Machining method and machining system for improving machining quality of bushing

Abstract

The invention relates to a machining method and system for improving the machining quality of a bush. The machining method comprises the following steps that the outer contour, an inner hole, an anti-rotation groove and a positioning groove of the bush are machined in the turning procedure; in the edge cutting procedure, a stamping die is provided with a positioning pin corresponding to the positioning groove in position, and the positioning pin is parallel to the center axis of the lining. The positioning pin is embedded into the positioning groove, and a convex lug is machined; and a second preset included angle is formed between the lug and the anti-rotation groove relative to the central axis position of the bushing. According to the embodiment of the invention, the position requirements of the inner anti-rotation groove and the outer lug of the bushing are ensured, the product quality consistency is improved, and the processing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly relates to a machining method and a machining system for improving the machining quality of a bushing. Background Art

[0002] The high-strength quick-release lock assembly is an important connecting part on the aircraft hatch cover, and the reliability of its machining quality determines the reliability of the connection. The bushing is an important structural part in the high-strength quick-release lock assembly for supporting and preventing the washer from rotating. The machining of the anti-rotation groove therein is a difficult point in the machining of the bushing.

[0003] In the prior art, it is difficult to control the quality of the depth dimension of the anti-rotation groove and the position requirement between the groove and the external lug. The internal anti-rotation groove and the external lug of the bushing are machined in different processes. This machining method has many disadvantages. On the one hand, due to the operations and positioning in different processes, position errors are likely to occur, resulting in the product not meeting the process requirements and affecting the product quality. On the other hand, during the machining of the anti-rotation groove, the groove-pushing machining will cause the outer diameter of the product to deform and the depth dimension of the groove cannot meet the requirements. At the same time, the groove-pushing machining will generate large burrs at the root of the groove, and it is difficult for the fitter to file and repair, with low production efficiency. Furthermore, it affects the overall dimensional accuracy and assembly performance of the bushing, reducing the qualified rate and production efficiency of the product. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention discloses a machining system and a machining method for improving the machining quality of a bushing.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A machining method for improving the machining quality of a bushing, comprising the following steps:

[0007] In the turning process, machine the outer contour, inner hole, anti-rotation groove and positioning groove of the bushing; the anti-rotation groove is located on the inner hole wall of the bushing and is parallel to the central axis of the bushing; the positioning groove is located on the outer wall of the bushing and is parallel to the central axis of the bushing; relative to the position of the central axis of the bushing, there is a first preset angle between the anti-rotation groove and the positioning groove;

[0008] In the trimming process, the stamping die is provided with a positioning pin whose position corresponds to the positioning groove, and the positioning pin is parallel to the central axis of the bushing; fit the positioning pin with the positioning groove and machine the lug; relative to the position of the central axis of the bushing, there is a second preset angle between the lug and the anti-rotation groove.

[0009] A further technical solution thereof is that the anti-rotation groove is machined in the turning process by a grooving tool; the grooving tool is provided with one cutting edge, and the height of the tool of the grooving tool is less than the diameter of the inner hole.

[0010] A further technical solution is that the height of the tool of the grooving tool is less than the radius of the inner hole.

[0011] A further technical solution is that the grooving tool cuts the anti-rotation groove by a micro pecking machining method.

[0012] A further technical solution is that when the grooving tool processes the anti-rotation groove, the grooving tool feeds 10 - 15 wires each time, then retracts the tool, discharges the metal chips, and then makes the next feed.

[0013] A further technical solution is that there are two groups of the anti-rotation grooves and the positioning grooves. The positions of the two anti-rotation grooves are axisymmetric with respect to the center axis of the bushing, and the positions of the two positioning grooves are axisymmetric with respect to the center axis of the bushing; when processing the anti-rotation groove, first process one anti-rotation groove, then clamp the part, rotate 180° around the center of the bushing, and then process the other anti-rotation groove.

[0014] A further technical solution is that both the first preset angle and the second preset angle are 45°.

[0015] A processing system for improving the processing quality of a bushing is used to implement the processing method for improving the processing quality of a bushing as described in any one of the above; the processing system includes a turning system; the turning system includes a fixture for clamping the bushing material and a grooving tool; the grooving tool is provided with one cutting edge, and the height of the tool of the grooving tool is less than the diameter of the inner hole.

[0016] A further technical solution is that the processing system further includes a stamping system; the stamping system includes a stamping die, and a positioning pin is arranged inside the stamping die; the positioning pin is parallel to the central axis of the bushing; the position of the positioning pin corresponds to that of the positioning groove.

[0017] A further technical solution is that the cross-section of the positioning groove is a semi-circular arc, and the shape of the positioning pin matches that of the positioning groove.

[0018] The beneficial effects of the present invention are as follows:

[0019] The embodiment of the present invention provides an effective solution for processing a bushing, ensuring the position requirements of the anti-rotation groove inside the bushing and the external lug, and improving the product quality consistency.

[0020] The embodiment of the present invention effectively prevents the outer circle deformation caused by grooving and ensures the depth dimension of the groove, improving the processing quality and qualification rate of the product.

[0021] The embodiment of the present invention optimizes the processing process, reduces the number of processes and clamping times during the processing, and improves the product quality consistency and production efficiency. Brief Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the turning process in the embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the trimming process in the embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the completion of the trimming process in the embodiment of the present invention.

[0025] Figure 4 It is a schematic diagram of improving the turning process in the embodiment of the present invention.

[0026] Figure 5 It is a schematic diagram of the anti-rotation groove machining in the prior art.

[0027] In the figure: 1, positioning groove; 2, external contour; 3, inner hole; 4, anti-rotation groove; 5, lug; 6, positioning pin; 7, outer wall of the bushing; 8, grooving tool; 9, cutting edge. Detailed Embodiment

[0028] Generally, the processing of the bushing will go through the following steps:

[0029] Step S1', turning the outer shape and inner hole of the bushing; Step S2', trimming; Step S3', turning the conical surface; Step S4', deburring; Step S5', grooving; Step S6', general inspection; Step S7', packaging and warehousing. In the grooving step, there are the following problems: 1) There is a 45° positional requirement between the anti-rotation groove and the lug, and the positioning and clamping of the bushing are relatively difficult, which easily leads to unqualified positions between the anti-rotation groove and the lug in the processed product; 2) As Figure 5 shown, when using the grooving tool for processing, the two anti-rotation grooves are processed at one time, which will generate a large axial thrust, and the outer circle of the thin-walled bushing is subjected to a large extrusion, and the outer circle is prone to deformation; 3) Large flash burrs will be generated at the root of the bushing, which will affect the depth dimension of the anti-rotation groove and cannot meet the requirements; 4) It is difficult for the fitter to file the flash burrs, which reduces the processing quality and production efficiency.

[0030] Based on the above production status, the following will describe the specific embodiments of the present invention with reference to the accompanying drawings.

[0031] Embodiment 1

[0032] Embodiment 1 discloses a processing method for improving the processing quality of the bushing, including the following steps:

[0033] Step S1, re-design the processing drawing of the turning process, Figure 1 It is a schematic diagram of the turning process in the embodiment of the present invention. As Figure 1As shown, a positioning groove 1 is added to the machining drawing of the turning process.

[0034] Step S2: Turning process. In the turning process, the outer contour 2, inner hole 3, anti-rotation groove 4, and positioning groove 1 of the bushing are machined. During machining, the anti-rotation groove 4 is located on the inner hole wall of the bushing and is parallel to the central axis of the bushing. The positioning groove 1 is located on the outer contour 2 of the bushing and is parallel to the central axis of the bushing. Relative to the position of the central axis of the bushing, there is a first preset angle between the anti-rotation groove 4 and the positioning groove 1. In this embodiment, the first preset angle is specifically 45°.

[0035] Preferably, the guarantee of the angle and position requirements of the first preset angle between the anti-rotation groove 4 and the positioning groove 1 is achieved through different tool positions and numerical control programs.

[0036] Step S3: Trimming process. The trimming process is completed on a stamping device. Figure 2 It is a schematic diagram of the trimming process in the embodiment of the present invention. Figure 3 It is a schematic diagram of the completion of the trimming process in the embodiment of the present invention. As Figure 2 、 Figure 3 shown, in the trimming process, the stamping die is provided with a positioning pin 6 corresponding to the positioning groove 1, and the positioning pin 6 is parallel to the central axis of the bushing. The positioning pin 6 is engaged with the positioning groove 1, and the lug 5 is machined along the outer wall 7 of the bushing. Relative to the position of the central axis of the bushing, there is a second preset angle between the lug 5 and the anti-rotation groove 4. In this embodiment, the second preset angle is 45°. Due to the setting of the positioning groove 1 and the positioning pin 6 engaged with the positioning groove 1, it can be ensured that the machining position of the lug 5 and the anti-rotation groove 4 have a 45° angle relative to the central axis of the bushing.

[0037] Furthermore, in this embodiment, there are two groups of anti-rotation grooves 4 and positioning grooves 1. The positions of the two anti-rotation grooves 4 are symmetrical with respect to the central axis of the bushing, and the positions of the two positioning grooves 1 are symmetrical with respect to the central axis of the bushing. When machining the anti-rotation groove 4, first machine one anti-rotation groove 4, then clamp the part, rotate it 180° around the central axis of the bushing, and then machine the other anti-rotation groove 4.

[0038] Step S4: Final inspection.

[0039] Step S5: Packaging and warehousing.

[0040] This embodiment ensures the relative position requirements between the anti-rotation groove 4 located inside the bushing and the lug 5 located outside the bushing, improving the consistency of product quality.

[0041] Moreover, this embodiment optimizes the machining process, reduces the number of processes and clamping times for machining, and improves the production efficiency of the product.

[0042] Embodiment 2

[0043] On the basis of Embodiment 1, Embodiment 2 further improves the turning process in step S2. Figure 4 It is a schematic diagram of improving the turning process in the embodiments of the present invention. As Figure 4 shown, specifically, the anti-rotation groove 4 is machined by the grooving tool 8 in the turning process. The grooving tool 8 is provided with a cutting edge 9, and the height of the tool of the grooving tool 8 is less than the diameter of the inner hole 3.

[0044] Furthermore, in order to facilitate the rotation of the grooving tool 8 in the inner hole 3, the height of the tool of the grooving tool 8 is less than the radius of the inner hole 3.

[0045] Furthermore, the grooving tool 8 cuts the anti-rotation groove by a micro pecking machining method.

[0046] Furthermore, when the grooving tool 8 processes the anti-rotation groove 4, the grooving tool 8 feeds 10 - 15 wires each time, preferably 12 wires, and then retracts the tool. After discharging the metal chips, the next feed is carried out. By machining in multiple feeds like this, after machining one anti-rotation groove 4, the chuck clamping the part is controlled to rotate 180°, and the machining of the other anti-rotation groove 4 is completed. This machining method ensures that no large cutting force is generated on the part during the machining of the anti-rotation groove 4, thus effectively preventing the deformation of the outer circle of the thin-wall bushing.

[0047] Furthermore, after step S2 is completed, a burr removal process is added. For the burrs generated at the root of the inner hole 3 due to the machining of the anti-rotation groove 4, they are removed by precision turning the inner hole 3, reducing the filing workload of the fitter for the burrs at this part. At the same time, the depth dimension of the anti-rotation groove 4 can also meet the requirements, reducing the error caused by the burrs.

[0048] This embodiment effectively prevents the outer circle deformation caused by the grooving, ensures the depth dimension of the groove, and improves the machining quality and qualification rate of the product.

[0049] Embodiment 3

[0050] Embodiment 3 discloses a machining system for improving the machining quality of the bushing, which is used to implement the machining method for improving the machining quality of the bushing in Embodiment 1 or Embodiment 2.

[0051] The machining system of Embodiment 3 includes a turning system. The turning system includes a fixture for clamping the bushing material and a grooving tool 8. The grooving tool 8 is provided with a cutting edge 9, and the height of the tool of the grooving tool 8 is less than the diameter of the inner hole 3.

[0052] The processing system further includes a stamping system. The stamping system includes a stamping die, and a positioning pin 6 is arranged inside the stamping die. The positioning pin 6 is parallel to the central axis of the bushing. The position of the positioning pin 6 corresponds to that of the positioning groove 1. Preferably, the cross-section of the positioning groove 1 is a semi-circular arc, and the shape of the positioning pin 6 matches that of the positioning groove 1.

[0053] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention is referred to the claims. Without departing from the basic structure of the present invention, the present invention can be modified in any form.

Claims

1. A processing method for improving the processing quality of a bushing, characterized in that, Including the following steps: In the turning process, machine the outer contour, inner hole, anti-rotation groove and positioning groove of the bushing; the anti-rotation groove is located on the inner hole wall of the bushing and is parallel to the central axis of the bushing; the positioning groove is located on the outer wall of the bushing and is parallel to the central axis of the bushing; with respect to the position of the central axis of the bushing, there is a first preset angle between the anti-rotation groove and the positioning groove; In the trimming process, the stamping die is provided with a positioning pin whose position corresponds to that of the positioning groove, and the positioning pin is parallel to the central axis of the bushing; fit the positioning pin with the positioning groove and machine the lug; with respect to the position of the central axis of the bushing, there is a second preset angle between the lug and the anti-rotation groove.

2. The processing method for improving the processing quality of the lifting bushing according to claim 1, wherein Machine the anti-rotation groove in the turning process by a grooving tool; the grooving tool is provided with one cutting edge, and the height of the tool of the grooving tool is less than the diameter of the inner hole.

3. The processing method for improving the processing quality of the lifting bushing according to claim 2, characterized in that, The height of the tool of the grooving tool is less than the radius of the inner hole.

4. The processing method for improving the processing quality of the lifting bushing according to claim 2, characterized in that, The grooving tool cuts the anti-rotation groove by a micro pecking machining method.

5. The processing method for improving the processing quality of the lifting bushing according to claim 2, wherein, When the grooving tool machines the anti-rotation groove, the grooving tool feeds 10-15 wires each time, then retracts the tool, discharges the metal chips and then makes the next feed.

6. The processing method for improving the processing quality of the lifting bushing according to claim 2, characterized in that, There are two groups of the anti-rotation grooves and positioning grooves, the positions of the two anti-rotation grooves are symmetrical with respect to the central axis of the bushing, and the positions of the two positioning grooves are symmetrical with respect to the central axis of the bushing; when machining the anti-rotation grooves, first machine one anti-rotation groove, then clamp the part and rotate it 180° around the central axis of the bushing, and then machine the other anti-rotation groove.

7. The processing method for improving the processing quality of the lifting bushing according to claim 1, characterized in that, Both the first preset angle and the second preset angle are 45°.

8. A processing system for improving the processing quality of a bushing, characterized in that, A processing method for implementing the method for improving the processing quality of the bushing according to any one of claims 1 to 7; the processing system includes a turning system; the turning system includes a fixture for clamping the bushing material and a grooving tool; the grooving tool is provided with one cutting edge, and the height of the tool of the grooving tool is less than the diameter of the inner hole.

9. The processing system for improving the processing quality of the lifting bushing according to claim 8, wherein, The processing system further includes a stamping system; the stamping system includes a stamping die, and a positioning pin is arranged inside the stamping die; the positioning pin is parallel to the central axis of the bushing; the position of the positioning pin corresponds to that of the positioning groove.

10. The processing system for improving the processing quality of the lifting bushing according to claim 8, characterized in that, The cross section of the positioning groove is a semi-circular arc, and the shape of the positioning pin matches that of the positioning groove.

Images