A 90-degree bending combined tool and processing method for inner ribs of a through cover

Abstract

The present application relates to the technical field of machining, in particular to a through cover inner rib 90 degree bending combined tool and machining method, the tool includes a top post matched with the internal groove of the through cover, a positioning boss matched with the bottom groove of the through cover, the top post includes a bending post matched with the rib of the through cover, the positioning boss includes a positioning boss column matched with the rib of the through cover, and a groove matched with the rib is arranged between the positioning boss columns. According to the overall structure characteristics of the through cover, the top post and the positioning boss are designed, the bending post with the L-shaped bending groove after the round corner treatment is arranged on the top post, the positioning boss column, the first groove and the second groove cross-distributed in the cross shape are arranged on the positioning boss, the L-shaped bending groove after the round corner treatment makes the inner rib uniformly stressed as a whole, the inner rib surface will not appear indentation, the cross grooves in the horizontal and vertical directions ensure that the through cover can be arbitrarily selected during processing, and the processing efficiency is indirectly improved.

Description

A tooling assembly and processing method for bending the inner ribs of a through cover at 90°. Technical Field

[0001] This invention relates to the field of machining technology, specifically to a combination tooling and machining method for bending the inner ribs of a cover at 90°. Background Technology

[0002] In the manufacturing of aerospace spare parts, through covers are required for urgent processing, as shown in Figure 1. Conventional processing methods involve clamping the cover with pliers, holding a metal block against the rib 11, and applying pressure with a rubber mallet to bend the rib 11 at a certain angle. The bent rib 11 is then placed on the edge of the metal block with a right-angled side within the through cover 1, and bent along the right-angled side using the rubber mallet. The same method is used to bend another rib 11. Because the metal block applies pressure to the through cover 1 during the bending process, it can cause localized surface scratches, resulting in low overall processing efficiency and a high number of defective products. Therefore, a high-quality, high-efficiency processing method is needed to complete the 90° bending of the inner ribs of the through cover using existing processing conditions. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a combination tooling and processing method for bending the inner ribs of a through cover at 90°.

[0004] The technical problem to be solved by this invention is achieved by the following technical solution:

[0005] A 90° bending assembly for the inner ribs of a through cover includes a top post that mates with the inner groove of the through cover and a positioning boss that mates with the bottom groove of the through cover. The top post includes bending posts that correspond to and match the ribs of the through cover, and the positioning boss includes positioning protrusions that correspond to and match the ribs of the through cover. Grooves that match the ribs are formed between the positioning protrusions.

[0006] Preferably, the top column further includes an outer end cylinder, and the bent column is connected to the outer end cylinder. The end face edge of the bent column is provided with an L-shaped bending groove, and the size of the L-shaped bending groove is adapted to the size of the ribs of the through cover.

[0007] Preferably, the outer end cylinder and the bent column are made of cemented carbide.

[0008] Preferably, four positioning protrusions are provided, which are distributed around the positioning platform, and the dimensions between two adjacent positioning protrusions are adapted to the width of the ribs of the through cover.

[0009] Preferably, each positioning protrusion has a positioning circular side surface and a positioning right-angle side surface on its opposite outer column wall.

[0010] Preferably, the groove includes a first groove and a second groove, which are arranged in a cross shape.

[0011] Preferably, the positioning boss and positioning post are made of cemented carbide.

[0012] A method for machining a 90° bending assembly of inner ribs in a through-cover, used to machine the aforementioned 90° bending assembly of inner ribs in a through-cover, includes machining a top column and machining a positioning boss. The machining steps for the top column are as follows:

[0013] Step (A) uses a hard cutting tool to cut out the outer cylindrical body and the bent column using wire cutting technology;

[0014] Step (B) Based on the width and length of the ribs on the cover, two L-shaped bending grooves are machined on both sides of the top of the bending column;

[0015] Step (C) Round the ends of the two L-shaped bending grooves.

[0016] Preferably, the machining steps for the positioning boss are as follows:

[0017] Step (a) First, the bar stock is machined by CNC lathe end face turning to form bottom and top cylindrical bosses. The side of the top cylindrical boss is the positioning round side. At the same time, a φ2mm drill bit is used to drill a lead wire through hole at the center of the positioning boss.

[0018] Step (b) Pass the molybdenum wire of the wire EDM machine through the lead wire through hole, and use wire EDM technology to make two first grooves and second grooves at the center of the positioning boss in a positive polarity machining mode;

[0019] After the first and second grooves are machined in step (c), the positioning boss is fixed to the travel table of the wire EDM machine tool by means of screw clamping plate. The positioning boss is rotated 90° in sequence by positive polarity machining method to machine eight positioning right angle side surfaces.

[0020] Preferably, the processing parameters for the positive polarity processing method in steps (b) and (c) include: processing current of 3A to 5A, pulse width of 30μs to 50μs, and duty cycle of 1:5 to 1:7.

[0021] The beneficial effects of this invention are:

[0022] Compared with the prior art, this invention designs a top post and a positioning boss based on the overall structural features of the cover. By setting a bending post with an L-shaped bending groove with rounded corners on the top post, and setting a first groove and a second groove with a cross-shaped distribution and a positioning boss on the positioning boss, when a longitudinal force is applied to the end face of the top post, the inner rib will bend slowly, bending the horizontal inner rib to 90°. In this invention, the L-shaped bending groove with rounded corners ensures that the inner rib is uniformly stressed, and no indentation will appear on the surface of the inner rib. The cross grooves in both the horizontal and vertical directions ensure that the cover can be arbitrarily selected during processing, indirectly improving processing efficiency. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 is a schematic diagram of the structure before the through cover is processed;

[0025] Figure 2 is a schematic diagram of the structure after the through cover has been processed;

[0026] Figure 3 is a schematic diagram of the top column of the present invention;

[0027] Figure 4 is a schematic diagram of the positioning boss of the present invention;

[0028] Figure 5 is a schematic diagram of the assembly explosion of the present invention;

[0029] Figure 6 is a schematic diagram of the assembled structure of the present invention.

[0030] In the diagram: 1. Through cover; 11. Rib; 12. Bottom groove; 13. Internal groove; 2. Top post; 21. Outer cylinder; 22. Bending post; 23. L-shaped bending groove; 3. Positioning boss; 31. First groove; 32. Positioning protrusion; 33. Second groove; 34. Positioning round side; 35. Positioning right angle side. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1 shows the state of the through cover 1 before processing. The through cover 1 has two oppositely distributed ribs 11 in the bottom groove 12. The two ribs 11 are in a horizontal state. According to the process specifications, the two ribs 11 of the through cover 1 need to be bent at 90°. The two ribs 11 are bent symmetrically. The end face of the overall bend should not have indentations. Figure 2 shows the state of the through cover 1 after 90° bending.

[0033] To address the above situation, as shown in Figures 3 to 6, a 90° bending assembly for the inner ribs of a through-cover includes a top post 2 and a positioning boss 3. The top post 2 is designed based on the external features of the through-cover 1 and the two ribs 11. The positioning boss 3 is designed based on the external features of the top post 2.

[0034] The top post 2 is made entirely of hard alloy. The top post 2 includes an outer cylindrical body 21 and a bent post 22 that corresponds to and matches the ribs 11 of the through cover 1. The bent post 22 is connected to the outer cylindrical body 21, and an L-shaped bending groove 23 is provided on the end face edge of the bent post 22. The diameter of the outer cylindrical body 21 is approximately smaller than the diameter of the internal groove 13 of the through cover 1, with a difference of about 0.5mm, ensuring that the top post 2 can move within the through cover 1. The length of the bent post 22 is slightly less than the width of the distance between the two ribs 11 by about 1mm. Simultaneously, the width of the bent post 22 is consistent with the width of the bent ribs 11, allowing the bottom of the bent post 22 to quickly position itself with the through cover 1 when the top post 2 is inserted. Simultaneously, when pressure is applied, the two ribs 11 can move along the two sides of the bent post 22. The edges of the L-shaped bending groove 23 are rounded to prevent surface scratches on the ribs during pressing. The overall contour is wire-cut to avoid the corner R caused by the tool radius.

[0035] The positioning boss 3 is made entirely of hard alloy. The positioning boss 3 includes positioning protrusions 32 that correspond to and are adapted to the ribs 11 of the cover 1. Grooves adapted to the ribs 11 are formed between the positioning protrusions 32. The grooves include a first groove 31 and a second groove 33, the width of which is approximately 0.5 mm wider than the width of the rib 11. The first groove 31 and the second groove 33 are arranged in a cross pattern, and they intermittently engage with the bending post 22. The outer cylindrical body 21 is subjected to force and moves along the cross-shaped first groove 31 and second groove 33, ensuring that the cover 1 can be placed horizontally or vertically within its grooves. Four positioning protrusions 32 are provided, correspondingly distributed around the perimeter of the positioning boss 3. The dimensions between adjacent positioning protrusions 32 are adapted to the width of the ribs 11 of the cover 1. Each positioning protrusion 32 has a corresponding positioning circular side surface 34 and a positioning right-angle side surface 35 on its opposite outer cylindrical wall. The positioning circular side 34 is in clearance fit with the bottom groove 12. At the same time, when bending, it can prevent the sharp edges on both sides of the positioning boss 3 from scratching the surface of the cover 1. The positioning right-angle side 35 can ensure that the rib 11 can be effectively bent and the bent surface will not be scratched.

[0036] A method for machining a 90° bending assembly of inner ribs in a through-cover, used to machine the aforementioned 90° bending assembly of inner ribs in a through-cover, includes machining a top post 2 and machining a positioning boss 3. The machining steps for the top post 2 are as follows:

[0037] Step (A) uses a hard cutting tool to cut out the outer cylindrical body 21 and the bent column 22 using wire cutting technology.

[0038] Step (B) Based on the width and length dimensions of the ribs 11 on the cover 1, two L-shaped bending grooves 23 are machined on both sides of the top of the bending column 22.

[0039] Step (C) involves rounding the ends of the two L-shaped bending grooves 23.

[0040] The machining steps for positioning boss 3 are as follows:

[0041] Step (a) First, the bar stock is machined by CNC lathe end face turning to form bottom and top cylindrical bosses. The side of the top cylindrical boss is the positioning circular side 34. At the same time, a φ2mm drill bit is used to drill a lead wire through hole at the center of the positioning boss 3.

[0042] Step (b) The lead wire through hole described in this invention is related to the diameter of the metal wire in wire EDM. The machine tool uses φ0.2mm molybdenum wire for machining. Therefore, a φ2 drill bit is used to make a hole at the center of the fixed boss to facilitate the molybdenum wire passing through the inner hole for subsequent external cutting. Specifically: the molybdenum wire from the wire EDM machine tool is passed through the lead wire through hole, and two grooves, a first groove 31 and a second groove 33, are made at the center of the positioning boss 3 using wire EDM technology with a positive polarity machining method.

[0043] After the first groove 31 and the second groove 33 are processed in step (c), the positioning boss 3 is fixed to the travel table of the wire EDM machine tool by means of screw clamping plate. The positioning boss 3 is rotated 90° in sequence by positive polarity processing method to process eight positioning right angle side surfaces 35.

[0044] The machining parameters for the positive polarity machining method in steps (b) and (c) above include: machining current 3A to 5A, pulse width 30μs to 50μs, and duty cycle 1:5 to 1:7. The positioning boss 3 and top post 2 machined using these parameters have high surface quality. Furthermore, there is no tool fillet at the right-angled edge of the cross groove, ensuring that the 90° angle of the rib 11 is effectively maintained when it moves along the cross groove under the pressure of the bending post 22.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A tooling assembly for bending the inner ribs of a through-cover at 90°, characterized in that: The system includes a top post (2) that mates with the internal groove (13) of the cover (1) and a positioning boss (3) that mates with the bottom groove (12) of the cover (1). The top post (2) includes a bent post (22) that matches the rib (11) of the cover (1). The positioning boss (3) includes a positioning protrusion (32) that matches the rib (11) of the cover (1). A groove matching the rib (11) is provided between the positioning protrusions (32). The top post (2) also includes an outer cylinder (21). The bent post (22) is connected to the outer cylinder (21). An L-shaped bending groove (23) is provided on the edge of the end face of the bent post (22). The dimensions of the L-shaped bending groove (23) are adapted to the dimensions of the ribs (11) of the cover (1); the outer end cylinder (21) and bending column (22) are made of hard alloy; four positioning protrusions (32) are provided, which are distributed around the positioning protrusion (3), and the dimensions between two adjacent positioning protrusions (32) are adapted to the width dimensions of the ribs (11) of the cover (1); each positioning protrusion (32) has a positioning circular side surface (34) and a positioning right angle side surface (35) on its opposite outer column wall; the groove includes a first groove (31) and a second groove (33), which are arranged in a cross shape.

2. The assembly tooling for bending the inner ribs of a through cover at 90° according to claim 1, characterized in that: The positioning boss (3) and positioning post (32) are made of cemented carbide.

3. A processing method for a 90° bending assembly of inner ribs in a through-cover, characterized in that: A tooling assembly for processing the inner rib of a cover with a 90° bend, as described in any one of claims 1 to 2, includes processing of a top column (2) and a positioning boss (3). The processing steps of the top column (2) are as follows: Step (A) Using a hard tool, the outer end cylinder (21) and the bending column (22) are cut out by wire cutting technology; Step (B) According to the width and length dimensions of the rib (11) on the cover (1), two L-shaped bending grooves (23) are processed on both sides of the top of the bending column (22); Step (C) The two ends of the two L-shaped bending grooves (23) are rounded.

4. The processing method of the 90° bending assembly tooling for the inner ribs of a through cover according to claim 3, characterized in that: The machining steps of the positioning boss (3) are as follows: Step (a) First, the end face of the CNC lathe is turned to process the bar stock, and the bottom and top cylindrical bosses are machined. The side of the top cylindrical boss is the positioning circular side (34). At the same time, a φ2mm drill bit is used to drill a lead wire through hole at the center of the positioning boss (3). Step (b) The molybdenum wire of the wire EDM machine tool is passed through the lead wire through hole. The wire EDM processing technology is used to make two first grooves (31) and second grooves (33) at the center of the positioning boss (3) in a positive polarity processing mode. Step (c) After the first groove (31) and second groove (33) are machined, the positioning boss (3) is fixed to the stroke table of the wire EDM machine tool by means of screw clamping plate. The positioning boss (3) is rotated 90° in sequence in a positive polarity processing mode to machine eight positioning right angle side (35).

5. The processing method of the 90° bending assembly tooling for the inner ribs of a through cover according to claim 4, characterized in that: The processing parameters for the positive polarity processing method in steps (b) and (c) include: processing current 3A to 5A, pulse width 30μs to 50μs, and duty cycle 1:5 to 1:7.

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