Burr pressing forming die for hub on inner side of airplane

Abstract

The utility model discloses a rough pressing forming die of an airplane inner side hub, and relates to the technical field of aviation hub manufacturing. The rough pressing forming die comprises a lower die, an upper die and an ejector rod. The lower die is provided with a die cavity, and the upper die is used for being pressed on the lower die and provided with a first boss used for being embedded into the die cavity. The ejector rod is arranged at the bottom of the lower die and provided with a second boss embedded into the die cavity, the second boss is opposite to the first boss, a gap is formed between the second boss and the first boss, and the first boss, the second boss and the die cavity jointly define a forming space of the rough pressing piece. The rough pressing forming die disclosed by the utility model can be used for preparing a rough pressing piece of a hub on the inner side of an airplane, filling of a hub cylinder wall is completed in the rough pressing forming process, the consistency of the height of the top of the cylinder wall and the overall shape and size of the rough pressing piece are ensured, and the wheel opening part of the prepared rough pressing piece is flat; and the folding defect generated in the subsequent pre-pressing forming process can be avoided, and then the finished product quality of the manufactured aircraft inner side hub can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation hub manufacturing, and more specifically to a rough pressing forming die for an aircraft inner hub. Background Art

[0002] Figure 1 An axonometric view of an aircraft inner wheel hub in the prior art is shown. Figure 2 The figure below is a cross-sectional view of the hub forging. This hub forging is a typical wheel hub forging. It is a rather complex large aluminum alloy forging with a maximum overall dimension of Φ615mm×290mm and a maximum depth of 250mm in the cylindrical part. The outer wall of the hub forging has a thickness of only 7mm at the smallest point and 13mm at the thickest point, indicating that this is a part with deep-tube and thin-wall characteristics. On the inner side of the thinner cylindrical bottom of the hub forging, there are 9 evenly distributed raised structures (bottom raised 10), and there are 9 complex-shaped raised structures (top raised 11) at the corresponding upper flange. These raised structures are relatively high, but have a relatively small projected area, which makes them difficult to fill during the forming process. These parts are difficult to form and prone to defects. In addition, there are 18 through holes 12 distributed at the connection position between the central I-shaped structure and the outer cylindrical structure.

[0003] At present, the forming of the inner wheel hub of an aircraft generally adopts the method of pre-pressing and final pressing. However, the disadvantage of this method is that the filling of the wheel hub barrel wall and the thickening forming of the wheel mouth need to be realized at the same time during the pre-pressing stage, which leads to forging difficulties in the forming process of the barrel wall back extrusion and the flange area gathering zone: in the early stage of forming, due to the uneven placement of the blank and the lubrication of the barrel wall, the filling speed of the wheel hub side wall may be uneven, making the front end of the barrel wall uneven, which will increase the risk of folding defects in the thickening forming stage of the wheel mouth. In addition, since the height-to-diameter ratio of the gathering zone during upsetting is too large, it is easy to cause instability defects in this position, making it difficult to guarantee the quality of the final hub forging.

[0004] Therefore, how to ensure the quality of the finished product of the inner wheel hub of the aircraft has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a rough pressing forming die for an aircraft inner wheel hub, so as to ensure the quality of the finished product of the aircraft inner wheel hub.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A rough pressing forming die for an aircraft inner wheel hub, comprising:

[0008] A lower mold is provided with a mold cavity;

[0009] An upper die, used for pressing against the lower die, and provided with a first boss for embedding into the die cavity;

[0010] A push rod is arranged at the bottom of the lower mold and is provided with a second boss embedded in the mold cavity, the second boss is opposite to the first boss and has a gap, and the first boss, the second boss and the mold cavity are used to jointly enclose a molding space for a rough pressed part.

[0011] Optionally, in the above-mentioned rough pressing molding die of the inner wheel hub of the aircraft, the sides of the lower mold and the upper mold facing each other are respectively a lower pressing surface and an upper pressing surface, one of the upper pressing surface and the lower pressing surface is provided with a first positioning portion, and the other is provided with a second positioning portion for positioning and cooperating with the first positioning portion.

[0012] Optionally, in the rough pressing forming die of the aircraft inner wheel hub, the first positioning portion includes a lock buckle, and the second positioning portion includes a lock groove for the lock buckle to be embedded in; and / or,

[0013] The first positioning portion includes a positioning hole, and the second positioning portion includes a positioning column for embedding in the positioning hole.

[0014] Optionally, in the rough pressing mold of the inner wheel hub of the aircraft, the number of the locking buckles and the number of the positioning holes are both multiple and are alternately arranged around the circumference of the first boss.

[0015] Optionally, in the rough pressing forming mold for the inner wheel hub of the aircraft, the main bodies of the lower mold and the upper mold are both in the shape of a rectangular parallelepiped, and there are two locking buckles and two positioning holes, which are arranged diagonally.

[0016] Optionally, in the above-mentioned rough pressing molding die for the inner wheel hub of the aircraft, an annular groove is provided on the side of the lower die facing the upper die, the annular groove is arranged around the die cavity, and when the upper die and the lower die are pressed together, the annular groove is connected to the die cavity.

[0017] Optionally, in the rough pressing forming mold for the inner wheel hub of the aircraft, a push rod mounting hole is provided through the bottom of the lower mold, the push rod mounting hole is communicated with the mold cavity, and the push rod mounting hole is a step-shaped structure with a step surface, and the step surface is arranged toward the direction inside the mold cavity;

[0018] A positioning ring is provided between the ejector pin and the second boss. The positioning ring and the ejector pin are both embedded in the ejector pin mounting hole. The first end face of the positioning ring is in contact with the step surface, and the second end face is flush with the bottom wall of the mold cavity.

[0019] Optionally, in the rough pressing mold of the aircraft inner wheel hub, the connection portion between the positioning ring and the second boss is rounded.

[0020] Optionally, in the rough pressing forming die for the inner wheel hub of the aircraft, the ends of the first boss and the second boss embedded in the mold cavity are both rounded structures;

[0021] The connection between the bottom wall and the side wall of the mold cavity is in a rounded transition;

[0022] The connection portion between the first boss and the upper mold is in a rounded transition.

[0023] Optionally, in the above-mentioned rough embossing mold for the inner wheel hub of the aircraft, the cross-sectional area of ​​the first boss is greater than the cross-sectional area of ​​the second boss.

[0024] The utility model provides a rough pressing forming die for the inner wheel hub of an aircraft, comprising a lower die, an upper die and a push rod. The lower die is provided with a die cavity, the upper die is used to be pressed tightly on the lower die, and is provided with a first boss for embedding in the die cavity; the push rod is provided at the bottom of the lower die, and is provided with a second boss embedded in the die cavity, the second boss is opposite to the first boss, and has a gap, and the first boss, the second boss and the die cavity are enclosed together to form a forming space for the rough pressing part.

[0025] Compared with the prior art, the rough pressing forming die for the inner wheel hub of an aircraft provided by the utility model can be used to prepare the rough pressing parts of the inner wheel hub of an aircraft, and complete the filling of the wheel hub cylinder wall in the rough pressing forming process, thereby ensuring the consistency of the height of the top of the cylinder wall and the overall shape and size of the rough pressing parts. The wheel mouth of the rough pressing parts is smooth, which can avoid folding defects in the subsequent pre-pressing forming process, thereby ensuring the quality of the finished product of the inner wheel hub of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is an axonometric view of an inner wheel hub of an aircraft in the prior art;

[0028] Figure 2 for Figure 1 A cross-section of the inboard hub of the midplane;

[0029] Figure 3 It is a step-by-step forming process flow chart of the aircraft inner wheel hub die forging disclosed in the embodiment of the utility model;

[0030] Figure 4 for Figure 3 Cross-section of the middle wool pressing piece;

[0031] Figure 5 for Figure 3 Sectional view of the pre-pressed part;

[0032] Figure 6 It is a structural schematic diagram of a rough pressing forming die for an aircraft inner wheel hub disclosed in an embodiment of the utility model;

[0033] Figure 7 It is a structural schematic diagram of the upper mold disclosed in the embodiment of the utility model;

[0034] Figure 8 It is a structural schematic diagram of the lower mold disclosed in the embodiment of the utility model;

[0035] Fig. 9 The present invention is a schematic structural diagram of a push rod disclosed in an embodiment of the present utility model.

[0036] Among them, 10 is a bottom protrusion, 11 is a top protrusion, 12 is a through hole, and 13 is an extension flange.

[0037] 100 is a rough pressing part, 101 is a rough pressing wheel opening, and 102 is a rough pressing cylinder wall;

[0038] 200 is a pre-pressed part, 201 is a pre-pressed wheel mouth, and 202 is a wheel mouth thickening area;

[0039] 300 is a rough pressing mold, 310 is an upper mold, 311 is a first boss, 312 is a lock buckle, 313 is a positioning hole, 320 is a lower mold, 321 is a mold cavity, 322 is a lock groove, 323 is a positioning column, 324 is a ring groove, 330 is a push rod, 331 is a second boss, and 332 is a positioning ring.

[0040] 400 is the final pressing part;

[0041] 500 for the dough. DETAILED DESCRIPTION

[0042] The core of the utility model is to disclose a rough pressing forming die for an aircraft inner wheel hub, so as to ensure the quality of the finished product of the aircraft inner wheel hub.

[0043] The following is an explanation of the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the contents of the utility model described in the claims. In addition, the entire contents of the structures represented by the following embodiments are not limited to those necessary as solutions of the utility model described in the claims. It should be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. In the absence of conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0044] Combination Figure 3-Figure 5 , the inner wheel hub forging of the aircraft in the prior art is analyzed. The cylindrical structure of the wheel hub forging has a thinner wall thickness at the bottom and a thicker wall thickness at the top, which makes it difficult to form. The height difference between the 9 top protrusions 11 and the outer flange 13 is large, and the projection area in the vertical direction is small. When designing the forging, it is necessary to increase the processing allowance in this area to reduce the difficulty of forming. At the same time, the I-shaped structure in the center of the wheel hub forging is high and complex in shape. The 18 through holes 12 and multiple bolt holes at the bottom connection need to be added with metal skins to ensure the forging of the wheel hub forging.

[0045] Based on this, a step-by-step die forging method is adopted, that is, the forging barrel wall (rough pressing part 100), the upper end gathering area (pre-pressing part 200) and the final pressing part (final pressing part 400) are formed step by step through the forming processes of rough pressing, pre-pressing and final pressing. The two positions where folding defects are prone to occur during forming are formed in separate processes, which are completed in the rough pressing forming process and the pre-pressing forming process respectively, thereby reducing the difficulty of forging forming.

[0046] Specifically, the rough pressing process mainly performs preliminary forming of the cylindrical structure of the forging, and at the same time, the metal of the forging is reasonably distributed to obtain the rough pressing part 100. The main purpose of the preliminary forming of the cylindrical structure is to reduce the situation that the metal flows outward and drags the metal at the flange to flow outward during flange forming, resulting in the inner side not sticking to the mold, thereby reducing the tendency of folding defects on the inner side of the cylindrical structure; the pre-pressing process mainly performs pre-forming of the upper flange structure of the forging, and at the same time, the amount of metal of the billet is reasonably distributed, so that the metal of each part of the forging only forms the adjacent parts, reducing the defects caused by the long-distance flow of metal during forming to obtain the pre-pressed part 200. In addition, the center ring convex structure of the forging is also pre-formed to reduce the difficulty of final pressing; the final pressing process is mainly the final forming of the forging, especially the final forming of the top convexity 11 and the bottom convexity 10 of the forging.

[0047] Combination Figure 4The structure of the rough pressed part 100 is set to be a simple cylindrical shape, and the cylinder wall (rough pressed cylinder wall 102) is thick at the bottom and thin at the top. Therefore, the rough pressed part 100 is used to avoid the rough pressed folding defects caused by the unstable quality of workers and uneven lubrication in actual working conditions. The rough pressed part 100 cooperates with the pre-pressing mold in the pre-pressing forming process to limit and guide the reasonable flow of metal in the gathering area, which can avoid the unstable bending phenomenon caused by the excessive upsetting height-to-diameter ratio at this position.

[0048] Combination Figure 6-Figure 9 Based on the above preparation ideas, the utility model discloses a rough pressing forming mold (hereinafter referred to as the rough pressing forming mold 300) for the inner wheel hub of an aircraft to complete the above rough pressing forming process and prepare a rough pressing part 100 from a cake blank 500. The rough pressing forming mold includes a lower mold 320, an upper mold 310 and a push rod 330. The lower mold 320 is provided with a mold cavity 321, the upper mold 310 is used to be pressed on the lower mold 320, and is provided with a first boss 311 for embedding in the mold cavity 321; the push rod 330 is arranged at the bottom of the lower mold 320, and is provided with a second boss 331 embedded in the mold cavity 321, the second boss 331 is opposite to the first boss 311, and has a gap, the first boss 311, the second boss 331 and the mold cavity 321 together enclose a molding space for the rough pressing part 100.

[0049] Compared with the prior art, the rough pressing forming die 300 disclosed in the utility model can be used to prepare the rough pressing part 100 of the inner wheel hub of the aircraft, and complete the filling of the wheel hub cylinder wall (rough pressing cylinder wall 102) in the rough pressing forming process, ensure the consistency of the height of the cylinder wall top and the overall shape and size of the rough pressing part 100, and the wheel mouth part (rough pressing wheel mouth 101) of the rough pressing part 100 is flat, which can avoid folding defects in the subsequent pre-pressing forming process. In addition, the rough pressing wheel mouth 101 can meet the needs of the subsequent pre-pressing forming process, and the thickening forming of the wheel mouth thickening area 202 is performed at the pre-pressing wheel mouth 201, and the forming quality is guaranteed, the repair and back-pressing processes are reduced, and the yield rate of the inner wheel hub forging is effectively improved, and the production cost is reduced.

[0050] In order to ensure the accuracy of the alignment of the lower mold 320 and the upper mold 310 during the molding process of the rough pressed part 100, the sides of the lower mold 320 and the upper mold 310 facing each other are defined as a lower pressing surface and an upper pressing surface respectively, and the lower pressing surface and the upper pressing surface are used to fit each other. A first positioning portion is provided on one of the upper pressing surface and the lower pressing surface, and a second positioning portion for positioning and cooperating with the first positioning portion is provided on the other. Through the positioning and cooperation of the first positioning portion and the second positioning portion, accurate alignment of the lower mold 320 and the upper mold 310 can be achieved.

[0051] Specifically, the first positioning portion includes a lock buckle 312 , and the second positioning portion includes a lock groove 322 for the lock buckle 312 to be embedded in; or, the first positioning portion includes a positioning hole 313 , and the second positioning portion includes a positioning column 323 for being embedded in the positioning hole 313 .

[0052] In the above-mentioned rough pressing molding die 300 , the above-mentioned locking buckles 312 , positioning holes 313 , locking grooves 322 and positioning posts 323 may be provided together, and the number is usually multiple (for example, two each), and they are alternately arranged around the circumference of the first boss 311 .

[0053] Combination Figure 7 and Figure 8 , which shows a structure in which the main body of the lower mold 320 and the lower mold 320 are both in the shape of a cuboid (the lower pressing surface and the upper pressing surface are both rectangular), and there are two lock buckles 312 and two positioning holes 313, which are arranged diagonally. In addition, the outer shape of the lower mold 320 and the lower mold 320 can also be cylindrical.

[0054] Combination Figure 6 and Figure 8 The lower die 320 is also provided with an annular groove 324, which is arranged around the die cavity 321 and is arranged on the side of the lower die 320 facing the upper die 310, and when the upper die 310 and the lower die 320 are pressed together, the annular groove 324 is connected to the die cavity 321. The annular groove 324 can be used for exhaust and to accommodate excess metal material.

[0055] When designing the mold, a jaw or a push rod 330 is designed for demoulding. Generally, after the forging is formed, the forging will remain in the lower die 320. For the wheel hub forgings with low height (small cavity 321) and thick flash, the jaw method is used for demoulding, which is convenient for operation and easier to demould. When the forging height is high (deep cavity 321) and the flash is small, the push rod 330 should be used for demoulding. For the above-mentioned wheel hub forgings, since they are cylindrical in shape and have a small draft angle, it is difficult to demould by jaw method, so the push rod 330 demoulding method is used for demoulding.

[0056] Specifically, combined Fig. 9 A push rod mounting hole is provided at the bottom of the lower mold 320, and the push rod mounting hole connects the mold cavity 321 with the outside world, and the push rod mounting hole is a step-shaped structure with a step surface, and the step surface is arranged in the direction of the mold cavity 321; a positioning ring platform 332 is provided between the push rod 330 and the second boss 331, and the push rod 330 and the positioning ring platform 332 are both embedded in the push rod mounting hole, and the first end face of the positioning ring platform 332 is in contact with the step surface, and the second end face is flush with the bottom wall of the mold cavity 321.

[0057] After the rough pressed part 100 is formed, the rough pressed part 100 can be pushed out of the mold cavity 321 by pushing the ejector pin 330 .

[0058] Combination Figure 6 The connection between the positioning ring 332 and the second boss 331 is a rounded transition, the connection between the upper mold 310 and the first boss 311 is a rounded transition, the connection between the bottom wall and the side wall of the mold cavity 321 is a rounded transition, and the ends of the first boss 311 and the second boss 331 embedded in the mold cavity 321 are both rounded structures to reduce stress concentration, improve the quality of the rough pressed part 100, reduce forging defects, and facilitate demolding.

[0059] The cross-sectional area of ​​the first boss 311 is greater than the cross-sectional area of ​​the second boss 331 , so as to prepare a rough pressed part 100 with a desired shape.

[0060] The above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. The specific technical means in some embodiments can be combined in part or in whole into another embodiment without being explicitly excluded by another embodiment. Therefore, the utility model will not be limited to the embodiments shown in this article, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A rough pressing forming die for an aircraft inner wheel hub, characterized in that: include: A lower mold (320) is provided with a mold cavity (321); An upper mold (310) is used to be pressed against the lower mold (320) and is provided with a first boss (311) for embedding into the mold cavity (321); A push rod (330) is arranged at the bottom of the lower mold (320) and is provided with a second boss (331) embedded in the mold cavity (321); the second boss (331) is opposite to the first boss (311) and has a gap therebetween; the first boss (311), the second boss (331) and the mold cavity (321) are used to jointly enclose a molding space for a rough pressed part (100).

2. The rough pressing forming die for the aircraft inner hub according to claim 1, characterized in that: The sides of the lower mold (320) and the upper mold (310) facing each other are respectively a lower pressing surface and an upper pressing surface, one of the upper pressing surface and the lower pressing surface is provided with a first positioning portion, and the other is provided with a second positioning portion for positioning and cooperating with the first positioning portion.

3. The rough pressing forming die for the aircraft inner hub according to claim 2, characterized in that: The first positioning portion comprises a lock buckle (312), and the second positioning portion comprises a lock groove (322) for the lock buckle (312) to be embedded; and / or, The first positioning portion comprises a positioning hole (313), and the second positioning portion comprises a positioning column (323) for being embedded in the positioning hole (313).

4. The rough pressing forming die for the aircraft inner hub according to claim 3, characterized in that: The locking buckles (312) and the positioning holes (313) are both multiple and are alternately arranged around the circumference of the first boss (311).

5. The rough pressing forming die for the aircraft inner hub according to claim 3, characterized in that: The main bodies of the lower mold (320) and the upper mold (310) are both in the shape of a rectangular parallelepiped, and there are two locking buckles (312) and two positioning holes (313), which are arranged diagonally.

6. The rough pressing forming die for the aircraft inner hub according to claim 1, characterized in that: A ring groove (324) is provided on a side of the lower mold (320) facing the upper mold (310); the ring groove (324) is arranged around the mold cavity (321); and when the upper mold (310) and the lower mold (320) are pressed together, the ring groove (324) is communicated with the mold cavity (321).

7. The rough pressing forming die for the aircraft inner hub according to claim 1, characterized in that: A push rod mounting hole is formed through the bottom of the lower mold (320), the push rod mounting hole is in communication with the mold cavity (321), and the push rod mounting hole is a step-shaped structure having a step surface, the step surface being arranged toward the inside of the mold cavity (321); A positioning ring (332) is provided between the ejector pin (330) and the second boss (331); the positioning ring (332) and the ejector pin (330) are both embedded in the ejector pin mounting hole; a first end face of the positioning ring (332) is in contact with the step surface, and a second end face is flush with the bottom wall of the mold cavity (321).

8. The rough pressing forming die for the aircraft inner hub according to claim 7, characterized in that: The connection portion between the positioning ring platform (332) and the second boss (331) is in a rounded transition.

9. The rough pressing forming die for the aircraft inner hub according to claim 1, characterized in that: The connection portion between the first boss (311) and the upper mold (310) is in a rounded transition; The ends of the first boss (311) and the second boss (331) embedded in the mold cavity (321) are both rounded structures; The connection portion between the bottom wall and the side wall of the mold cavity (321) is rounded transitionally.

10. The rough pressing forming die for the aircraft inner hub according to claim 1, characterized in that: The cross-sectional area of ​​the first boss (311) is greater than the cross-sectional area of ​​the second boss (331).

Images