Evenly-formed L-shaped ECAP process mold for aviation and application of evenly-formed L-shaped ECAP process mold

Abstract

The invention discloses a uniformly-formed L-shaped ECAP process mold for aviation and application thereof, and belongs to the technical field of material processing equipment. In order to solve the problems that an existing extrusion die is unbalanced in extrusion force and large in impact in the production process, the extrusion die is provided with a die support, a die body, a force application rod and a driving component, the die body is rotationally connected to the die support through a fastening ring, and the force application rod is arranged above the die body; the force application rod is matched with an external extruding machine to extrude the die body, the driving component is installed on the die support and connected with the bottom of the die support, and the driving component drives the die body to intermittently rotate and extrude aluminum ingot blanks. The die is suitable for the ECAP technology, the mechanical property of a formed part is improved while the quality of the formed part is guaranteed, the die body is convenient to disassemble, assemble, maintain and replace, stress acting on the corner of the die body in the extrusion process can be offset, and damage to the die body can be relieved.

Description

Technical Field

[0001] The invention relates to the technical field of material processing equipment, and in particular to an L-shaped ECAP process mold for aviation with uniform molding and application thereof. Background Art

[0002] With the rapid development of global aviation technology, the aviation manufacturing industry has an increasing demand for high-performance, high-precision, and lightweight materials. In particular, in the design and manufacturing of aircraft, missiles and other aircraft, large-sized L-shaped profiles are key structural parts, and their quality directly affects the overall performance, safety and reliability of aviation products. Traditional processing methods, such as forging and casting, have many limitations in the production of large-sized L-shaped profiles, such as low production efficiency, difficulty in ensuring processing accuracy, and serious material waste. With the continuous improvement of the aviation manufacturing industry's requirements for material performance, traditional methods have been unable to meet the needs of efficient and low-cost production.

[0003] As an advanced metal processing method, extrusion technology has significant advantages such as high production efficiency, high processing accuracy, and high material utilization. Through the extrusion machine, metal can be extruded to produce profiles with complex shapes and precise dimensions at one time. This technology is especially suitable for the production of large-scale, high-demand L-shaped profiles for aviation. In addition, extrusion technology also has high flexibility and adaptability, and can be used to design molds and adjust processes according to different product requirements to meet the diverse needs of the aviation manufacturing industry.

[0004] Among the existing published documents using extrusion technology, there is a Chinese patent entitled "An extruder and its large-size L-shaped profile extrusion die for aviation", with publication number CN111618115A, which includes a guide die and a forming die. The guide die is provided with a guide hole for the ingot to flow through to form an intermediate billet, and the forming die is provided with a die hole for the intermediate billet to flow through to form a profile. The die hole has the same cross-sectional shape as the profile, and the size of the guide hole is larger than that of the die hole. This prior art adds a guide die between the forming die and the aluminum ingot to pre-deform the aluminum metal before it flows into the die hole, and uses the friction resistance of the hole wall of the guide hole to the aluminum metal to achieve the purpose of reducing the metal flow rate difference of each part on the cross section.

[0005] However, when the above-mentioned prior art is used, there are still defects that the molded parts cannot be subjected to balanced extrusion pressure during the molding process and the impact on the mold is relatively large. Therefore, research and design of a processing mold that can not only enable the processed parts to be molded quickly and accurately, but also reduce the impact on the mold during the extrusion process, and at the same time facilitate subsequent maintenance and parts replacement, will make an important contribution to the sustainable development of the aviation manufacturing industry. Summary of the invention

[0006] In view of the defects existing in the above-mentioned prior art, the purpose of the present invention is to provide an L-shaped ECAP process mold for aviation with uniform molding and its application, which adopts segmented outer mold and inner mold, cooperates with force rod and driving component to realize intermittent extrusion of aluminum ingot blank at the raw material entrance of the inner mold, and at the same time, realizes stress offset at the L-shaped corner through the auxiliary molding component in the inner mold, effectively protecting the L-shaped corner of the inner mold from damage during the extrusion process, so as to solve the problems existing in the background technology.

[0007] ECAP, or equal channel angular pressing, is a process in which the extruded material is subjected to strong shear deformation at the corner of the die, while the cross-sectional size remains basically unchanged. Therefore, repeated extrusion accumulates a large amount of strain, which can be used to refine the grain size of the material. As a method that can achieve ultra-fine organization of coarse-grained metals and alloys, ECAP has gradually become a major way to achieve plastic deformation refinement and is regarded as one of the preparation technologies for bulk metal ultra-fine-grained materials. The advantage of ECAP is that it produces large plastic deformation without changing the cross-sectional area of ​​the material, thereby making repeated deformation of the material possible and obtaining large accumulated strain, which can effectively refine the grains inside the bulk material to below 1μm, thereby preparing bulk ultra-fine-grained materials.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows: In one aspect, the present invention discloses a uniformly formed L-shaped ECAP process mold for aviation, comprising a mold support and further comprising: The mold body is rotatably connected to the mold bracket through a fastening ring, and an aluminum ingot blank is placed in the mold body; A force-applying rod is arranged above the die body, and cooperates with an external extruder to extrude the die body; The driving component is installed on the mold bracket and connected to the bottom of the mold body. The driving component drives the mold body to perform intermittent rotational extrusion on the aluminum ingot blank.

[0009] A further preferred embodiment of the above technical solution is as follows: the upper end of the mold body is in an inverted cone shape, which includes an outer mold and an inner mold arranged inside the outer mold. Both the outer mold and the inner mold are segmented bending structures. The fastening ring is arranged on the outer mold, and the outer mold and the driving component are connected by a tripod.

[0010] As a further preferred embodiment, the cross section of the inner mold is rectangular, and two L-shaped forming holes are symmetrically opened on both sides of the cross section of the inner mold along the diagonal line.

[0011] As a further preferred solution, the mold body further includes an auxiliary molding component disposed in the middle of the inner mold, and the auxiliary molding component includes: The extrusion part is arranged at the upper section of the inner mold, and its upper end extends to the outside of the inner mold and cooperates with the force-applying rod; The pressing part is arranged at the lower section of the inner mold, and the bottom of the pressing part is fixedly connected to the inner mold; The corner protection part is arranged inside the inner mold and located between the extrusion part and the top pressing part.

[0012] Based on the above technical solution, further, the extrusion part includes a force disk, a first center rod and a first spring, the force disk is connected to the upper end of the first center rod and is located outside the inner mold, and the first spring is connected to the lower end of the first center rod.

[0013] Based on the above technical solution, further, the pressing part includes a second center rod and a second spring, the lower end of the second center rod is fixedly connected to the inner mold, and the second spring is connected to the upper end of the second center rod.

[0014] Based on the above technical solution, further, the corner protection part includes an arc-shaped cavity and high-density elastic rubber, the arc-shaped cavity is opened at the corner of the inner mold, and the high-density elastic rubber is filled in the arc-shaped cavity.

[0015] A further preferred embodiment of the above technical solution is that the lower end of the force-applying rod is an inverted frustum-shaped structure matched with the mold body, and the bottom of the force-applying rod is an inner concave surface.

[0016] A further preferred embodiment of the above technical solution is that the driving component includes a servo motor and a threaded shaft, the servo motor is fixedly mounted on the mold bracket through a base, and the threaded shaft is mounted on the output shaft of the servo motor and is detachably connected to the tripod.

[0017] On the other hand, the invention also discloses the application of a uniformly formed L-shaped ECAP process die for aviation in an extruder matched therewith.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is based on the design concept of ECAP, and the force rod, the driving component and the mold body are designed in coordination. The mold body is intermittently rotated 90 degrees by the driving component, and the aluminum ingot blank in the mold body is intermittently extruded by the external extruder in coordination with the force rod. The rotation and extrusion are repeated alternately to ensure that the force applied to the aluminum ingot blank when it is extruded into the inner mold is more uniform, and the molding effect is better. At the same time, the uniform force acting on the inner mold can reduce the damage to the inner mold, reduce the failure rate of the inner mold, and thus reduce the later parts maintenance cost.

[0019] 2. The present invention sets the upper end of the inner mold into a progressive trapezoidal structure, which is beneficial for the inner mold to fully contact the lubricating oil on the inner wall of the outer mold during the intermittent extrusion process, thereby reducing the damage to the inner mold as much as possible. At the same time, the outer mold is progressively tightened in combination with the fastening ring and the external thread, and the rubber pad inside the outer mold progressively extrude the upper end of the inner mold to achieve error adjustment of the progressive trapezoidal structure of the upper end of the inner mold. Under the premise of ensuring the error conditions, the stress caused by the extrusion process is offset, thereby reducing the damage to the inner mold.

[0020] 3. By setting an auxiliary forming component in the inner mold and combining the working characteristics of intermittent extrusion, during the extrusion process, the force rod pushes the extrusion part downward synchronously when extruding the aluminum ingot blank, and the high-density elastic rubber is squeezed and deformed in the arc cavity through the cooperation of the extrusion part and the top pressure part, and an outward extrusion force is generated on both sides of the extrusion channel at the arc cavity, thereby offsetting the stress generated at the L-shaped corner. Combined with the molding principle of repeated extrusion of the ECAP process, the molding difficulty at the corner of the L-shaped formed part is reduced while reducing the damage to the inner mold at the L-shaped corner.

[0021] 4. By setting the outer mold and the inner mold as a segmented structure, the corresponding parts of the outer mold and the inner mold can be added or replaced according to the production needs of special workpieces, thereby improving the utilization rate of the mold body. At the same time, when the inner mold is damaged, it is easy to disassemble and repair or directly replace the damaged section, without the need to replace the entire inner mold, effectively reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0023] Figure 1 It is a schematic diagram of the overall structure of an L-shaped ECAP process mold for aviation with uniform molding according to the present invention; Figure 2 It is another angle schematic diagram of the overall structure of the present invention; Figure 3 A longitudinal cross-sectional view of the overall result of the present invention; Figure 4 is an enlarged cross-sectional view of the mold body of the present invention; Figure 5 A diagram showing the positional relationship between the force-applying rod and the upper end of the mold body of the present invention; Figure 6 It is a position relationship diagram of the aluminum ingot blank in the mold body of the present invention; Figure 7 It is a schematic diagram of the connection relationship between the mold body and the fastening ring of the present invention; Figure 8It is a schematic diagram of the connection relationship between the driving component and the tripod of the present invention; Fig. 9 is a cross-sectional view of a driving member of the present invention; Fig.10 is a longitudinal cross-sectional view of a mold body in Embodiment 2 of the present invention; Fig.11 This is an enlarged structural diagram of the corner protection portion in the second embodiment of the present invention; Fig.12 It is a schematic diagram of the overall structure of the inner mold of the present invention; Fig.13 It is a structural schematic diagram of the L-shaped forming hole of the inner mold of the present invention; Fig.14 is a cross-sectional view of the inner mold of the present invention; In the figure: 1. mold bracket; 11. support platform; 12. support rod; 2. mold body; 21. outer mold; 211. external thread; 22. inner mold; 221. L-shaped molding hole; 222. installation channel; 23. auxiliary molding component; 231. extrusion part; 2311. force plate; 2312. first center rod; 2313. first spring; 232. top pressure part; 2321. second center rod; 2322. second spring; 233. corner protection part; 2331. arc cavity; 2332. high-density elastic rubber; 3. force rod; 4. driving member; 41. servo motor; 42. threaded shaft; 43. bushing; 44. support tray; 45. base; 5. fastening ring; 6. aluminum ingot blank; 7. tripod. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Embodiment 1

[0025] Reference Figure 1-9 The present invention proposes an L-shaped ECAP process mold for aviation with uniform molding, including a mold support 1, a mold body 2, a force rod 3 and a driving component 4. The mold body 2 is rotatably connected to the mold support 1 through a fastening ring 5. The force rod 3 is arranged above the mold body 2. The force rod 3 cooperates with an external extruder to extrude the mold body 2. The driving component 4 is installed on the mold support 1, and the driving component 4 is connected to the bottom of the mold body 2. The mold body 2 is driven by the driving component 4 to intermittently rotate and extrude the aluminum ingot blank 6. The aluminum ingot blank 6 is placed at the upper end of the mold body 2. The aluminum ingot blank 6 in this embodiment is the blank amount required for a molded part to be processed once.

[0026] Specifically, the mold support 1 includes a support platform 11 and a support rod 12. Figure 1-2 , Figure 3 , Figure 5 As shown, the support platform 11 is stably placed on the ground, the support rod 12 is vertically connected to one end of the support platform 11 , and two fastening rings 5 ​​are provided and one end of each of them is fixedly sleeved on the upper end of the support rod 12 .

[0027] like Figure 3-4 As shown, the upper end of the mold body 2 is in an inverted cone shape, which is compatible with the inverted cone structure of the lower end of the force applying rod 3. The mold body 2 includes an outer mold 21 and an inner mold 22. The inner mold 22 is used in conjunction with the outer mold 21 and the inner mold 22 is embedded in the outer mold 21. The angles of the bending parts of the outer mold 21 and the inner mold 22 are set to 90°~130°; in this embodiment, the outer mold 21 and the inner mold 22 both adopt a segmented bending structure. The segmented structural design is convenient for meeting the processing requirements of special customized parts by adding or replacing structural parts at corresponding parts, thereby improving the utilization rate of the mold body 2. When a certain part of the inner mold 21 is damaged and needs to be repaired or replaced, there is no need to replace the inner mold 21 as a whole. Only the damaged section needs to be disassembled and replaced, which is convenient for maintenance and greatly reduces production costs.

[0028] More specifically, the outer mold 21 has four sections, and all of them are spliced ​​with a two-flap mortise and tenon structure, and there is a gap between the outer molds 21 spliced ​​with the mortise and tenon structure, such as Figure 5-7 As shown, the other end of the fastening ring 5 is rotatably sleeved on the outer mold 21. The inner side of the fastening ring 5 has an internal thread, which cooperates with the external thread 211 on the outer wall of the outer mold 21. A circle of rubber pads is fixedly connected to the inner wall of the outer mold 21 section on which the fastening ring 5 is sleeved. When the outer mold 21 rotates, the fastening ring 5 and the outer mold 21 cooperate with each other to tighten the outer mold 21. At this time, the rubber ring inside the outer mold 21 squeezes the inner mold 22 accordingly.

[0029] like Figure 8 As shown, a connecting tripod 7 is integrally formed at the lower end of the outer mold 21. There are two tripods 7. The two tripods 7 are respectively connected to the two-petal outer mold 21. The two tripods 7 are fixedly connected by bolts, and the mold body 2 is connected to the driving component 4 through the tripod 7.

[0030] The inner mold 22 has three sections, each section is engaged with each other, a forming channel is provided through the inner mold 22, and the cross section of the inner mold 22 is rectangular. In this embodiment, since the L-shaped large aviation parts to be processed are special-shaped parts in the production field, compared with standard parts, if the processing accuracy error is large, the later correction will be very difficult, which will not only reduce production efficiency and delay the construction period, but also increase the production cost of the enterprise. For this reason, the raw material inlet at the upper end of the inner mold 22 is designed as a progressive trapezoidal structure. The progressive trapezoidal structure here is set according to the accuracy requirements of the processed parts. The design of the progressive trapezoidal structure is on the one hand to provide a better lubrication effect for the inner mold 22 to contact the inner wall of the outer mold 21, thereby reducing the damage to the inner mold 22 during extrusion. On the other hand, the outer mold 21 is tightened by the rotation of the fastening ring 5 and the outer mold 21, and the rubber pad on the inner wall of the outer mold 21 is used to tighten the upper end of the inner mold 22, ensuring that the inner mold 22 has a lubrication effect while offsetting the accuracy error caused by the progressive trapezoidal structure at the upper end of the inner mold 22 to the molded part, thereby improving production efficiency and safety in the process of producing processed parts.

[0031] The force rod 3 plays a key role in the extrusion process. The upper end of the force rod 3 is connected to the external extruder, and performs vertical reciprocating motion under the action of the extruder. The lower end of the force rod 3 is directly in contact with the aluminum ingot blank 6. The extruder drives the force rod 3 to push the aluminum ingot blank 6 into the forming channel of the inner mold 22. The force rod 3 is subjected to significant load force, and the strength and bending stiffness of the force rod 3 need to be ensured; as shown in the figure, the lower end of the force rod 3 adopts an inverted cone structure, and the lower end face of the force rod 3 matches the cross-section of the aluminum ingot blank 6, and the bottom of the force rod 3 is an inner concave surface. The purpose of setting the bottom of the force rod 3 as an inner concave surface here is to ensure that the bottom of the force rod 3 contacts the aluminum ingot blank 6 first, and to ensure that the force rod 3 can exert a downward extrusion effect on the aluminum ingot blank 6 every time.

[0032] like Figure 8-9As shown, the driving member 4 includes a servo motor 41 and a threaded shaft 42. The servo motor 41 is fixedly mounted on the mold support 1 through a base 45. The threaded shaft 42 is mounted on the output shaft of the servo motor 41. A sleeve 43 is connected to the base 45. The sleeve 43 is arranged on the outside of the threaded shaft 42. The top of the threaded shaft 42 is fixedly connected to the support tray 44. The tripod 7 is detachably connected to the support tray 44. In this embodiment, the servo motor 41 is set to intermittent 90° rotation. The working process of the servo motor 41 matches the extruder. Every time the servo motor 41 rotates 90°, the force rod 3 applies a downward extrusion force to the aluminum ingot blank 6 driven by the extruder. In this process, the servo motor 41 drives the outer mold 21 and the inner mold 22 to rotate synchronously by 90° each time, so that the fastening ring 5 completes a tightening of the outer mold 21. During the tightening process of the outer mold 21, an extrusion force is generated on the inner mold 22 through the rubber pad, thereby offsetting the error generated by the progressive trapezoidal structure at the upper end of the inner mold 22. In addition, the extrusion stress generated by the outer mold 21 during extrusion can also be eliminated. Embodiment 2

[0033] In the above-mentioned embodiment 1, since the molded part of the inner mold 22 is a large-sized solid rectangle, it is not only difficult to meet the lightweight requirements of practical applications, but also the extrusion force required at the L-shaped corner is too large, and there is no auxiliary torque at the L-shaped corner, which will cause significant damage to the internal structure during the molding process. Therefore, based on the embodiment 1, the inner mold 22 is improved as follows.

[0034] like Figure 10-14 As shown, the inner mold 22 still adopts the same three-section design as in Example 1, and a two-petal structure is adopted between each section for locking along the diagonal section of the inner mold 22. Two L-shaped forming holes 221 are opened on both sides of the cross section of the inner mold 22 along the diagonal line. The L-shaped forming holes 221 are symmetrically distributed along the edge of the inner mold 22. The size of the L-shaped forming holes 221 can be designed according to actual production needs. Here, the solid molded part is improved into a thin-sheet molded part, which not only meets the lightweight requirements of the molded part, but also reduces the extrusion molding force on the L-shaped bending part.

[0035] In this embodiment, an auxiliary molding component 23 is provided in the middle of the inner mold 22 to assist in offsetting the extrusion stress at the L-shaped bend; specifically, a mounting hole 222 is provided in the inner mold 22, and the auxiliary molding component 23 is provided in the mounting hole 222. Fig.10As shown, the auxiliary molding component 23 includes an extrusion portion 231, a pressing portion 232 and a corner protection portion 233. The extrusion portion 231 is arranged at the upper section of the inner mold 22, the upper end of the extrusion portion 231 extends to the outside of the inner mold 22, and the upper end of the extrusion portion 232 cooperates with the force application rod 3, the pressing portion 232 is arranged at the lower section of the inner mold 22, the bottom of the pressing portion 232 is fixedly connected to the inner mold 22, and the corner protection portion 233 is arranged in the inner mold 22 between the extrusion portion 231 and the pressing portion 232.

[0036] like Fig.11 , Fig.14 As shown, the extrusion portion 231 includes a force disk 2311, a first center rod 2312 and a first spring 2313, the force disk 2311 is connected to the upper end of the first center rod 2312 and is integrally formed therewith, and the force disk 2311 is located outside the inner mold 22, the first center rod 2312 is inserted into the mounting hole 222, the upper end of the first spring 2313 is connected to the first center rod 2312, and the pressing portion 232 includes a second center rod 2321 and a second spring 2322, the second center rod 2321 is inserted into the mounting hole 222 and its lower end is fixedly connected to the inner mold 22 The second spring 2322 is connected to the upper end of the second center rod 2321, the corner protection part 233 includes an arc cavity 2331 and a high-density elastic rubber 2332, the arc cavity 2331 is opened at the L-shaped corner of the inner mold 22, the high-density elastic rubber 2332 is filled in the arc cavity 2331, the width of the mounting channel 222 at the arc cavity 2331 is greater than the width of the mounting channel 222 at both ends, that is, the mounting channel 222 has a "thick in the middle and thin at both ends" structure, and the lower end of the first spring 2313 and the upper end of the second spring 2322 are both in contact with the high-density elastic rubber 2332. In this embodiment, the specifications of the first spring 2313 and the second spring 2322 are set according to the extrusion force required for the produced molded part. When the first center rod 2312 is subjected to the extrusion force of the force applying rod 3, the first center rod 2312 applies pressure to the high-density elastic rubber 2332 through the first spring 2313 to extrude the high-density elastic rubber 2332. The high-density elastic rubber 2332 transmits the force to the second spring 2322. Under the joint clamping action of the first spring 2313 and the second spring 2322, the high-density elastic rubber 2332 exerts an extrusion effect on the inner wall of the arc cavity 2331. The outward extrusion force generated by the extrusion deformation of the high-density elastic rubber 2332 offsets the stress at the L-shaped corner, thereby providing a better protection for the L-shaped corner and preventing damage caused by the extrusion impact force. Embodiment 3

[0037] The uniformly formed L-shaped ECAP process mold for aviation of the present invention has the following features when actually used: The inner mold 22 and the outer mold 21 are assembled and installed on the mold support 1, and the aluminum ingot blank 6 is preheated and placed into the raw material inlet of the mold body 2, and the servo motor 41 and the external power supply of the extruder are connected, and the servo motor 41 and the extruder are adjusted to the same working frequency and then start working; The extruder drives the force rod 3 to move downward, and the bottom of the force rod 3 contacts the aluminum ingot blank 6 and squeezes the aluminum ingot blank 6 downward. The aluminum ingot blank 6 enters the two L-shaped molding holes 221 under pressure. The force rod 3 rises upward after completing one extrusion, and then the servo motor 41 rotates 90°, which drives the outer mold 22 and the inner mold 21 to rotate 90° synchronously. The outer thread 211 on the outer mold 22 cooperates with the fastening ring 5 to tighten the outer mold 21 during the rotation process. At the same time, the rubber pad inside the outer mold 21 performs progressive extrusion on the upper end of the inner mold 22, which will gradually tighten the progressive trapezoidal structure at the upper end of the inner mold 22, and adjust the error of the upper end of the molded part to meet the precision design requirements of the molded part. In addition, the 360° rotary extrusion can make the aluminum ingot blank 6 be subjected to uniform extrusion force in the mold body 2, avoiding the uneven force caused by the unidirectional extrusion of the force rod 3 at the same position. When the aluminum ingot blank 6 is formed downward to near the L-shaped bend, the remaining amount of the aluminum ingot blank 6 is lower than the height of the force disk 2311. At this time, when the force rod 3 applies force downward under the action of the extruder, the bottom surface of the force rod 3 squeezes the aluminum ingot blank 6 downward. At this time, the inner concave surface of the force rod 3 also generates a downward force on the force disk 2311, and the first spring 2313 is compressed by the first center rod 2312 to act on the high-density elastic rubber 2332. At the same time, the second center rod 2321 and the second spring 2322 located at the bottom of the inner mold 22 generate a reaction force on the high-density elastic rubber 2332. The high-density elastic rubber 2332 is squeezed by the first spring 2313 and the second spring 2322 at the same time, and the deformation of the high-density elastic rubber 2332 is used to generate an outward squeezing force on the inner wall of the arc cavity 2331, thereby enhancing the stress offset force at the L-shaped bend. When the force rod 3 is lifted, the elastic force of the first spring 2313 and the second spring 2322 is restored, so that the first center rod 2312 and the second center rod 2321 return to the corresponding positions, the high-density elastic rubber 2332 shrinks and the volume is reduced, and the L-shaped forming hole 221 at the L-shaped corner is restored to its original state, providing enough space for the next aluminum ingot blank 6 to be extruded downward. The angle extrusion of the formed part is completed by 360° rotating intermittent extrusion, which effectively reduces the difficulty of forming and reduces the damage to the inner mold at the L-shaped corner. When the molded part reaches the bottom exit of the L-shaped molding hole 221, it indicates that the molding is completed. At this time, the servo motor 41 and the extruder power supply are turned off, and the outer mold 21 and the inner mold 22 are removed in turn to take out the molded part; using the mold of the present invention, two mutually symmetrical molded parts can be produced each time extrusion is completed, which effectively reduces the molding difficulty of large-sized L-shaped workpieces, has good molding quality, and can protect the mold body 2 during the extrusion molding process, reducing damage to the mold body 2.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A uniformly formed L-shaped ECAP process mold for aviation, comprising a mold support (1), characterized in that: Also includes: A mold body (2) is rotatably connected to the mold support (1) via a fastening ring (5), and an aluminum ingot blank (6) is placed in the mold body (2); A force-applying rod (3) is arranged above the mold body (2), and the force-applying rod (3) cooperates with an external extruder to extrude the mold body (2); The driving member (4) is mounted on the die support (1) and connected to the bottom of the die body (2). The driving member (4) drives the die body (2) to intermittently rotate and extrude the aluminum ingot blank (6).

2. The uniformly formed L-shaped ECAP process mold for aviation according to claim 1, characterized in that: The mold body (2) comprises an outer mold (21) and an inner mold (22) arranged inside the outer mold (21); the outer mold (21) and the inner mold (22) are both segmented bending structures; the fastening ring (5) is sleeved on the outer mold (21); and the outer mold (21) and the driving component (4) are connected via a tripod (7).

3. The uniformly formed L-shaped ECAP process mold for aviation according to claim 2, characterized in that: The cross section of the inner mold (22) is rectangular, and two L-shaped molding holes (221) are symmetrically opened on both sides of the cross section along the diagonal line of the inner mold (22).

4. The uniformly formed L-shaped ECAP process mold for aviation according to claim 3, characterized in that: The mold body (2) further comprises an auxiliary molding component (23) arranged in the middle of the inner mold (22), and the auxiliary molding component (23) comprises: An extrusion portion (231) is arranged at the upper section of the inner mold (22), with an upper end thereof extending to the outside of the inner mold (22) and cooperating with the force application rod (3); A pressing portion (232) is disposed at the lower section of the inner mold (22), and a bottom portion thereof is fixedly connected to the inner mold (22); The corner protection portion (233) is arranged inside the inner mold (22) and is located between the extrusion portion (231) and the pressing portion (232).

5. The uniformly formed L-shaped ECAP process mold for aviation according to claim 4, characterized in that: The extrusion portion (231) comprises a force-bearing disk (2311), a first center rod (2312) and a first spring (2313); the force-bearing disk (2311) is connected to the upper end of the first center rod (2312) and is located outside the inner mold (22); and the first spring (2313) is connected to the lower end of the first center rod (2312).

6. The uniformly formed L-shaped ECAP process mold for aviation according to claim 5, characterized in that: The pressing portion (232) comprises a second center rod (2321) and a second spring (2322); the lower end of the second center rod (2321) is fixedly connected to the inner mold (22); and the second spring (2322) is connected to the upper end of the second center rod (2321).

7. The uniformly formed L-shaped ECAP process mold for aviation according to claim 6, characterized in that: The corner protection portion (233) comprises an arc-shaped cavity (2331) and a high-density elastic rubber (2332); the arc-shaped cavity (2331) is opened at the corner of the inner mold (22); and the high-density elastic rubber (2332) is filled in the arc-shaped cavity (2331).

8. The uniformly formed L-shaped ECAP process mold for aviation according to claim 2, characterized in that: The lower end of the force-applying rod (3) is an inverted frustum-shaped structure that matches the mold body, and the bottom of the force-applying rod (3) is an inner concave surface.

9. The uniformly formed L-shaped ECAP process mold for aviation according to claim 8, characterized in that: The driving component (4) comprises a servo motor (41) and a threaded shaft (42); the servo motor (41) is fixedly mounted on the mold support (1) via a base (45); the threaded shaft (42) is mounted on an output shaft of the servo motor (41) and is detachably connected to the tripod (7).

10. Application of an L-shaped ECAP process die for aviation with uniform molding in an extruder matched therewith.

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