One-time forming two-in-one bending die for automobile U-shaped cantilever and process method

Abstract

The invention relates to a one-time forming two-in-one bending die for an automobile U-shaped cantilever and a process method, and the one-time forming two-in-one bending die comprises an upper die, a lower die, a lower die and an upper die, the bottom of the upper die is provided with a U-shaped piece matched with the shape of the U-shaped cantilever; the T-shaped punch comprises a transverse mounting part and a vertical punching part, the mounting part is located above the upper die, and the punching part is movably arranged in the U-shaped cavity in a penetrating mode; a U-shaped cavity matched with the U-shaped piece is formed in the inner side of the lower die, and a storage groove matched with the stamping part is formed below the U-shaped cavity. Primary bending is completed through the upper die and the lower die, secondary bending is completed through relative stretching of the punches, two-time bending is completed at a time through one die, secondary carrying and secondary bending stations of a mechanical arm are omitted, beats are reduced, and therefore the productivity is improved, the depth of a coarse grain ring is reduced, and the net weight of the die is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile chassis lightweight forging forming technology, and particularly relates to a one-time forming two-in-one press bending die and process method for an automobile U-shaped cantilever. BACKGROUND

[0002] At present, the existing process route for the automobile U-shaped cantilever is: roll forging -> one-time press bending -> two-time press bending -> temperature compensation -> pre-forging -> final forging.

[0003] The main disadvantages are as follows: a) Tact time loss: the mechanical hand needs to be transported after the first press bending, including positioning, response and pressure maintaining, which takes 10 s; the original 80 pieces / h (45 s / piece) becomes a bottleneck.

[0004] b) Coarse grain ring: the temperature of the blank before the second press bending decreases from the initial 480 DEG C to 420 DEG C, and a 1.25 mm coarse grain ring is generated on the surface layer of the aluminum alloy, which causes the coarse grain ring of the final formed forging to reach 3 mm, and the fatigue life to be reduced by more than 15 %.

[0005] c) Equipment redundancy: the second press bending die weighs 745 kg, which increases the 315 t press machine slide inertia and the peak current of the servo motor. SUMMARY Based on the above description, the present application provides a one-time forming two-in-one press bending die and process method for an automobile U-shaped cantilever, to solve the problems of tact time loss, coarse grain ring formation and equipment redundancy in the related art.

[0006] The technical scheme for solving the above technical problems is as follows: a one-time forming two-in-one press bending die for an automobile U-shaped cantilever, comprising: an upper die provided with a U-shaped piece at the bottom, which matches the shape of the U-shaped cantilever; a T-shaped punch comprising a horizontal mounting portion and a vertical punching portion, the mounting portion being located above the upper die, and the punching portion being movably arranged in the U-shaped piece; a lower die provided with a U-shaped cavity inside, which matches the U-shaped piece, and a storage groove below the U-shaped cavity, which matches the punching portion.

[0007] On the basis of the above technical scheme, the present application can also be improved as follows.

[0008] Further, the bottom of the mounting portion is connected to the top of the upper die through a spring.

[0009] Further, the lower end of the punching portion is arc-shaped.

[0010] In a second aspect, the embodiment of the present application also provides a process method using the one-time forming two-in-one bending die for the automobile U-shaped cantilever, comprising the following steps: placing the blank after roll forging into the lower die; driving the upper die to go down by the press machine, completing the primary bending; closing the upper and lower dies, driving the punch to continue to go down and extending the U-shaped part, completing the secondary bending; resetting the upper and lower dies and the punch, and sending the formed part to the next station.

[0011] Further, in the step of completing the primary bending, the deformation force of the blank is less than the spring pre-tightening force, and the spring is not compressed.

[0012] Further, in the step of completing the secondary bending, the spring is compressed.

[0013] Further, in the step of resetting the punch, the spring drives the punch to reset.

[0014] Further, the maximum compression amount of the spring is 60 mm, and the safety factor is 1.5-2.0.

[0015] Further, in the step of completing the secondary bending, the blank metal flows into the storage tank downward, realizing local shape compensation.

[0016] Further, the press machine is a 315 t servo press machine, the sliding block speed is 150 mm / s, and the lower dead point accuracy is ±0.05 mm.

[0017] Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects: By first using the upper and lower dies to complete the primary bending, and then using the punch to extend relatively to complete the secondary bending, the two-time bending is completed by one set of die at one time, the secondary handling by the mechanical hand and the secondary bending station are cancelled, the cycle time is reduced, the production capacity is improved, the coarse grain ring depth is reduced, and the net weight of the die is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall structure schematic diagram of the one-time forming two-in-one bending die for the automobile U-shaped cantilever is provided for the embodiment of the present application; Figure 2 The structure schematic diagram of the upper die is provided for the embodiment of the present application; Figure 3 The structure schematic diagram of the lower die is provided for the embodiment of the present application.

[0019] In the drawings, the component list represented by each reference numeral is as follows: 1, upper die; 11, U-shaped part; 2, punch; 21, mounting part; 22, stamping part; 3, lower die; 31, U-shaped cavity; 32, storage tank; 4, spring. DETAILED DESCRIPTION

[0020] For the purpose of facilitating the understanding of the present application, a more comprehensive description of the present application will be given below with reference to the relevant drawings. The drawings show embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided for the purpose of making the disclosure of the present application more thorough and comprehensive.

[0021] The embodiment of the present application provides a one-time forming two-in-one press-bending die process method for a U-shaped suspension arm of an automobile, which can solve the problems of beat loss, coarse crystal ring formation and equipment redundancy in the prior art, and is suitable for a servo press machine or an oil press machine production line.

[0022] Referring to Figure 1 As shown in the figure, the one-time forming two-in-one press-bending die provided by the embodiment of the present application for the U-shaped suspension arm of the automobile comprises: an upper die 1, which is provided with a U-shaped part 11 matching the shape of the U-shaped suspension arm; a T-shaped punch 2, which comprises a horizontal mounting part 21 and a vertical punching part 22, the mounting part 21 is located above the upper die 1, and the punching part 22 is movably arranged in the U-shaped part 11, the punch 2 is floating, corresponding to the secondary press-bending area, is hollowed out by the upper die 1 and inlaid; a lower die 3, which is provided with a U-shaped cavity 31 matching the U-shaped part 11 on the inner side, and a storage groove 32 matching the punching part 22 is arranged below the U-shaped cavity 31, and the storage groove 32 is in communication with the U-shaped part 11. The upper and lower dies are used to complete the primary press-bending, and then the punch is used to complete the secondary press-bending, so that the two press-bendings are completed by one set of dies at one time, the secondary handling by the mechanical hand and the secondary press-bending station are cancelled, the beat is reduced, the production capacity is improved, the coarse crystal ring depth is reduced, and the net weight of the die is reduced.

[0023] Specifically, the embodiment of the present application uses one set of dies to complete the primary press-bending and the secondary press-bending at one time in a 315t servo press machine, the beat is reduced from 45s / piece to 35s / piece, the production capacity is improved from 80 pieces / hour to 102 pieces / hour, the coarse crystal ring depth is less than or equal to 0.5mm, and the net weight of the die is reduced by more than 300kg.

[0024] Further, the bottom of the mounting part 21 is connected to the top of the upper die 1 through a spring 4, the spring 4 is a high-temperature-resistant flat wire spring, supports the upper floating of the punch 2 during the first pressing, and drives the punch 2 to reset after the second pressing.

[0025] Preferably, the lower end of the punching part 22 is arc-shaped, which matches the shape of the U-shaped suspension arm, facilitating the pressing.

[0026] The one-time forming process method for the U-shaped suspension arm of the automobile provided by the embodiment of the present application comprises the following steps: S1 placing the blank after roll forging into the lower die 3; S2, the upper die 1 is driven downward by a press to complete the first bending; S3, the upper and lower dies are closed, the punch 2 is continuously driven downward and the U-shaped piece 11 is extended to complete the second bending; S4, the upper and lower dies and the punch 2 are reset, and the formed piece is sent to the next station. In step S1, the aluminum alloy blank after roll forging is directly put into the mold at a temperature of 480-500 ℃.

[0027] In step S2, the slider is driven downward, and the upper die is self-weighted to complete the first bending. At this time, the blank deformation force is less than the spring 4 pre-tightening force of 30-50 kN, and the spring 4 is not compressed.

[0028] In step S3, the upper and lower dies are closed, and the slider is continuously driven downward by 30-50 mm (the spring still has a compression amount to guarantee the service life of the spring 4). At this time, the spring 4 pre-tightening force is 70-100 kN, and the punch 2 is extended to complete the second bending. The metal flows into the storage groove 32 to realize local shape compensation.

[0029] In step S4, the slider is returned, the spring is reset, and the manipulator sends the first formed piece to the preforming station.

[0030] The key parameters are as follows: Equipment type: servo press, oil press.

[0031] The maximum compression amount of the spring 4 is 60 mm, and the safety factor is 1.5-2.0.

[0032] The beneficial effects include: cycle time: 35 s / piece, production capacity +27.5 %; quality: coarse grain ring depth reduction ≥85 %; energy consumption: 315 t servo motor peak current reduction 8 %; automation: canceling the second bending station, the manipulator path is shortened by 1200 mm; universality: the mold interface is compatible with the standard mold clamping device of the 315 t servo press, and aluminum alloy / steel materials can be shared by only changing the spring pre-tightening force parameters.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0034] It will be understood that the spatially relative terms "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can also be oriented in the other direction, and the spatially relative terms used herein are intended to encompass such additional orientations. It is to be understood that the spatially relative terms used herein, including up, down, front, back, right, left, and the like, are intended to be interpreted as

[0035] It has to be noted that, when referring to terms such as "connected to", it is meant that a connection can be either direct or through intervening elements. "Connected" in the following embodiments should be understood as "electrically connected", "communicatively connected", etc. if the circuits, modules, units, etc. connected to each other have transmission of electrical signals or data.

[0036] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", or the like, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

[0037] The above description is only preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A one-piece forming and bending die for automotive U-shaped cantilever, characterized in that, It includes: The upper mold (1) has a U-shaped part (11) at the bottom that matches the shape of the U-shaped cantilever. The T-shaped punch (2) includes a horizontal mounting part (21) and a vertical stamping part (22). The mounting part (21) is located above the upper mold (1), and the stamping part (22) is movably inserted into the U-shaped part (11). The lower mold (3) has a U-shaped cavity (31) on its inner side that matches the U-shaped part (11), and a storage groove (32) that matches the stamping part (22) is provided below the U-shaped cavity (31).

2. The one-piece forming and bending die for automotive U-shaped cantilever as described in claim 1, characterized in that: The bottom of the mounting part (21) is connected to the top of the upper mold (1) by a spring (4).

3. The one-piece forming and bending die for automotive U-shaped cantilever as described in claim 1, characterized in that: The lower end of the stamping part (22) is arc-shaped.

4. A process method using the one-time forming two-in-one bending die for automotive U-shaped cantilever as described in claim 1, characterized in that, Includes the following steps: Place the forged billet into the lower die (3); The upper mold (1) is driven downward by a press to complete the initial bending. The upper and lower dies are closed, and the driving punch (2) continues to descend and extends the U-shaped part (11) to complete the secondary bending; Reset the upper and lower dies and punch (2), and send the formed part to the next station.

5. The process method according to claim 4, characterized in that: In the initial bending step, the deformation force of the billet is less than the preload of the spring (4), and the spring (4) is not compressed.

6. The process method according to claim 5, characterized in that: During the second bending step, the spring (4) is compressed.

7. The process method according to claim 5, characterized in that: In the step of resetting the punch (2), the spring (4) drives the punch (2) to reset.

8. The process method according to claim 5, characterized in that: The maximum compression of the spring (4) is 60 mm, and the safety factor is 1.5~2.

0.

9. The process method according to claim 4, characterized in that: In the second bending step, the billet metal flows downward into the storage tank (32) to achieve local shape compensation.

10. The process method according to claim 4, characterized in that: The press is a 315 t servo press with a slide speed of 150 mm / s and a bottom dead center accuracy of ±0.05 mm.

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