Single-station hot forming device and method for multi-curvature arched guide arms

Abstract

The present invention relates to the technical field of automobile parts, and in particular to a single-station hot forming device for a multi-curvature bow guide arm, comprising: a left upper mold, a middle upper mold, a right upper mold, a lower mold and an auxiliary pad device. The left upper mold, the middle upper mold and the right upper mold are arranged in parallel, and the middle upper mold is arranged between the left upper mold and the right upper mold; the lower mold is arranged below the left upper mold, the middle upper mold and the right upper mold. The auxiliary pad device is installed on the lower mold, and the auxiliary pad device extends out to cooperate with the middle upper mold during the press forming process of the multi-curvature bow guide arm. The single-station hot forming device and method for the multi-curvature bow guide arm provided by the present invention can realize the hot forming processing of the multi-curvature bow guide arm through two pressing processes, and ensure that the processed multi-curvature bow guide arm meets the design requirements.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a single-station hot forming device and method for a multi-curvature bow-shaped guide arm. Background Art

[0002] The application of air suspension for single-arm trailers is becoming more and more common, and the guide arm is a key component. The multi-curvature bow-shaped guide arm is a guide arm suitable for lightweighting. The multi-curvature bow-shaped guide arm is a product developed based on the lightweighting of the entire vehicle. Compared with the conventional Z-type guide arm, the suspension system is lightweighted and reduced by 15% to 20%, and other performance indicators are basically the same. The industrialization prospect is very good.

[0003] At the current development and trial stage, it is not economically viable to invest a large amount of money to develop special forming equipment. Since the appearance of the modified product belongs to a multi-curvature inflection point workpiece, and the middle of the workpiece and the axle clamping part adopts a V-shaped positioning clamping structure. Therefore, the use of existing conventional Z-type guide arm single-station hot forming equipment for forming has the following problems: Due to the processing and assembly errors of the mold and the processing errors of the workpiece section thickness, it is impossible to uniformly force the multi-curvature during hot forming, and it is impossible to ensure that the multi-curvature appearance is consistent with the design state. Summary of the invention

[0004] The present invention aims to solve the technical problem in the prior art that, when using the existing conventional Z-shaped guide arm single-station hot forming equipment for forming, due to the processing and assembly errors of the mold and the processing errors of the cross-sectional thickness of the workpiece, it is impossible to evenly apply force to multiple curvatures during hot forming, and it is impossible to ensure that the multiple curvature shapes are consistent with the designed state. The present invention provides a single-station hot forming device and method for a multi-curvature bow guide arm.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A single-station hot forming tool for a multi-curvature bow-shaped guide arm, comprising: a left upper die, a middle upper die, a right upper die, a lower die and an auxiliary pad device;

[0007] The left upper mold, the middle upper mold and the right upper mold are arranged in parallel, and the middle upper mold is arranged between the left upper mold and the right upper mold;

[0008] The lower mold is arranged below the left upper mold, the middle upper mold and the right upper mold;

[0009] The auxiliary pad device is installed on the lower die, and the auxiliary pad device extends out to cooperate with the middle upper die during the press forming process of the multi-curvature bow-shaped guide arm.

[0010] Further: the auxiliary pad device includes: a first cylinder assembly, a second cylinder assembly and a mounting seat assembly;

[0011] The mounting seat assembly is connected to one side in the middle of the lower mold; the first cylinder assembly and the second cylinder assembly are movably connected to the mounting seat assembly respectively; the first cylinder assembly and the second cylinder assembly extend out to cooperate with the middle upper mold during the press forming process of the multi-curvature bow-shaped guide arm.

[0012] Further: the first cylinder assembly includes: a first cylinder base, a first slide rail, a first slider, a first cylinder, a first pad, a first cylinder front connecting seat and a first cylinder rear connecting seat;

[0013] A first connecting block is disposed at the lower end of the first cylinder base, and the first connecting block is movably connected to the lower mold;

[0014] The first slide rail is arranged on the first cylinder base, and the first slider is arranged on the first slide rail; the front end of the first cylinder is installed on the first slider through the first cylinder front connecting seat, and the rear end of the first cylinder is installed on the first cylinder base through the first cylinder rear connecting seat; the first pad is fixedly connected to the first cylinder front connecting seat, and the first pad is extended to cooperate with the middle upper mold during the press forming process of the multi-curvature bow guide arm.

[0015] Further: the second cylinder assembly includes: a second cylinder base, a second slide rail, a second slider, a second cylinder, a second pad, a second cylinder front connecting seat and a second cylinder rear connecting seat;

[0016] A second connecting block is disposed at the lower end of the second cylinder base, and the second connecting block is movably connected to the lower mold;

[0017] The second slide rail is arranged on the second cylinder base, and the second slider is arranged on the second slide rail; the front end of the second cylinder is installed on the second slider through the second cylinder front connecting seat, and the rear end of the second cylinder is installed on the second cylinder base through the second cylinder rear connecting seat; the second pad is fixedly connected to the second cylinder front connecting seat, and the second pad is extended to cooperate with the middle upper mold during the press forming process of the multi-curvature bow guide arm.

[0018] Further: the mounting seat assembly includes: a base, a third slide rail, a third slider, a fourth slide rail, a fourth slider, a first spring and a second spring;

[0019] The outer side surface of the base is provided with a first slide groove and a second slide groove, and the first slide groove and the second slide groove are arranged in a V shape; the third slide rail is arranged in parallel in the first slide groove, the third slider is arranged on the third slide rail, and the third slider is connected to the first connecting block; the fourth slide rail is arranged in parallel in the second slide groove, the fourth slider is arranged on the fourth slide rail, and the fourth slider is connected to the second connecting block;

[0020] The first spring is arranged on the outside of the first slide groove, one end of the first spring is connected to the base, and the other end of the first spring abuts against the lower end of the base; the second spring is arranged on the outside of the second slide groove, one end of the second spring is connected to the base, and the other end of the second spring abuts against the lower end of the base.

[0021] The present invention also provides a single-station thermoforming method for a multi-curvature arched guide arm, comprising:

[0022] The workpiece is placed on a single-station hot forming tooling with a multi-curvature bow-shaped guide arm, and the workpiece is pressed for the first time using the same method as the ordinary Z-shaped guide arm press-bending forming process;

[0023] During the first forming process of the workpiece, the first pressure is applied to the air spring mounting surface at the rear end of the workpiece and the pressure is maintained for the first time to ensure the bending depth and flatness accuracy of the rear end;

[0024] Control the pad on the auxiliary pad device to automatically extend to press the workpiece for the second time;

[0025] Apply a second pressure to the V-shaped clamping part and maintain the pressure for a second time to ensure the flatness and angle accuracy of the V-shaped clamping part;

[0026] After the second pressing is completed, the auxiliary pad device is controlled to reset.

[0027] Furthermore: the first pressure is 1000-1200 KN, the first time is 2-3 seconds, the second pressure is 1000-1200 KN, and the second time is 2 seconds.

[0028] The single-station thermoforming device and method for the multi-curvature arched guide arm provided by the present invention have at least the following beneficial effects or advantages:

[0029] The single-station hot forming device and method for a multi-curvature bow guide arm provided by the present invention are provided with an auxiliary pad device on the basis of conventional single-station hot forming equipment for a Z-type guide arm; in the forming process of the multi-curvature bow guide arm, two pressing processes are implemented, wherein the first pressing process adopts the traditional pressing method of the Z-type guide arm to ensure the bending depth and flatness accuracy of the rear end of the workpiece; in the second pressing process, the auxiliary pad device is extended, and the middle upper mold presses the workpiece through the auxiliary pad device to ensure the flatness and angle accuracy of the V-shaped clamping part; through the two pressing processes, the hot forming processing of the multi-curvature bow guide arm can be realized, and it is ensured that the processed multi-curvature bow guide arm meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a single-station thermoforming device for a multi-curvature arched guide arm provided in an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of the lower mold structure provided by an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the structure of an auxiliary pad device provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the structure of a first cylinder assembly provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic structural diagram of the mounting base assembly provided by the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0036] 1-left upper die, 2-middle upper die, 3-right upper die, 4-lower die, 5-auxiliary pad device, 51-first cylinder assembly, 511-first cylinder base, 512-first slide rail, 513-first slider, 514-first cylinder, 515-first pad, 516-first cylinder front connecting seat, 517-first cylinder rear connecting seat, 518-first connecting block, 52-second cylinder assembly, 53-mounting seat assembly, 531-base, 532-first slide groove, 533-second slide groove, 534-third slide rail, 535-third slider, 536-first spring, 537-fourth slider, 538-fourth slide rail, 539-second spring, 6-workpiece. DETAILED DESCRIPTION

[0037] The present invention aims to solve the technical problem in the prior art that, when using the existing conventional Z-shaped guide arm single-station hot forming equipment for forming, due to the processing and assembly errors of the mold and the processing errors of the cross-sectional thickness of the workpiece, it is impossible to evenly apply force to multiple curvatures during hot forming, and it is impossible to ensure that the multiple curvature shapes are consistent with the designed state. The present invention provides a single-station hot forming device and method for a multi-curvature bow guide arm.

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The embodiment of the present invention provides a single-station hot forming tool for a multi-curvature arched guide arm, such as Figure 1-Figure 5 , including: a left upper die 1, a middle upper die 2, a right upper die 3, a lower die 4 and an auxiliary pad device 5. The left upper die 1, the middle upper die 2 and the right upper die 3 are arranged in parallel, and the middle upper die 2 is arranged between the left upper die 1 and the right upper die 3; the left upper die 1 and the right upper die 3 are connected to a unified oil cylinder and driven by the same oil cylinder, and the middle upper die 2 is connected to a connecting oil cylinder separately and driven separately by the oil cylinder. The lower die 4 is arranged below the left upper die 1, the middle upper die 2 and the right upper die 3, and the workpiece 6 is arranged on the lower die 4 which remains stationary, and the oil cylinder drives the left upper die 1, the middle upper die 2 and the right upper die 3 to move downward to press the workpiece 6. The auxiliary pad device 5 is installed on the lower die 4, and the auxiliary pad device 5 can be extended to cooperate with the middle upper die 2 during the process of pressing and forming the multi-curvature bow guide arm, and the middle upper die 2 presses the workpiece 6 through the auxiliary pad device 5, and the auxiliary pad device 5 is reset after the pressing is completed.

[0040] Specifically, Figure 1 , Figure 3 , Figure 4 and Figure 5 The auxiliary pad device 5 includes: a first cylinder assembly 51, a second cylinder assembly 52 and a mounting seat assembly 53. The mounting seat assembly 53 is connected to one side in the middle of the lower mold 4; the first cylinder assembly 51 and the second cylinder assembly 52 are movably connected to the mounting seat assembly 53 respectively; the first cylinder assembly 51 and the second cylinder assembly 52 extend out to cooperate with the middle upper mold 2 during the process of pressing and forming the multi-curvature bow-shaped guide arm.

[0041] like Figure 3 and Figure 4The first cylinder assembly 51 includes: a first cylinder base 511, a first slide rail 512, a first slider 513, a first cylinder 514, a first pad 515, a first cylinder front connection seat 516 and a first cylinder rear connection seat 517. A first connection block 518 is provided at the lower end of the first cylinder base 511, and the first connection block 518 is movably connected to the lower mold 4. The first slide rail 512 is provided on the first cylinder base 511, and the first slider 513 is provided on the first slide rail 512; the front end of the first cylinder 514 is mounted on the first slider 513 through the first cylinder front connection seat 516, and the rear end of the first cylinder 514 is mounted on the first cylinder base 511 through the first cylinder rear connection seat 517; the first pad 515 is fixedly connected to the first cylinder front connection seat 516, and the first pad 515 is extended to cooperate with the middle upper mold 2 during the process of pressing and forming the multi-curvature bow guide arm.

[0042] The second cylinder assembly 52 has the same structure as the first cylinder assembly 51. Specifically, the second cylinder assembly 52 includes: a second cylinder base, a second slide rail, a second slider, a second cylinder, a second pad, a second cylinder front connection seat, and a second cylinder rear connection seat. A second connection block is provided at the lower end of the second cylinder base, and the second connection block is movably connected to the lower mold 4. The second slide rail is provided on the second cylinder base, and the second slider is provided on the second slide rail; the front end of the second cylinder is mounted on the second slider through the second cylinder front connection seat, and the rear end of the second cylinder is mounted on the second cylinder base through the second cylinder rear connection seat; the second pad is fixedly connected to the second cylinder front connection seat, and the second pad is extended to cooperate with the middle upper mold 2 during the process of pressing and forming the multi-curvature bow guide arm.

[0043] like Figure 5 The mounting seat assembly 53 includes: a base 531, a third slide rail 534, a third slider 535, a fourth slide rail 538, a fourth slider 537, a first spring 536 and a second spring 539. The outer side of the base 531 is provided with a first slide groove 532 and a second slide groove 533, and the first slide groove 532 and the second slide groove 533 are arranged in a V shape; the third slide rail 534 is arranged in parallel in the first slide groove 532, the third slider 535 is arranged on the third slide rail 534, and the third slider 535 is connected to the first connecting block 518; the fourth slide rail 538 is arranged in parallel in the second slide groove 533, the fourth slider 537 is arranged on the fourth slide rail 538, and the fourth slider 537 is connected to the second connecting block. The first spring 536 is arranged on the outside of the first slide groove 532, one end of the first spring 536 is connected to the base 531, and the other end of the first spring 536 abuts against the lower end of the base 531; the second spring 539 is arranged on the outside of the second slide groove 533, one end of the second spring 539 is connected to the base 531, and the other end of the second spring 539 abuts against the lower end of the base 531.

[0044] Embodiment 2

[0045] like Figure 1-Figure 5 The embodiment of the present invention further provides a single-station thermoforming method for a multi-curvature arched guide arm, comprising:

[0046] Step S10. Set the workpiece 6 on a single-station hot forming tooling with a multi-curvature bow-shaped guide arm, and use a common Z-type guide arm press-bending forming process. Specifically, after the equipment (i.e., tooling) is installed, adjust the cylinder stroke, longitudinal positioning, and lateral positioning in the manual adjustment state of the equipment. Switch the equipment to automatic state, and the equipment enters automatic pressing and forming mode. Pressing process: The robot places the hot blank into the set position of the lower mold 4; the longitudinal push cylinder and the lateral push cylinder push the workpiece 6 to a precise position; the cylinder of the middle upper mold 2 moves downward to press the workpiece 6; the left and right upper molds move downward to press the workpiece 6; after pressing is completed, all cylinders return to their original positions, and the robot takes the material for quenching. The upper mold equipment is set to automatically press the workpiece 6 for the first time in the same way.

[0047] Step S20. During the first forming process of the workpiece 6, a first pressure is applied to the air spring mounting surface at the rear end of the workpiece 6 and the pressure is maintained for a first time to ensure the bending depth and flatness accuracy of the rear end (bending depth accuracy requires ±3mm, flatness accuracy 1mm). The rear end of the workpiece is the air spring mounting surface, and the bending depth and flatness indicators are assembly dimensions, and the accuracy requirements are also high. This part needs to apply a certain force and maintain pressure for a certain time to ensure dimensional accuracy.

[0048] Step S30: Control the pad on the auxiliary pad device 5 to automatically extend, and perform a second pressing on the workpiece 6. During the second pressing process, the upper middle die presses the V-shaped clamping part of the workpiece 6 through the pad of the auxiliary pad device 5.

[0049] Step S30. Apply a second pressure to the V-shaped clamping part and maintain the pressure for a second time to ensure the flatness and angle accuracy of the V-shaped clamping part (flatness accuracy 1mm, angle accuracy ±1°). The V-shaped clamping part of the workpiece is a key part of the workpiece, and the flatness and angle dimensional accuracy requirements are high. This part needs to apply a certain force and maintain the pressure for a certain time to ensure the dimensional accuracy.

[0050] Step S40: After the second pressing is completed, the auxiliary pad device 5 is controlled to reset.

[0051] Furthermore: the first pressure is 1000-1200 KN, the first time is 2-3 seconds, the second pressure is 1000-1200 KN, and the second time is 2 seconds.

[0052] The single-station thermoforming device and method for the multi-curvature arched guide arm provided by the embodiment of the present invention have at least the following beneficial effects or advantages:

[0053] The single-station hot forming device and method for a multi-curvature bow guide arm provided in an embodiment of the present invention are provided with an auxiliary pad device on the basis of a conventional single-station hot forming equipment for a Z-type guide arm; in the forming process of the multi-curvature bow guide arm, two pressing processes are implemented, wherein the first pressing process adopts a traditional pressing method for a Z-type guide arm to ensure the bending depth and flatness accuracy of the rear end of the workpiece; in the second pressing process, the auxiliary pad device is extended, and the middle upper mold presses the workpiece through the auxiliary pad device to ensure the flatness and angle accuracy of the V-shaped clamping part; through two pressing processes, the hot forming processing of the multi-curvature bow guide arm can be realized, ensuring that the processed multi-curvature bow guide arm meets the design requirements.

[0054] In the description of the present invention, it should be noted that the terminology nouns in the various embodiments, such as "up", "down", "front", "back", "left", "right", etc., which indicate directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the referred elements and devices must be operated according to the specific directions and defined operations and methods and structures in the specification. Such directional nouns do not constitute a limitation on the present invention.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-station thermoforming tool for a multi-curvature bow-shaped guide arm, characterized in that: include: Left upper die, middle upper die, right upper die, lower die and auxiliary pad device; The left upper mold, the middle upper mold and the right upper mold are arranged in parallel, and the middle upper mold is arranged between the left upper mold and the right upper mold; The lower mold is arranged below the left upper mold, the middle upper mold and the right upper mold; The auxiliary pad device is installed on the lower die, and the auxiliary pad device extends out to cooperate with the middle upper die during the process of press-forming the multi-curvature bow-shaped guide arm; The auxiliary pad device comprises: a first cylinder assembly, a second cylinder assembly and a mounting seat assembly; The mounting seat assembly is connected to one side in the middle of the lower die; the first cylinder assembly and the second cylinder assembly are movably connected to the mounting seat assembly respectively; the first cylinder assembly and the second cylinder assembly extend out to cooperate with the middle upper die during the process of pressing and forming the multi-curvature bow-shaped guide arm; The first cylinder assembly includes: a first cylinder base, a first slide rail, a first slider, a first cylinder, a first pad, a first cylinder front connecting seat and a first cylinder rear connecting seat; A first connecting block is disposed at the lower end of the first cylinder base, and the first connecting block is movably connected to the lower mold; The first slide rail is arranged on the first cylinder base, and the first slider is arranged on the first slide rail; the front end of the first cylinder is installed on the first slider through the first cylinder front connecting seat, and the rear end of the first cylinder is installed on the first cylinder base through the first cylinder rear connecting seat; the first pad is fixedly connected to the first cylinder front connecting seat, and the first pad is extended to cooperate with the middle upper mold during the press forming process of the multi-curvature bow guide arm.

2. The single-station thermoforming tooling for the multi-curvature arched guide arm according to claim 1, characterized in that: The second cylinder assembly includes: a second cylinder base, a second slide rail, a second slider, a second cylinder, a second pad, a second cylinder front connecting seat and a second cylinder rear connecting seat; A second connecting block is disposed at the lower end of the second cylinder base, and the second connecting block is movably connected to the lower mold; The second slide rail is arranged on the second cylinder base, and the second slider is arranged on the second slide rail; the front end of the second cylinder is installed on the second slider through the second cylinder front connecting seat, and the rear end of the second cylinder is installed on the second cylinder base through the second cylinder rear connecting seat; the second pad is fixedly connected to the second cylinder front connecting seat, and the second pad is extended to cooperate with the middle upper mold during the press forming process of the multi-curvature bow guide arm.

3. The single-station thermoforming tooling for the multi-curvature arched guide arm according to claim 2, characterized in that: The mounting seat assembly comprises: a base, a third slide rail, a third slider, a fourth slide rail, a fourth slider, a first spring and a second spring; The outer side surface of the base is provided with a first slide groove and a second slide groove, and the first slide groove and the second slide groove are distributed in a V shape; the third slide rail is arranged in parallel in the first slide groove, the third slider is arranged on the third slide rail, and the third slider is connected to the first connecting block; the fourth slide rail is arranged in parallel in the second slide groove, the fourth slider is arranged on the fourth slide rail, and the fourth slider is connected to the second connecting block; The first spring is arranged on the outside of the first slide groove, one end of the first spring is connected to the base, and the other end of the first spring abuts against the lower end of the base; the second spring is arranged on the outside of the second slide groove, one end of the second spring is connected to the base, and the other end of the second spring abuts against the lower end of the base.

4. A single-station hot forming method for a multi-curvature arched guide arm, the method being implemented based on the single-station hot forming tooling for a multi-curvature arched guide arm according to claim 1, characterized in that: include: The workpiece is placed on a single-station hot forming tooling with a multi-curvature bow-shaped guide arm, and the workpiece is pressed for the first time using the same method as the ordinary Z-shaped guide arm press-bending forming process; During the first forming process of the workpiece, the first pressure is applied to the air spring mounting surface at the rear end of the workpiece and the pressure is maintained for the first time to ensure the bending depth and flatness accuracy of the rear end; Control the pad on the auxiliary pad device to automatically extend to press the workpiece for the second time; Apply a second pressure to the V-shaped clamping part and maintain the pressure for a second time to ensure the flatness and angle accuracy of the V-shaped clamping part; After the second pressing is completed, the auxiliary pad device is controlled to reset.

5. The single-station thermoforming method for a multi-curvature arched guide arm according to claim 4, characterized in that: The first pressure is 1000-1200 KN, the first time is 2-3 seconds, the second pressure is 1000-1200 KN, and the second time is 2 seconds.

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