A follow-up positioning flexible support unit structure for machining process boss

Abstract

The present invention provides a follow-up positioning flexible support unit structure for a machining process boss, comprising: a positioning bolt (1), a support column (2), a positioning nut (3), a guide seat (4), a base (5), a mounting bolt (6), a cylindrical pin (7), a threaded sleeve (8), and a spring (9); a part machining process boss (10) is arranged on the upper surface of the support column (2); the positioning bolt (1) is inserted into the part machining process boss (10), the support column (2), the guide seat (4), and the base (5); the bottom of the positioning bolt (1) is threadedly connected to the base (5) through the threaded sleeve (8); and the spring (9) is sleeved on the positioning bolt (1). Accurate and efficient follow-up positioning of the process boss based on deformation during the part machining process is achieved, thereby improving part machining accuracy and shortening the machining cycle.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft manufacturing, and in particular to a follow-up positioning flexible support unit structure for a machining process boss. Background Art

[0002] In aircraft manufacturing, large, complex, and deep-cavity parts require high machining precision and are challenging to control deformation. This often requires multiple CNC milling and turning operations during machining and during resting. Stress is continuously released during machining and resting, and multiple datum adjustments are required before finishing to eliminate part deformation. After fine-tuning and positioning the process datum features, the spatial position of the process boss positioning support surface changes, and this change cannot be quantified. During the repeated flipping, clamping, and positioning of the part, the spatial position of the process boss positioning datum surface cannot be quickly and accurately determined, directly impacting part machining accuracy and efficiency, making it impossible to meet the high-precision manufacturing requirements of modern aircraft.

[0003] The traditional large-scale complex curvature parts processing process adopts the bolt pressure plate clamping method for boss positioning. During the processing, the spatial position of the pressure plate needs to be frequently adjusted, resulting in low clamping efficiency, long processing cycle and high manufacturing cost.

[0004] It is difficult to determine the position of the process boss reference surface during repeated clamping and positioning during the processing of large-sized parts with complex curvature. The traditional positioning bolt and pressure plate positioning and clamping efficiency is low, the processing cycle is long, and the manufacturing cost is high. Summary of the Invention

[0005] The present invention provides a follow-up positioning flexible support unit structure for a machining process boss, which realizes accurate and efficient follow-up positioning of the process boss based on deformation during part machining, improves part machining accuracy, and shortens the machining cycle.

[0006] The present invention provides a follow-up positioning flexible support unit structure for a machining process boss, comprising: a positioning bolt 1, a support column 2, a positioning nut 3, a guide seat 4, a base 5, a mounting bolt 6, a cylindrical pin 7, a threaded sleeve 8, and a spring 9;

[0007] The base 5 is fixed by mounting bolts 6. A first annular groove is provided in the center of the upper portion of the base 5. The guide seat 4 is located on the upper end surface of the base 5. An oblong hole is provided on the side of the guide seat 4.

[0008] The upper part of the support column 2 is a cylindrical structure with a through hole in the center of the end face, and the lower part is a cylindrical structure with an external fine-pitch thread containing a second annular groove. The lower part of the support column 2 is sleeved in the guide seat 4, and a cylindrical pin hole is provided on the side of the lower part of the support column 2. The cylindrical pin 7 passes through the oblong hole and is inserted into the cylindrical pin hole; the fine-pitch thread on the outer side of the support column 2 is connected to the positioning nut 3. When the position of the support column 2 is adjusted, the positioning nut 3 is attached to the upper part of the support column 2, and the cylindrical pin 7 moves up and down in the guide hole;

[0009] The part processing technology boss 10 is set on the upper surface of the support column 2, and the positioning bolt 1 is passed through the part processing technology boss 10, the support column 2, the guide seat 4 and the base 5; the bottom of the positioning bolt 1 is threadedly connected to the base 5 through a threaded sleeve 8;

[0010] A spring 9 is sleeved on the positioning bolt 1 , the upper end of the spring 9 is in contact with the second annular groove, and the lower end of the spring 9 is in contact with the first annular groove.

[0011] Optionally, the positioning bolt 1 is a standard hexagonal socket bolt.

[0012] Optionally, the guide seat 4 has a lug on the upper portion, and a center hole is provided on the lug;

[0013] A positioning bolt 1 is passed through the center hole.

[0014] Optionally, the bottom of the guide seat 4 is connected to the base 5 via flange bolts.

[0015] Optionally, the threaded sleeve 8 is a double-thread structure with fine threads inside and coarse threads outside, and both the inside and the outside are threadedly connected.

[0016] Optionally, during the positioning process, the lower end surface of the positioning nut 3 fits into the upper end surface of the guide seat 4 .

[0017] Optionally, the base 5 is fixedly connected to the machining fixture 12 by means of mounting bolts 6;

[0018] A plurality of follow-up positioning flexible support unit structures are connected to the machining fixture 12.

[0019] Optionally, the support column 2 and the guide seat 4 are matched with each other through a small clearance between the hole and the axis.

[0020] The present invention provides a follow-up positioning flexible support unit structure for a machining process boss, which has at least the following beneficial effects:

[0021] 1) Based on the deformation and repeated flipping and clamping positioning process of the part processing process, it can effectively solve the problem that the part processing process boss cannot quickly and accurately determine the spatial position. A height-adjustable support column structure is designed. As the spatial position of the part process boss reference surface changes, the support height position is adjusted to achieve follow-up positioning support for the part processing process boss;

[0022] 2) Compared with the traditional bolt pressure plate clamping and positioning method for large-sized complex parts, the boss support surface of the part processing process can be quickly and accurately positioned by rotating the positioning nut, eliminating the tedious operations of repeated adjustment of the pressure plate space position and repeated installation of bolts in the traditional positioning process, which improves the part positioning efficiency and effectively shortens the part processing cycle;

[0023] 3) The operation complexity is low, the structure of the present invention is simple, and it is easy to install and operate on site;

[0024] 4) It has strong scalability and adaptability. The structure of the present invention can be based on the structural size of the part, and the number of follow-up positioning support units can be arranged as needed. The size of the flexible support structure can be changed to form a positioning support suitable for bosses of different sizes of parts processing technology, thereby improving the adaptability and reliability of part positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of the follow-up positioning flexible support unit structure;

[0026] Figure 2 This is a schematic cross-sectional view of the structure of the follow-up positioning flexible support unit;

[0027] Figure 3 This is a front view of the follow-up positioning flexible support unit structure (including the process boss);

[0028] Figure 4 It is a top view of the follow-up positioning flexible support unit structure (including the process boss);

[0029] Figure 5 This is a schematic diagram of the modular application of the follow-up positioning flexible support unit in the machining fixture;

[0030] Description of reference numerals:

[0031] Positioning bolt 1, support column 2, positioning nut 3, guide seat 4, base 5, mounting bolt 6, cylindrical pin 7, threaded sleeve 8, spring 9, processing boss 10, follow-up positioning flexible support unit 11, machining fixture tooling 12. DETAILED DESCRIPTION

[0032] The present application is further described in detail below with reference to examples and drawings:

[0033] The purpose of the present invention is to provide a flexible positioning support structure for process bosses during the processing of large-sized parts with complex curvatures, so as to solve the problems of difficulty in determining the position of the process boss reference plane during repeated positioning of part processing and low clamping and positioning efficiency, and to achieve accurate and efficient follow-up positioning of process bosses in complex part processing.

[0034] The technical solution adopted by the present invention is a positioning support structure for a process boss during the processing of large-sized complex curvature parts. The follow-up positioning flexible support structure includes positioning bolts, support columns, positioning nuts, guide seats, positioning cylindrical pins, springs, threaded sleeves, bases, and mounting bolts.

[0035] The positioning bolt is a standard hexagonal bolt with a threaded connection at the bottom. The upper part of the support column is a cylindrical structure with a through hole in the center of the end face, and the lower part is a cylindrical structure with an external fine thread and an annular groove. The side has a cylindrical pin hole, and the support column passes through the outside of the positioning bolt.

[0036] The positioning nut contains fine threads and is connected to the external threads of the support column;

[0037] The guide seat has a lug on the top and a through hole in the center, which fits with the lower part of the support column with a small gap. The side has an oblong hole corresponding to the cylindrical pin hole of the support column, and the bottom is connected by a flange bolt.

[0038] The positioning cylindrical pin passes through the oblong hole of the guide seat and is matched with the cylindrical pin hole of the support column with a small gap; the spring passes through the outside of the positioning bolt and is located in the central through hole of the guide seat;

[0039] The threaded sleeve has a double thread structure with fine threads inside and coarse threads outside, and both the inside and the outside are threaded;

[0040] There are 3 flange-jointing bolt holes evenly distributed on the upper end surface of the base, the center of which is a through hole. The upper end hole contains an annular groove. The through hole part has coarse thread and the bottom is connected by flange bolts; the mounting bolts are standard flange-jointing bolts.

[0041] The positioning bolt passes through the support column, the spring and the base, the lower end surface of the bolt head fits with the positioning surface on the product, and the lower part of the bolt is connected to the threaded sleeve.

[0042] The outer portion of the support column is connected to the positioning nut through a thread, and is matched with a small gap in the central through hole of the guide seat, and the upper surface of the support column is fitted with the lower positioning surface of the product.

[0043] During the positioning process of the positioning nut, the lower end surface of the nut is in contact with the upper end surface of the guide seat.

[0044] The bottom of the guide seat is connected to the upper surface of the base through a flange.

[0045] One end of the positioning cylindrical pin passes through the pin hole on the side of the support column, and the other end is located in the oblong hole of the guide seat, and can move up and down along the oblong hole.

[0046] The upper end of the spring fits in the annular groove in the lower hole of the support column, and the lower end fits in the inner annular groove in the upper hole of the base.

[0047] The outside of the threaded protective sleeve is connected to the base through threads, and the inside of the threaded protective sleeve is connected to the positioning bolt through threads.

[0048] The upper end surface of the base is connected to the lower end surface of the guide seat bottom through flange bolts, and the lower end surface of the base is fixed by 4 bolts.

[0049] The mounting bolts are used for connecting the guide seat flange and fixing the base.

[0050] In a specific embodiment of the present invention, a follow-up positioning flexible support unit structure is provided, such as Figures 1 to 5 As shown, it includes a positioning bolt 1, a support column 2, a positioning nut 3, a guide seat 4, a base 5, a mounting bolt 6, a cylindrical pin 7, a threaded sleeve 8, and a spring 9.

[0051] Figure 1 The support column 2 is threadedly engaged with the positioning nut 3, the guide seat 4 is located on the upper end surface of the base 5 and is installed by bolt connection, and the base 5 is fixed by mounting bolts 6;

[0052] Figure 2 The positioning bolt 1 shown passes through the support column 2, the guide seat 4, and the spring 9, and is connected to the threaded sleeve 8 by a thread. The support column 2 and the guide seat 4 are matched with a small gap between the hole and the axis. The cylindrical pin 7 is inserted into the guide seat 4 and is matched with the support column 2 through a small gap between the hole and the axis. The threaded sleeve 8 is connected to the base 5 by a thread.

[0053] Figure 3 、 4 The part processing technology shown is that the boss 10 is fitted to the upper surface of the support column 2 via two positioning bolts 1;

[0054] Figure 5 As shown, the follow-up positioning flexible support unit 11 is modularly applied in the machining fixture 12.

[0055] The working process of the follow-up positioning flexible support unit structure of the present invention is as follows:

[0056] Step 1: During the part machining flip positioning process, after the part machining process reference feature is positioned, the process boss is in an unconstrained free state. At this time, the positioning bolt 1 is rotated to remove the positioning bolt, and the support column 2 is slid to fit the upper surface of the support column 2 with the lower surface of the machining process boss 10, so as to quickly and accurately determine the position of the process boss support surface;

[0057] Step 2: Rotate the positioning nut 3 downward until the positioning nut 3 is tightly fitted with the upper surface of the guide seat 4, thereby constraining the control process boss to move axially downward along the follow-up positioning flexible support unit 11;

[0058] Step three, install the positioning bolts 1 in sequence, tighten the positioning bolts 1 so that the process boss fits tightly with the sliding support column 2, and the process boss is reliably fixed to the guide seat 4, so as to realize the constraint control of the process boss's axial upward and circumferential movement freedom along the follow-up positioning flexible support unit 11, and quickly and accurately realize the positioning and support of the part processing process boss.

Claims

1. A follow-up positioning flexible support unit structure for a machining process boss, characterized in that: include: Positioning bolt (1), support column (2), positioning nut (3), guide seat (4), base (5), mounting bolt (6), cylindrical pin (7), threaded sleeve (8), spring (9); The base (5) is fixed by mounting bolts (6), a first annular groove is provided in the center of the upper portion of the base (5), the guide seat (4) is located on the upper end surface of the base (5), and an oblong hole is provided on the side surface of the guide seat (4); The upper portion of the support column (2) is a columnar structure with a through hole in the center of the end face, and the lower portion is a columnar structure with an external fine-threaded structure containing a second annular groove. The lower portion of the support column (2) is sleeved in the guide seat (4), and a cylindrical pin hole is provided on the side surface of the lower portion of the support column (2). The cylindrical pin (7) passes through the oblong hole and is inserted into the cylindrical pin hole. The outer fine-threaded structure of the support column (2) is connected to the positioning nut (3). When the position of the support column (2) is adjusted, the positioning nut (3) is attached to the upper portion of the support column (2), and the cylindrical pin (7) moves up and down in the guide hole. The part processing technology boss (10) is arranged on the upper surface of the support column (2), and the positioning bolt (1) is passed through the part processing technology boss (10), the support column (2), the guide seat (4) and the base (5); the bottom of the positioning bolt (1) is threadedly connected to the base (5) through a threaded sleeve (8); A spring (9) is sleeved on the positioning bolt (1), the upper end of the spring (9) is fitted with the second annular groove, and the lower end is fitted with the first annular groove.

2. The follow-up positioning flexible support unit structure for machining boss according to claim 1, characterized in that: The positioning bolt (1) is a standard hexagonal slot bolt.

3. The follow-up positioning flexible support unit structure for machining boss according to claim 1, characterized in that: The guide seat (4) has a lug on its upper portion, and a center hole is provided on the lug; A positioning bolt (1) is passed through the center hole.

4. The follow-up positioning flexible support unit structure for machining boss according to claim 1, characterized in that: The bottom of the guide seat (4) is connected to the base (5) via flange bolts.

5. The follow-up positioning flexible support unit structure for machining boss according to claim 1, characterized in that: The threaded sleeve (8) is a double-thread structure with fine threads inside and coarse threads outside, and both the inside and the outside are threadedly connected.

6. The follow-up positioning flexible support unit structure for machining boss according to claim 1, characterized in that: During the positioning process, the lower end surface of the positioning nut (3) fits into the upper end surface of the guide seat (4).

7. The follow-up positioning flexible support unit structure for machining boss according to claim 1, characterized in that: The base (5) is fixedly connected to the machining fixture (12) via mounting bolts (6); A plurality of follow-up positioning flexible support unit structures are connected to the machining fixture tooling (12).

8. The follow-up positioning flexible support unit structure for machining boss according to claim 1, characterized in that: The support column (2) and the guide seat (4) are matched with each other through a small clearance between the hole and the shaft.

Images