Progressive Extrusion Forming Method and Device for an L-shaped Ribbed Frame Part

Abstract

The present invention relates to the technical field of metal plastic forming, and particularly relates to a progressive extrusion forming method and device for an L-shaped ribbed frame part. The progressive extrusion forming method for the L-shaped ribbed frame part comprises the following steps: S1: applying pressure to a part of a blank by using a die, extruding part of the metal of the blank into the gap between the dies or into the cavity of the die, so as to form a local rib structure; S2: moving the die to the next part of the blank to be formed; S3: applying pressure to the part of the blank to be formed by using the die to form subsequent local rib structures; repeating steps S2 and S3 until all rib structures of the L-shaped ribbed frame part are formed. By performing the overall forging of a blank with large overall dimensions in a step-by-step manner into the extrusion forming of multiple local regions, this method can reduce the equipment load, improve the near-net forming degree of the rib features, significantly improve the material utilization rate, shorten the production cycle required for subsequent machining, and reduce the manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of metal plastic forming, and particularly to a progressive extrusion forming method and device for an L-shaped ribbed frame part. Background Art

[0002] Ribbed parts are widely used in the field of aerospace frame parts due to their excellent stiffness, strength and lightweight advantages. At present, the common processing methods are mainly of two types. One method is to use integral plate machining for manufacturing. Machining has problems such as low utilization rate of milling materials, long production cycle, and easy deformation and out-of-tolerance during the machining of rib bodies. Another method is to use casting and welding to manufacture ribbed frames. Although this method can ensure a high material utilization rate, the fatigue strength of the produced ribbed parts is insufficient and it is difficult to meet the working conditions with harsh service conditions in the aerospace field. Therefore, how to reduce the manufacturing cost of ribbed parts while ensuring the strength of the parts and shorten the production cycle of ribbed parts is an urgent problem to be solved for the green manufacturing and mass production acceleration of civil aircraft. The present invention selects the common L-shaped ribbed frame part in the aviation field as the target and develops a forming method with high material utilization rate and less machining allowance. Summary of the Invention

[0003] An object of the present invention is to propose a progressive extrusion forming method for an L-shaped ribbed frame part. By gradually forging a blank with a large overall size into multiple local extrusion formations, it is possible to reduce the equipment load while forming an L-shaped ribbed frame part with high precision, high strength and large size, improve the material utilization rate, shorten the production cycle and reduce the manufacturing cost.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A progressive extrusion forming method for an L-shaped ribbed frame part includes the following steps:

[0006] S1: Apply pressure to a local part of the blank by using a mold, and extrude part of the metal of the blank into the gap between the molds or the cavity of the mold to form a local rib structure;

[0007] S2: Move the mold to the next local part of the blank to be formed;

[0008] S3: Apply pressure to the local part of the blank to be formed by using the mold to form the subsequent local rib structure;

[0009] Repeat steps S2 and S3 until all rib structures of the L-shaped ribbed frame part are formed.

[0010] Preferably, the mold includes an integral female mold, a split female mold and a local male mold. Step S1 specifically includes:

[0011] Connect the blank with the integral female die, with one side wall of the blank abutted against the side wall of the integral female die, and the top of the blank being lower than the top of the integral female die;

[0012] Place at least two split female dies on the top surface of the blank at intervals along the X-axis direction at a first preset distance, and leave a gap with a second preset distance between the split female die and the integral female die;

[0013] Place the local punch under one end of the blank, with the top surface and one side wall of the local punch abutted against the bottom surface of the blank and the side wall of the integral female die respectively;

[0014] The local punch cooperates with the split female die to extrude the blank, so that parts of the blank are respectively extruded between two adjacent split female dies and into the gap, forming a preform with a first support rib and a local side wall rib, and the first support rib and the local side wall rib are respectively parallel to the YZ plane and the XZ plane.

[0015] Preferably, the step of the local punch cooperating with the split female die to extrude the blank includes: the integral female die and the split female die are fixed, and the local punch moves a third preset distance along the Z-axis direction towards the split female die.

[0016] Preferably, the step of the local punch cooperating with the split female die to extrude the blank includes: the local punch (102) is stationary, and the split female die moves a third preset distance along the Z-axis direction towards the integral female die.

[0017] Beneficial effects:

[0018] The present invention provides a progressive extrusion forming method for an L-shaped ribbed frame part. The progressive extrusion forming method of the L-shaped ribbed frame part can effectively reduce the equipment load required for forming a large L-shaped ribbed frame part by performing the overall forging of the large L-shaped ribbed frame part in multiple local extrusion forming steps, improve the dimensional accuracy and streamline density during rib forming, enhance the product dimensional accuracy and mechanical properties, reduce the material utilization rate, shorten the manufacturing cycle of the part, and reduce the manufacturing cost of the part.

[0019] An object of the present invention is to propose a progressive extrusion forming device for an L-shaped ribbed frame part. Based on the above progressive extrusion forming method for an L-shaped ribbed frame part, the overall forging of a large-sized blank can be performed in multiple local extrusion forming steps, which can avoid the use of large molds. Making it into an integral female die, a split female die, and a local punch that can be replaced separately is easy to replace after partial die damage, and can effectively reduce the device cost.

[0020] An incremental extrusion forming device for an L-shaped ribbed frame member processes a blank using the above-mentioned incremental extrusion forming method for the L-shaped ribbed frame member. The incremental extrusion forming device is applicable to the incremental extrusion forming of L-shaped ribbed frame members with long strip or single-curved arc profiles. The mold of the incremental extrusion forming device includes an integral female die, a split female die, and a local male die. The shape of the integral female die is the same as the overall contour shape of the blank.

[0021] Preferably, when the incremental extrusion forming device is applicable to the incremental extrusion forming of an L-shaped ribbed frame member, the mold is moved a specified distance according to the forming requirements of the L-shaped ribbed frame member. Specifically, moving the mold means moving the split female die for forming or the local male die for applying pressure.

[0022] Beneficial effects:

[0023] The present invention provides an incremental extrusion forming device for an L-shaped ribbed frame member. Based on the above-mentioned incremental extrusion forming method for the L-shaped ribbed frame member, the overall forging of a blank with large overall dimensions can be carried out step by step into multiple local extrusion formations, avoiding the use of large molds. By making them into an integral female die, a split female die, and a local male die that can be replaced separately, it is easy to replace them after partial mold damage, and the device cost can be effectively reduced. Description of the drawings

[0024] Figure 1 is a schematic structural diagram of an L-shaped ribbed frame member provided by a specific embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of the cooperation between the incremental extrusion forming device of the L-shaped ribbed frame member and the blank provided by a specific embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of the first preform of the L-shaped ribbed frame member provided by a specific embodiment of the present invention;

[0027] Figure 4 is a schematic structural diagram of the cooperation between the incremental extrusion forming device of the L-shaped ribbed frame member and the first preform provided by a specific embodiment of the present invention;

[0028] Figure 5 is a schematic structural diagram of the second preform of the L-shaped ribbed frame member provided by a specific embodiment of the present invention.

[0029] Among them:

[0030] 100, integral female die; 101, split female die; 102, local male die;

[0031] 200, blank; 201, first preform; 2011, first support rib; 2012, local side wall rib; 202, second preform;

[0032] 300, L-shaped ribbed housing member; 301, ribbed member bottom plate. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0035] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0037] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation manners.

[0038] As Figures 1 to 5As shown in the figure, this embodiment provides a progressive extrusion forming method for an L-shaped ribbed frame member, which is used to process a blank 200 into an L-shaped ribbed frame member 300, and it includes the following steps:

[0039] S1: Apply pressure to a part of the blank 200 by using a mold, extrude part of the metal of the blank 200 into the gap between the molds or into the cavity of the mold, and realize the forming of the local rib structure;

[0040] S2: Move the mold to the next part of the blank 200 to be formed;

[0041] S3: Apply pressure to the part of the blank 200 to be formed by using the mold, and form the subsequent local rib structure;

[0042] Repeat steps S2 and S3 until all the rib structures of the L-shaped ribbed frame member 300 are formed.

[0043] This progressive extrusion forming method of the L-shaped ribbed frame member can effectively reduce the equipment load required for forming a large L-shaped ribbed frame member by performing the overall forging of the large L-shaped ribbed frame member step by step into multiple local extrusion formations, improve the dimensional accuracy and streamline density during rib forming, enhance the product dimensional accuracy and mechanical properties, reduce the material utilization rate, shorten the manufacturing cycle of the part, and reduce the manufacturing cost of the part.

[0044] Among them, the mold includes an integral female mold 100, a split female mold 101, and a local male mold 102. Step S1 specifically includes:

[0045] S01: Connect the blank 200 with the integral female mold 100, one side wall of the blank 200 abuts against the side wall of the integral female mold 100, and the top of the blank 200 is lower than the top of the integral female mold 100;

[0046] S02: Place at least two split female molds 101 on the top surface of the blank 200 at intervals along the X-axis direction at a first preset distance, and there is a gap with a second preset distance between the split female mold 101 and the integral female mold 100;

[0047] S03: Place the local male mold 102 below one end of the blank 200, and the top surface and one side wall of the local male mold 102 respectively abut against the bottom surface of the blank 200 and the side wall of the integral female mold 100;

[0048] S04: The local male mold 102 cooperates with the split female mold 101 to extrude the blank 200, so that parts of the blank 200 are respectively extruded between two adjacent split female molds 101 and into the gap, forming a preform with a first support rib 2011 and a local side wall rib 2012. The first support rib 2011 and the local side wall rib 2012 are respectively parallel to the YZ plane and the XZ plane.

[0049] Specifically in step S2: The local convex die 102 moves along the X-axis to the other end of the blank 200 to continue extruding the preform to form the L-shaped ribbed frame part 300.

[0050] In the progressive forming method of the L-shaped ribbed frame part, a first preset distance is left between adjacent split female dies 101 and a second preset distance is left between the split female die 101 and the integral female die 100. During the extrusion of the blank 200, part of the blank is extruded into the gap to form the required first support ribs 2011 and local side wall ribs 2012. Then, by moving the local convex die 102 along the X-axis direction to extrude it, a plurality of first support ribs 2011 and local side wall ribs 2012 are sequentially formed to obtain the final required L-shaped ribbed frame part 300. The progressive extrusion forming method of the L-shaped ribbed frame part is simple to operate. By forging the blank 200 with a large overall size step by step into multiple local extrusion formations.

[0051] In addition, since the sizes of the split female die 101 and the local convex die 102 are much smaller than the overall size of the blank 200, the requirements for the relevant equipment for respectively positioning and controlling the strokes of the split female die 101 and the local convex die 102 in terms of the table surface and load are not required to be high, and the corresponding stroke accuracy is higher, reducing the processing cost of forming the L-shaped ribbed frame part 300.

[0052] It can be understood that the top of the blank 200 being lower than the top of the integral female die 100 can ensure the guidance of the blank 200 in the Z-axis direction during extrusion, so that part of the blank 200 is extruded between the split female die 101 and the integral female die 100 to form local side wall ribs 2012 parallel to the XZ plane.

[0053] In this embodiment, the specific steps of the local convex die 102 cooperating with the split female die 101 to extrude the blank 200 include: The integral female die 100 and the split female die 101 are fixed, and the local convex die 102 moves a third preset distance along the Z-axis towards the direction close to the split female die 101. Of course, in other embodiments, it may also be that the local convex die 102 does not move, and the split female die 101 moves a third preset distance along the Z-axis towards the direction close to the integral female die 100. This embodiment does not make specific limitations.

[0054] It should be noted that the number of the first support ribs 2011 and the local side wall ribs 2012 on the L-shaped ribbed frame part 300 can be adjusted according to actual needs. That is, when only one first support rib 2011 is required for the L-shaped ribbed frame part 300, combined with Figure 2 and Figure 3As shown, it is only necessary to arrange two split female dies 101 at a first preset distance interval on the top surface of the blank 200, and then extrude the blank 200 to form two local side wall ribs 2012 and a first support rib 2011 located between the two local side wall ribs 2012 at the position where the blank 200 is close to the integral female die 100, jointly constituting the first preform 201. That is, when multiple first support ribs 2011 are required, in combination with Figure 4 and Figure 5 As shown, after the first preform 201 is formed, split female dies 101 can be continuously placed on the blank 200 at a first preset distance interval, and the local punch 102 is moved along the X-axis to extrude the blank 200 to form the second preform 202. Repeat the above steps until the final L-shaped ribbed frame part 300 is formed.

[0055] It can be understood that when forming multiple support ribs 2011, multiple split female dies 101 can be placed on the blank 200 at a first preset distance interval from one end to the other end of the blank 200 and then the local punch 102 is moved in the X-axis direction; or one or more split female dies 101 can be placed first, and then the local punch 102 is moved until it reaches below the outermost split female die 101 on the blank 200 where the first support rib 2011 has not been formed, and then the next one or more split female dies 101 are placed, and the process is repeated until the L-shaped ribbed frame part 300 is formed. The former has a faster forming efficiency when forming the L-shaped ribbed frame part 300 with a larger overall size, but requires a larger number of split female dies 101, while the latter does not require a large number of split female dies 101 to be produced, but the forming efficiency of the L-shaped ribbed frame part 300 is lower than that of the former. In this embodiment, no specific restrictions are imposed on the specific steps for forming multiple second support ribs 2012, and adjustments can be made according to the actual situation.

[0056] In addition, the first preset distance, the second preset distance, and the third preset distance in this embodiment can be adjusted according to the actual situation, corresponding to the thickness requirements of the first support rib 2011, the local side wall rib 2012, and the bottom plate 301 of the L-shaped ribbed frame part 300 after forming, and no specific restrictions are imposed in this embodiment.

[0057] In this embodiment, a progressive extrusion forming device for an L-shaped ribbed frame part is also provided. It processes the blank 200 by applying the above-mentioned forming method of the L-shaped ribbed frame part. The progressive extrusion forming device can be applied to the progressive extrusion forming of the L-shaped ribbed frame part 300 with a long strip or single-curved arc profile. The mold of the progressive extrusion forming device for the L-shaped ribbed frame part includes an integral female die 100, a split female die 101, and a local punch 102. The shape of the integral female die 100 is the same as the overall contour shape of the blank 200.

[0058] Specifically, when the progressive extrusion forming device is applicable to the progressive extrusion forming of the L-shaped ribbed frame part 300, the mold is moved a specified distance according to the forming requirements of the L-shaped ribbed frame part 300. Specifically, moving the mold means moving the split female die 101 for forming or the local male die 102 for applying pressure.

[0059] Specifically, the side wall of the integral female die 100 abuts against one side wall of the blank 200, and the top of the blank 200 is lower than the top of the integral female die 100; at least two split female dies 101 are placed at intervals along the X-axis direction on the top surface of the blank 200 at a first preset distance, and a gap with a second preset distance is left between the split female die 101 and the integral female die 100; the local male die 102 is placed below one end of the blank 200, and the top surface and one side wall of the local male die 102 abut against the bottom surface and the side wall of the integral female die 100 of the blank 200 respectively. The local male die 102 can move along the X-axis direction, and one of the split female die 101 and the local male die 102 can move along the Z-axis direction.

[0060] In the progressive extrusion forming device of the L-shaped ribbed frame part, by leaving a first preset distance between adjacent split female dies 101 and a gap with a second preset distance between the split female die 101 and the integral female die 100, part of the blank 200 is extruded into the gap during the extrusion process to form the required first support ribs 2011 and local side wall ribs 2012. Then, by moving the local male die 102 along the X-axis direction to extrude it, a plurality of first support ribs 2011 and local side wall ribs 2012 are sequentially formed to obtain the final required L-shaped ribbed frame part 300. The progressive extrusion forming device of the L-shaped ribbed frame part has a simple structure and is convenient to operate. By stepwise forging the overall forging of the blank 200 with a large overall size into multiple local extrusion formings, while forming ribs with a complex structure and a large overall size, the forming accuracy of the L-shaped ribbed frame part 300 is ensured.

[0061] Furthermore, the side wall of the split female die 101 close to the integral female die 100 is smoothly and transitionally connected to the two end faces of the split female die 101 respectively, so that the first support ribs 2011 and the local side wall ribs 2012 of the formed L-shaped ribbed frame part 300 can be smoothly transitioned, making the L-shaped ribbed frame part 300 more uniformly stressed and improving the overall stiffness and strength of the L-shaped ribbed frame part 300.

[0062] Among them, the length of the integral female die 100 is not less than the length of the blank 200 to ensure more accurate positioning of the integral female die 100 for the blank 200.

[0063] Optionally, the side wall of the split female die 101 away from the integral female die 100, the side wall of the blank 200 away from the integral female die 100, and the side wall of the local male die 102 away from the integral female die 100 are located in the same plane, so as to prevent the blank 200 from being extruded and causing part of the blank 200 to be extruded from the side wall away from the integral female die 100, reducing subsequent processing procedures and waste of the blank 200 material.

[0064] It can be understood that the progressive extrusion forming device for the L-shaped ribbed frame member further includes a device capable of positioning and moving the integral female die 100, the split female die 101, and the local male die 102. Since the relevant device belongs to the common general knowledge in the art, it will not be specifically described in this embodiment.

[0065] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A progressive extrusion forming method for an L-shaped ribbed frame member, characterized in that, It includes the following steps: S1: Apply pressure to a part of the blank (200) using a mold, extrude part of the metal of the blank (200) into the gap between the molds, and form a local rib structure; S2: Move the mold to the next part of the blank (200) to be formed; S3: Apply pressure to the part of the blank (200) to be formed using the mold, and form the subsequent local rib structure; Repeat steps S2 and S3 until all rib structures of the L-shaped ribbed frame part (300) are formed; The mold includes an integral female mold (100), a split female mold (101), and a local male mold (102). Step S1 specifically includes: Connect the blank (200) to the integral female mold (100), one side wall of the blank (200) abuts against the side wall of the integral female mold (100), and the top of the blank (200) is lower than the top of the integral female mold (100); Place at least two split female molds (101) on the top surface of the blank (200) at intervals along the X-axis direction at a first preset distance, and leave a gap with a second preset distance between the split female mold (101) and the integral female mold (100); Place the local male mold (102) below one end of the blank (200), and the top surface and one side wall of the local male mold (102) respectively abut against the bottom surface of the blank (200) and the side wall of the integral female mold (100); The local male mold (102) cooperates with the split female mold (101) to extrude the blank (200), so that parts of the blank (200) are respectively extruded between two adjacent split female molds (101) and into the gap, forming a preform with a first support rib (2011) and a local side wall rib (2012), and the first support rib (2011) and the local side wall rib (2012) are respectively parallel to the YZ plane and the XZ plane; The side wall of the split female mold (101) away from the integral female mold (100), the side wall of the blank (200) away from the integral female mold (100), and the side wall of the local male mold (102) away from the integral female mold (100) are located in the same plane.

2. The progressive extrusion forming method of the L-shaped ribbed frame part according to claim 1, characterized in that, In the step of the local male mold (102) cooperating with the split female mold (101) to extrude the blank (200), it includes: the integral female mold (100) and the split female mold (101) are fixed, and the local male mold (102) moves a third preset distance along the Z-axis direction towards the split female mold (101).

3. The progressive extrusion forming method of the L-shaped ribbed frame part according to claim 1, characterized in that, In the step of the local male mold (102) cooperating with the split female mold (101) to extrude the blank (200), it includes: the local male mold (102) is stationary, and the split female mold (101) moves a third preset distance along the Z-axis direction towards the integral female mold (100).

4. A progressive extrusion forming device for an L-shaped frame member, characterized in that, The progressive extrusion forming device can be applicable to the progressive extrusion forming of L-shaped ribbed frame parts (300) with long strip or single-curved arc profiles. The mold of the progressive extrusion forming device includes an integral female mold (100), a split female mold (101), and a local male mold (102), and the shape of the integral female mold (100) is the same as the overall contour shape of the blank (200); Specifically includes: Connect the blank (200) to the integral female die (100), with one side wall of the blank (200) abutting against the side wall of the integral female die (100), and the top of the blank (200) being lower than the top of the integral female die (100); Place at least two split female dies (101) on the top surface of the blank (200) at intervals along the X-axis direction by a first preset distance, and leave a gap with a second preset distance between the split female dies (101) and the integral female die (100); Place the local male die (102) below one end of the blank (200), with the top surface and one side wall of the local male die (102) abutting against the bottom surface of the blank (200) and the side wall of the integral female die (100) respectively; The local male die (102) cooperates with the split female dies (101) to extrude the blank (200), so that parts of the blank (200) are extruded between two adjacent split female dies (101) and into the gap respectively, forming a preform with a first support rib (2011) and a local side wall rib (2012), and the first support rib (2011) and the local side wall rib (2012) are parallel to the YZ plane and the XZ plane respectively; The side wall of the split female die (101) away from the integral female die (100), the side wall of the blank (200) away from the integral female die (100), and the side wall of the local male die (102) away from the integral female die (100) are located in the same plane.

5. The progressive extrusion forming device for the L-shaped frame member according to claim 4, characterized in that, When the progressive extrusion forming device is applicable to the progressive extrusion forming of the L-shaped ribbed frame part (300), move the die a third preset distance according to the forming requirements of the L-shaped ribbed frame part (300). Specifically, moving the die means moving the split female die (101) for forming or the local male die (102) for applying pressure.

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