CN111618115A - An extruder and its large-sized L-shaped profile extrusion die for aviation - Google Patents

Abstract

The present application discloses a large-sized L-shaped profile extrusion die for aviation, which includes a guide die and a forming die. The guide die is provided with a guide hole through which an ingot can flow to form an intermediate blank. The die is provided with a die hole for the intermediate blank to flow through to form a profile, and the die hole has the same cross-sectional shape as the profile; the size of the guide hole is larger than that of the die hole, and the die hole has the same shape as the profile. In the flow direction of the ingot, the whole can be projected inside the guide hole. In the extrusion die provided by the present application, a guide die is added between the forming die and the aluminum ingot, so that the aluminum metal can be pre-deformed before flowing into the die hole, and the friction of the aluminum metal by the hole wall of the guide hole is used. The resistance achieves the purpose of reducing the difference in the flow rate of the metal in each part of the section. The present application also discloses an extruder including the above-mentioned large-sized L-shaped profile extrusion die for aviation.

Description

An extruder and its large-sized L-shaped profile extrusion die for aviation

technical field

The present application relates to the field of material processing equipment, in particular to a large-sized L-shaped profile extrusion die for aviation. In addition, the present application also relates to an extruder comprising the above-mentioned large-size L-shaped profile extrusion die for aviation.

Background technique

Large-sized aluminum profiles for special purposes in national defense construction, with a fixed length of 8-11 meters, based on functional requirements, high requirements on shape, position and dimensional accuracy, and the technical indicators of bending and twisting degree meet GB/T14846 "Aluminum and Aluminum Alloy Extrusion" Profile Dimension Deviation" requirements for high-precision or ultra-high-precision.

Figure 1 shows the cross-sectional shape of an example of an L-shaped profile for aviation used in the present invention, the product specification is EL4180, and the alloy state is 7000 series superhard aluminum alloy. The maximum circumscribed circle of the profile section is 515mm, the width-thickness ratio is 19.5mm, and the maximum wall thickness is 60mm. Since the section of the profile shown in Figure 1 is extremely asymmetrical, the profile only has a side wall with a larger cross-sectional area at one end of the bottom beam in the transverse direction, and the cross-sectional area of the side wall accounts for 38.9% of the total cross-sectional area of the profile. No metal entity.

Due to the extremely asymmetric section of the profile, the unbalanced metal flow rate during extrusion will cause the metal flow rate on the side wall of the profile to be fast, the profile will deflect in the lateral direction, and twist in the circumferential direction, resulting in severe knife-shaped bending and twisting deformation, as shown in Figure 2. The consequence is that it is not easy to effectively straighten the profiles through subsequent straightening operations to meet the technical requirements. Secondly, it is very dangerous that the product flows out of the die hole unbalanced during extrusion, and the lateral deflection or circumferential torsion will cause the side wall side to rub the discharge channel of the die system, resulting in blockage of the die, and the production cannot continue, resulting in Serious production accident. The difficulty also lies in the fact that the alloy used for this profile as an aviation structural material is a 7000 series super-hard aluminum alloy, and the metal fluidity is much lower than that of the 6000 series aluminum alloy widely used in the civil field. Its extrusion forming difficulty.

In order to avoid the above problems, usually, the metal flow rate balance is considered in the product design, and the profile section is designed to be symmetrical, that is, an auxiliary side wall is added to the other end of the bottom beam in the transverse direction to reduce or eliminate the lateral direction during extrusion. Bending and twisting deformation, the auxiliary side wall is mechanically removed in the later part processing stage. Obviously, adding auxiliary side walls will greatly increase the user's purchase cost, especially as aluminum alloy aviation materials, which are expensive, and the manufacturing method without auxiliary side walls has significant economic value for super-large L-shaped profiles. Under this circumstance, the design and manufacture of the mold, the key tool for forming, plays a vital role in whether the geometrical dimensions of the profile can meet the requirements of the technical conditions or whether the normal extrusion production can be realized.

To sum up, the design and manufacture of extrusion dies are very important to the successful production of extremely asymmetric L-shaped profiles. Therefore, how to overcome the obstacles caused by extremely asymmetric cross-section through reasonable die design to improve the extrusion of profiles? The straightness of the compression molding, reducing the shape defects such as bending and twisting, and obtaining a suitable cross-sectional size are technical problems to be solved by those skilled in the art.

Application content

The purpose of this application is to provide a large-size L-shaped profile extrusion die for aviation. The large-size L-shaped profile extrusion die for aviation can effectively strengthen the balance of the flow rate of each part of the aluminum metal through the addition of the guide die, and improve the Quality of products. Another object of the present application is to provide an extruder including the above-mentioned large-sized L-shaped profile extrusion die for aviation.

To achieve the above purpose, the application provides the following technical solutions:

A large-sized L-shaped profile extrusion die for aviation, which is used for the processing of profiles with a bottom beam and a side wall on one side of the bottom beam, characterized in that it includes a guide die and a forming die, the guide The flow die is provided with a guide hole for the ingot to flow through to form an intermediate blank, the forming die is provided with a die hole for the intermediate blank to flow through to form a profile, and the die hole is related to the cross-sectional shape of the profile. The outlet end face of the guide die can be installed in the die sleeve after being fitted with the inlet end face of the forming die; the size of the guide hole is larger than that of the die hole, and the die hole is located in the The flow direction of the ingot may be entirely projected inside the guide hole.

Preferably, the guide holes are equal-section through holes.

Preferably, the guide hole is used for processing the side of the bottom beam of the profile that is close to the side wall, and the upper and lower sides in the vertical direction are offset from the corresponding positions of the die holes by 25- 35mm; the guide hole is used to process the side of the bottom beam of the profile away from the side wall, and is offset by 25-35mm in the horizontal direction relative to the corresponding position of the die hole, and the upper side in the vertical direction is , The corresponding position of the lower side relative to the die hole is offset by 40-50mm; the guide hole is used to process the position of the side wall of the profile. The corresponding position offset is 8-12mm.

Preferably, each edge of the hole wall of the guide hole is connected by a circular arc surface transition, and the radius of the fillet is not less than 10mm; the guide hole is formed with the inlet end face and the outlet end face of the guide die. The edge is set to a right angle or a rounded corner with a radius of ≤3mm.

Preferably, the forming die is further provided with an empty knife hole having the same cross-sectional shape as the profile, the empty knife hole is communicated with the mold hole, and the empty knife hole is located near the mold hole and close to the mold hole. One side of the outlet end of the forming die.

Preferably, the distance between the hole wall of the hollow knife hole and the hole wall of the die hole is 3-5 mm.

Preferably, the thickness of the die hole corresponding to the side wall extruding the profile is 63-65mm, and the height is 120-122mm; the length of the die hole corresponding to the bottom edge of the profile extruding is 494-498mm ; The thickness of the die hole corresponding to the bottom beam extruding the profile is 28-29mm; the die hole corresponds to the position of the side wall extruding the profile and the bottom beam corresponding to the profile extruding. The bottom included angle is set to 100-102°.

Preferably, the bottom edge of the bottom beam of the die hole is in the shape of an arc, and the height of the arc is 0.34-0.36 mm; the top edge of the die hole is set in the shape of an arc, and the height of the arc is 0.24 mm. -0.26mm; the side wall of the bottom beam of the die hole is parallel to the vertical die centerline of the forming die, with a distance of 250-270mm; the bottom edge of the profile is arranged parallel to the horizontal die centerline of the forming die , the bottom edge is offset downward by 26.0-26.5mm.

Preferably, from the end of the bottom beam corresponding to the extruded profile away from the side wall to the die hole corresponding to the top surface of the side wall for extruding the profile, a working belt 1 zone, a working belt and a working belt are arranged in sequence. Belt 2, working belt 3, working belt 4 and working belt 5; the length of the working belt 1 is set to 4-6 mm; the length of the working belt 2 is set to 11-13 mm; The length of zone 3 is set to 9-11 mm; the length of zone 4 of the working belt is set to 24-26 mm; the length of zone 5 of the working belt is set to be 14-16 mm.

The present application also provides an extruder, including the extrusion die for large-sized L-shaped profiles for aviation as described in any one of the above.

The large-sized L-shaped profile extrusion die for aviation provided in the present application is used for the processing of profiles with a bottom beam and a side wall on one side of the bottom beam, including a guide die and a forming die. The die is provided with a guide hole for the ingot to flow through to form an intermediate blank, and the forming die is provided with a die hole for the intermediate blank to flow through to form a profile, and the die hole has the same cross-sectional shape as the profile. ; The outlet end face of the guide die can be fitted with the inlet end face of the forming die and then installed in the die sleeve; the size of the guide hole is larger than the size of the die hole, and the die hole is in the The flow direction of the ingot can all be projected inside the guide hole. The large-sized L-shaped profile extrusion die for aviation uses a guide die between the forming die and the aluminum ingot, and through the guide hole of the guide die to strengthen the balance of the flow rate of each part of the aluminum metal, the guide die The cross-section of the guide hole is related to the profile of the profile, so that the aluminum metal is pre-deformed before flowing into the die hole, and the frictional resistance of the hole wall of the guide hole to the aluminum metal is used to reduce the flow rate difference of the metal in each part of the section. the goal of.

The extruder provided by the present application is provided with the above-mentioned large-size L-shaped profile extrusion die for aviation. Since the large-size L-shaped profile extrusion die for aviation has the above-mentioned technical effect, it is provided with the large-size L-shaped profile extrusion die for aviation. The extruder of the profile extrusion die should also have corresponding technical effects.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work;

Figure 1 is a schematic structural diagram of a large-sized L-shaped profile for aviation;

Figure 2 is a schematic diagram of lateral bending that is prone to occur during extrusion of large-sized L-shaped profiles for aviation;

3 is a schematic structural diagram of a flow guide die and a forming die in a large-size L-shaped profile extrusion die for aviation provided by the application;

4 is a schematic longitudinal cross-sectional view of the assembly of the guide die, the forming die, the die sleeve, the extrusion cylinder, the extrusion pad, and the aluminum ingot;

Figure 5 is the die hole size scheme of the forming die;

Fig. 6 is the die hole working belt size scheme of the forming die;

Fig. 7 is the die hole size scheme of the guide die;

Among them: bottom beam (1-1), side wall (1-2), bottom surface (1-3), bottom beam top surface (1-4), outer side (1-5), inner side (1-6) , the top surface of the side wall (1-7), the guide mold (2-1), the guide mold inlet end (2-2), the guide hole (2-3), the guide hole outline (2-4), Forming die (3-1), inlet end of forming die (3-2), die hole (3-3), empty knife hole (3-4), working belt area 1 (3-5), working belt area 2 ( 3-6), working belt 3 (3-7), working belt 4 (3-8), working belt 5 (3-9), die sleeve (4), extrusion cylinder (5), extrusion Pad (6), aluminum billet (7).

Detailed ways

The core of the present application is to provide a large-size L-shaped profile extrusion die for aviation. The large-size L-shaped profile extrusion die for aviation can significantly improve the processing efficiency of the L-shaped profile and reduce the processing cost by adding a guide die. , reduce the subsequent processing steps. Another core of the present application is to provide an extruder including the above-mentioned large-sized L-shaped profile extrusion die for aviation.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Please refer to FIG. 3 to FIG. 7 , FIG. 3 is a schematic structural diagram of a guide die and a forming die in a large-sized L-shaped profile extrusion die for aviation provided by the application; FIG. 4 is a guide die, a forming die, a die sleeve, Schematic diagram of longitudinal section of extrusion cylinder, extrusion pad, and aluminum ingot assembly; Figure 5 is the die hole size scheme of the forming die; Figure 6 is the die hole working belt size scheme of the forming die; Figure 7 is the die hole size of the guide die Program.

In this embodiment, a large-sized L-shaped profile extrusion die for aviation is used to process a profile with a bottom beam 1-1 and a side wall 1-2 on one side of the bottom beam 1-1. The length of the bottom surface 1-3 is 485mm, the height of the bottom beam 1-1 is 26mm, that is, the height between the top surface 1-4 of the bottom beam and the bottom surface 1-3 is 26mm, the width of the side wall 1-2 is 60mm, and the width of the side wall is 60mm. The height of 1-2 is 116mm, that is, the distance between the top surface 1-7 of the side wall and the bottom surface 1-3 is 116mm, the angle between the side wall 1-2 and the bottom beam 1-1 is 101°, and the side wall The radius of the transition fillet between 1-2 and the bottom beam 1-1 is 10mm.

The extrusion die includes a guide die 2-1 and a forming die 3-1. The guide die 2-1 is provided with a guide hole 2-3 for the ingot to flow through to form an intermediate blank. There is a die hole 3-3 for the intermediate blank to flow through to form the profile. The die hole 3-3 has the same cross-sectional shape as the profile, and the shape of the guide hole 2-3 is related to the cross-sectional shape of the profile.

Specifically, the guide mold 2-1 includes an inlet end 2-2 of the guide mold and an outlet end of the guide mold 2-1, and the forming mold 3-1 includes an entrance end 3-2 of the forming mold and an outlet end of the forming mold 3-1. The outlet end face of the guide die 2-1 can be installed in the die sleeve 4 after being fitted with the inlet end face of the forming die 3-1; the size of the guide hole 2-3 is larger than that of the die hole 3-3, and the die hole 3 -3 can be all projected inside the guide hole 2-3 in the flow direction of the ingot.

More specifically, the extrusion die is composed of a guide die 2-1 and a forming die 3-1, which are used in combination. The end face of the inlet end 2-2 of the guide die is in contact with the ingot. The outlet end face is in contact with the inlet end face of the forming die 3-1. The guide die 2-1 and the forming die 3-1 are assembled in the die sleeve 4 and used in cooperation with tools such as the extrusion cylinder 5. The aluminum ingot 7 is placed in the circular hole of the extrusion cylinder 5, one end is in contact with the inlet end 2-2 of the guide die, and one end is in contact with the end surface of the extrusion pad 6. Pushed by the extrusion force, the extrusion pad 6 moves towards the direction of the mold, so that the aluminum ingot 7 is plastically deformed, and the aluminum metal flows into the guide hole 2-3 of the guide die 2-1, and then flows into the guide hole 2-3 of the forming die 3-1. Die hole 3-3. Under the radial constraint of the die hole 3-3 of the forming die 3-1, the aluminum metal passes through the die hole 3-3 to become a long strip-shaped aluminum product with a stable cross-section in the longitudinal direction, that is, a profile.

The large-sized L-shaped profile extrusion die for aviation uses a guide die 2-1 between the forming die 3-1 and the aluminum ingot 7, and the guide die 2-3 is passed through the guide hole 2-3 of the guide die 2-1. To strengthen the balance of the flow velocity of each part of the aluminum metal, the cross-section of the guide hole profile 2-4 of the guide die 2-1 is related to the profile cross-section of the profile, so that the aluminum metal can be pre-deformed before flowing into the die hole 3-3. , and use the frictional resistance of the hole wall of the guide hole 2-3 to the aluminum metal to reduce the difference in the flow rate of the metal in each part of the section.

On the basis of the above-mentioned embodiments, the thickness of the guide die 2-1 is optional, preferably 60-120mm, and the example of the present invention is 100mm; the outer diameter of the guide die 2-1 is optional, and this example is 700-800mm. The thickness of the forming die 3-1 is optional, preferably 120-180 mm, and the example of the present invention is 150 mm; the outer diameter of the forming die 3-1 is optional, preferably 700-800 mm. The dimensions of the other outer wheels of the guide die 2-1 and the forming die 3-1 are determined based on matching with the relevant assembly parts, which are not the key elements of the present invention, and therefore will not be described further.

On the basis of the above-mentioned embodiments, the guide holes 2-3 are equal-section through holes, that is, the guide holes 2-3 have equal cross-sections in the extending direction from the inlet end 2-2 to the outlet end of the guide die.

On the basis of the above-mentioned embodiments, the guide hole 2-3 is used to process the bottom beam 1-1 of the profile on the side close to the side wall 1-2, and the upper and lower sides in the vertical direction are opposite to the die hole 3 The corresponding positions of -3 are offset by 25-35mm; specifically, the middle of the bottom beam 1-1 is close to the center of the mold, and the metal fluidity is better than that of the bottom beam 1-1 without side walls 1-2. 1. The wall is thin, and the upper and lower sides of the guide hole 2-3 in the vertical direction are offset relative to the die hole 3-3 by 30mm each.

On the basis of the above-mentioned embodiments, the side of the bottom beam 1-1 that is used to process the profile away from the side wall 1-2 of the guide hole 2-3 is offset from the corresponding position of the die hole 3-3 in the horizontal direction 25-35mm, the upper and lower sides in the vertical direction are offset by 40-50mm from the corresponding positions of die holes 3-3; ” and “close to the inner wall of the extrusion cylinder 5, the frictional resistance is large”, and the metal fluidity is the worst. The horizontal direction is offset by 30mm relative to the die hole 3-3, and the upper side and the lower side in the vertical direction are each offset by 45mm relative to the die hole 3-3.

On the basis of the above-mentioned embodiments, the guide holes 2-3 are used to process the position of the side wall 1-2 of the profile. The corresponding position is offset by 8-12mm; specifically, the metal solid area at the side wall 1-2 is the largest, where the metal fluidity is the strongest part on the forming section, and the frictional resistance of the side wall of the guide hole 2-3 needs to be used In order to suppress the metal flow to balance the metal flow rate on the entire section, the space of the guide hole 2-3 should be greatly limited, and the top surface of the die hole 3-3 on the side wall 1-2 and the outer side 1- 5. The inner side 1-6 are offset by 10mm each. Obviously, since the side wall of the guide hole 2-3 is very close to the die hole 3-3, its frictional resistance to the metal flowing therethrough is very obvious.

On the basis of the above embodiments, the edges and corners of the hole walls of the diversion holes 2-3 are connected by arc surfaces, and the radius of the corners is not less than 10mm; specifically, in order to reduce the turbulent flow caused by the sharp corners , the edges and corners of the hole walls of the diversion holes 2-3 are connected by a circular arc surface transition, and the radius of the fillet is optional, preferably not less than R10mm.

On the basis of the above embodiments, the edges formed by the guide hole 2-3 and the inlet end face and the outlet end face of the guide die 2-1 are set as right angles or rounded corners with a radius of ≤3mm. Specifically, the edge formed by the guide hole 2-3 and the inlet end face and the outlet end face of the guide die 2-1 is set to be a rounded corner or a right angle with a fillet radius not greater than R3.

On the basis of the above embodiments, the forming die 3-1 is further provided with an empty knife hole 3-4 having the same cross-sectional shape as the profile, the empty knife hole 3-4 is communicated with the die hole 3-3, and the empty knife hole 3-4 is 3-4 is located on the side of the die hole 3-3 close to the outlet end of the forming die 3-1.

Specifically, the die hole 3-3 of the forming die 3-1 plays a guiding role for the metal, so as to achieve the role of shaping the section size of the profile. The cross-sectional size of the empty knife hole 3-4 is larger than that of the forming hole. Its function is to keep the aluminum metal out of contact with the mold metal, so as to prevent the mold from rubbing the surface of the profile. Move as far as possible in the extrusion direction.

It should be noted here that the size of the die holes 3-3 is determined based on the nominal size of the profile section, dimensional tolerance, metal expansion coefficient, deformation temperature, stretching and straightening process and other parameters.

On the basis of the above embodiments, the distance between the hole wall of the hollow knife hole 3-4 and the hole wall of the die hole 3-3 is 3-5 mm.

On the basis of the above embodiments, the thickness of the die hole 3-3 corresponding to the side wall 1-2 of the extruded profile is 63-65mm, and the height is 120-122mm; the die hole 3-3 corresponds to the bottom of the extruded profile. The length of the side is 494-498mm; the thickness of the die hole 3-3 corresponding to the bottom beam 1-1 of the extruded profile is 28-29mm; the position of the die hole 3-3 corresponding to the side wall 1-2 of the extruded profile is the same as The bottom included angle of the bottom beam 1-1 corresponding to the extruded profile is set to 100-102°.

Specifically, the width of the side wall 1-2 of the die hole 3-3, that is, the thickness corresponding to the side wall 1-2 of the extruded profile, is set to 65mm; the height of the side wall 1-2 of the die hole 3-3 is set is 121mm; the length of the bottom edge of the die hole 3-3, that is, the length of the bottom edge corresponding to the extruded profile, is set to 496mm; the height of the bottom beam 1-1 of the die hole 3-3, that is, corresponding to the extruded profile The thickness of the bottom beam 1-1 of the profile is set to 28.6mm; the angle between the side wall 1-2 of the die hole 3-3 and the bottom beam 1-1 is set to 101 degrees.

On the basis of the above embodiments, the bottom edge of the bottom beam 1-1 of the die hole 3-3 is in the shape of an arc, and the height of the arc is 0.34-0.36mm; the top edge of the die hole 3-3 is set as an arc Shape, the height of the arc is 0.24-0.26mm; specifically, due to the elastic deformation of the mold in the extrusion state, the bottom surface 1-3 of the profile will have a concave defect, that is, a plane gap. In order to offset the dimensional changes caused by the elastic deformation of the mold, and to avoid the plane clearance from being out of tolerance and the profile being scrapped, the bottom edge of the mold hole 3-3 is set to an arc shape, and the height of the arc is 0.35mm. In the same way, in order to offset the influence of the elastic deformation of the mold, the top edge of the bottom beam 1-1 of the mold hole 3-3 is set as an arc shape, and the height of the arc is 0.25mm.

On the basis of the above embodiments, the side of the bottom beam 1-1 of the die hole 3-3 without the side wall 1-2 is parallel to the vertical die centerline of the forming die 3-1, and the distance is 250-270mm; The horizontal mold center lines of the forming mold 3-1 are arranged in parallel, and the bottom edge is offset downward by 26.0-26.5 mm. Specifically, since the section of the profile is extremely asymmetrical, it is not suitable for the geometric center of the section to coincide with the axis of the forming die 3-1. In order to balance the flow rate of the metal, in the present invention, the part of the side wall 1-2 of the die hole 3-3 is deviated from the axis of the forming die 3-1 further away. In this example, the bottom beam 1-1 of the die hole 3-3 without side walls 1-2 is parallel to the vertical mold centerline of the forming die 3-1, and the distance is 260mm; the bottom edge of the profile is parallel to the horizontal die of the forming die 3-1. The center lines are arranged in parallel, and the bottom edge is offset downward by 26.1mm.

Further, the hole wall of the die hole 3-3 is a combination of continuous planes or curved surfaces, which is called a working belt. The length of the working belt in the extrusion direction is different in the circumferential direction of the die hole 3-3 to adjust the metal flow rate, and strive to make the metal flow rate of each part flowing through the die hole 3-3 as the same as possible. If the metal flow rate difference between the parts flowing through the die holes 3-3 is large, the extruded profile will be deflected and twisted. Obviously, whether the shape and length of the working belt are reasonable is one of the key elements for the successful implementation of the present invention.

Specifically, the die holes 3-3 are sequentially provided with working belts from the end of the bottom beam 1-1 corresponding to the extruded profile away from the side wall 1-2 to the top surface of the side wall 1-2 corresponding to the extruded profile 1 zone 3-5, work zone 2 zone 3-6, work zone 3 zone 3-7, work zone 4 zone 3-8 and work zone 5 zone 3-9; the length of work zone 1 zone 3-5 is set to 4 -6mm; the length of work belt 2 zone 3-6 is set to 11-13mm; the length of work zone 3 zone 3-7 is set to 9-11mm; the length of work zone 4 zone 3-8 is set to 24-26mm; The length of zone 5 3-9 is set to 14-16mm.

More specifically, because being close to the center of the mold is conducive to the flow of metal, the length of the working belt 2 zone 3-6 is set to 12 mm; considering that it is far away from the center of the die hole 3-3, and the wall thickness is thin, the metal fluidity is the worst, and the working belt zone 1 The length of 3-5 is set to 5mm; although the height of die hole 3-3 is the same as that of working belt 3-6 in zone 2, but it is far from the center of the die, the metal flow becomes worse, and the height of working zone 3-7 in zone 3 is the same. The length is set to 10mm; although the distance from the center of the die hole 3-3 is extremely unfavorable for the metal flow, the solid metal of the side wall 1-2 is the largest, which greatly promotes the flow of the metal, so the length of the working belt 4 zone 3-8 is set It is 25mm; considering the farthest distance from the center of the mold and the large frictional resistance at the corners, and considering the large solid metal, the length of the working belt 5 area 3-9 is smaller than that of the working belt 4 area 3-8, but greater than that of the working belt 1 Zone 3-5, Zone 2, Zone 3, set to 15mm.

It should be noted here that in order to prevent the friction of the metal between the working belts from changing sharply and to avoid obvious extrusion streaks on the surface of the extruded profile, the working belts between adjacent working belts are inclined transitions. connect. In this mold, the guide mold 2-1 is arranged between the forming mold 3-1 and the aluminum ingot 7, so that the aluminum metal will flow into the mold hole 3-3 before the aluminum metal flows into the mold hole 3-3. The flow rate is pre-equilibrated.

In addition to the above-mentioned large-size L-shaped profile extrusion die for aviation, the application also provides an extruder including the above-mentioned large-size L-shaped profile extrusion die for aviation. Specifically, the extrusion force of the profile example is selected to reach 10,000 tons The above heavy-duty extruder extrusion production. Also, the example of the profile is produced by extrusion using a circular extrusion barrel 5 with an inner hole diameter of not less than 650 mm configured by the aforementioned extruder. For the structure of other parts of the extruder, please refer to the prior art, which will not be repeated here.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The large-sized L-shaped profile extrusion die for aviation provided by the present application has been described in detail above. Specific examples are used herein to illustrate the principles and implementations of the present application, and the descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present application, several improvements and modifications can also be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims (10)

1. A large-size L-shaped profile extrusion die for aviation is used for machining a profile which is provided with a bottom beam (1-1) and one side of the bottom beam (1-1) is provided with a side wall (1-2), and is characterized by comprising a guide die (2-1) and a forming die (3-1), wherein a guide hole (2-3) through which an ingot can flow to form an intermediate blank is formed in the guide die (2-1), a die hole (3-3) through which the intermediate blank can flow to form the profile is formed in the forming die (3-1), and the cross section shape of the die hole (3-3) is the same as that of the profile; the outlet end face of the diversion mold (2-1) can be attached to the inlet end face of the forming mold (3-1) and then is installed in the mold sleeve (4); the size of the flow guide hole (2-3) is larger than that of the die hole (3-3), and the die hole (3-3) can be totally projected inside the flow guide hole (2-3) in the flow direction of the cast ingot.

2. The large-size L-shaped profile extrusion die for aviation according to claim 1, wherein the diversion holes (2-3) are through holes with uniform sections.

3. The large-size L-shaped profile extrusion die for aviation according to claim 1, wherein the diversion holes (2-3) are used for machining one side, close to the side wall (1-2), of the bottom beam (1-1) of the profile, and the upper side and the lower side in the vertical direction are respectively offset by 25-35mm relative to the corresponding positions of the die holes (3-3); the diversion holes (2-3) are used for processing one side, far away from the side wall (1-2), of a bottom beam (1-1) of the profile, and are deviated by 25-35mm from the corresponding positions of the die holes (3-3) in the horizontal direction, and are deviated by 40-50mm from the corresponding positions of the die holes (3-3) on the upper side and the lower side in the vertical direction; the guide holes (2-3) are used for processing the top surface, the outer side surface (1-5) and the inner side surface (1-6) of the side wall (1-2) of the section bar, and the positions of the guide holes deviate by 8-12mm relative to the corresponding positions of the die holes (3-3).

4. The large-size L-shaped profile extrusion die for aviation according to claim 1, wherein the corners of the wall of each flow guide hole (2-3) are transitionally connected by a circular arc surface, and the radius of the circular arc is not less than 10 mm; edges formed by the diversion holes (2-3) and the inlet end face and the outlet end face of the diversion mold (2-1) are set to be right angles or round corners with the radius less than or equal to 3 mm.

5. The large-size aviation L-shaped profile extrusion die according to any one of claims 1 to 4, wherein the forming die (3-1) is further provided with a cutter-clearance hole (3-4) having the same cross-sectional shape as the profile, the cutter-clearance hole (3-4) is communicated with the die hole (3-3), and the cutter-clearance hole (3-4) is positioned on one side of the die hole (3-3) close to the outlet end of the forming die (3-1).

6. The large-size L-shaped profile extrusion die for aviation according to claim 5, wherein the distance between the hole wall of the hollow cutter hole (3-4) and the hole wall of the die hole (3-3) is 3-5 mm.

7. The large-specification L-shaped profile extrusion die for aviation according to claim 5, wherein the thickness of the die hole (3-3) corresponding to the side wall (1-2) for extruding the profile is 63-65mm, and the height is 120-122 mm; the length of the die hole (3-3) corresponding to the bottom edge of the extruded profile is 494-498 mm; the thickness of the die hole (3-3) corresponding to a bottom beam (1-1) for extruding the profile is 28-29 mm; the included angle between the position of the die hole (3-3) corresponding to the side wall (1-2) for extruding the section and the bottom of the bottom beam (1-1) for extruding the section is set to be 100-102 degrees.

8. The large-size L-shaped profile extrusion die for aviation of claim 5, wherein the bottom edge of the bottom beam (1-1) of the die hole (3-3) is in the shape of a circular arc, and the height of the circular arc is 0.34-0.36 mm; the top edge of the die hole (3-3) is set to be in an arc shape, and the height of the arc is 0.24-0.26 mm; the side of the bottom beam (1-1) without the side wall (1-2) of the die hole (3-3) is parallel to the vertical die center line of the forming die (3-1) at a distance of 250-270 mm; the bottom edge of the section bar is arranged in parallel with the horizontal die center line of the forming die (3-1), and the bottom edge is deviated by 26.0-26.5mm downwards.

9. The large-size L-shaped profile extrusion die for aviation according to any one of claims 1 to 4, wherein the die hole (3-3) is provided with a working zone 1 area (3-5), a working zone 2 area (3-6), a working zone 3 area (3-7), a working zone 4 area (3-8) and a working zone 5 area (3-9) in sequence from the end, away from the side wall (1-2), of the bottom beam (1-1) corresponding to the profile extrusion to the top surface of the side wall (1-2) corresponding to the profile extrusion; the length of the region (3-5) of the working band 1 is set to be 4-6 mm; the length of the area (3-6) of the working belt 2 is set to be 11-13 mm; the length of the region (3-7) of the working belt 3 is set to be 9-11 mm; the length of the region (3-8) of the working belt 4 is set to be 24-26 mm; the length of the zone (3-9) of the working tape 5 is set to be 14-16 mm.

10. An extruder, which comprises an aviation large-specification L-shaped profile extrusion die, and is characterized in that the aviation large-specification L-shaped profile extrusion die is the aviation large-specification L-shaped profile extrusion die as claimed in any one of claims 1 to 9.

Images