular blade (13); the outer diameter of the first circular blade (11) is smaller than the outer diameter of the second circular blade (12), and the outer diameter of the second circular blade (12) is smaller than the outer diameter of the third circular blade (13).

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