Forging method and device of front shock absorber lower fork arm for automobile air suspension

Abstract

The invention discloses a method for forging a lower fork arm of a front shock absorber for an automobile air suspension, which comprises the following steps of: carrying out roll forging on an initial blank by adopting a roll forging machine to obtain a roll forging blank; pre-forging to obtain a pre-forged blank; reheating to the temperature of 480 to 520 DEG C; a die forging machine is adopted for conducting finish forging on the prefabricated blank, and a finish forging blank is obtained; sequentially carrying out water cooling, corrosive washing, acid pickling and shot blasting treatment on the final forging blank to obtain a forging with work hardening and residual stress on the surface; wherein in the pre-forging process and the finish-forging process, the temperature of a pre-forging die is the same as that of a finish-forging blank; the invention further discloses a device for forging the lower fork arm of the front shock absorber for the automobile air suspension. According to the invention, the automatic adjustment of the height and the angle during reciprocating heating and multi-stage forging of the blank among the roll forging machine, the pre-forging die, the heating furnace and the finish forging die is realized, the operation steps of multi-time isothermal forging are simplified, the operation steps are simple, and the metal flowability during forging and the simplicity of the forging steps are both considered.

Description

Technical Field

[0001] The invention relates to the technical field of forging, and in particular to a forging method and device for a lower wishbone of a front shock absorber for an automobile air suspension. Background Art

[0002] The lower wishbone of the front shock absorber on the new energy vehicle connects the air suspension and the chassis through both ends. Its upper end is connected to the air suspension, and the lower double wishbone is connected to the chassis through a combination of two ball joints, which can greatly increase the activity space of the suspension and obtain a more ideal suspension performance (see the attached figure of the manual for the specific shape). Figure 2 and Figure 3 ). At the same time, the use of aluminum alloy can effectively improve the strength of the overall structure, but can minimize the weight of the chassis structure to achieve the purpose of lightweight.

[0003] In the prior art, a casting process is generally used for production. However, since the front shock absorber lower fork arm is a relatively complex and lightweight structure, the forging process is complicated, and the cast front shock absorber lower fork arm has low material utilization, many sand holes and pores, coarse grains, discontinuous metal fibers, inferior mechanical properties to forgings, and poor product fatigue resistance. At the same time, the fatigue resistance and tensile strength of the tension spring swing arm manufactured by this method cannot meet the requirements.

[0004] The lower wishbone of the front shock absorber on new energy vehicles is a relatively complex structure. It not only needs to improve the precision during forging, but also its two arms are relatively slender and need to have sufficient strength after forming. For this reason, compared with the traditional casting process, the aluminum alloy forging forming method can be further adopted to effectively improve the radial strength of the forging. However, the die forging process that relies on the plastic flow of metal to fill the mold cavity is much worse than the flow of liquid metal during casting due to the fluidity of the metal. Therefore, if the die forging method is used to produce parts with complex shapes and structures, its forming is more difficult than casting.

[0005] In order to improve the fluidity of liquid metal during casting, distributed processing and multiple forging methods can be used. However, this method requires multiple removal and insertion actions, which is more complicated to handle, resulting in cumbersome steps, time-consuming and labor-intensive casting of precision castings. Summary of the invention

[0006] The object of the present invention is to provide a forging method and device for a lower wishbone of a front shock absorber for an automobile air suspension, so as to solve the technical problem in the prior art that metal fluidity and simplicity of forging steps cannot be taken into account at the same time during forging.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0008] The present invention provides a forging method for a lower wishbone of a front shock absorber for an automobile air suspension, comprising the following steps:

[0009] The initial blank is heated to 480-520° C., kept at this temperature for 1-2 hours, and roll-forged by a roll forging machine to obtain a roll-forged blank;

[0010] Using a transfer assembly to clamp the roll forging blank and place it horizontally into a pre-forging die, releasing it, and using a die forging machine to pre-forge the roll forging blank to obtain a pre-forged blank;

[0011] Use a transfer assembly to put the preforged billet downward into a heating furnace, reheat it to 480-520° C., and keep it at 480-520° C. for 1-2 hours to obtain a prefabricated billet. The temperature of the prefabricated billet when it is taken out of the furnace must be ≥480° C.

[0012] Using a transfer assembly to clamp the prefabricated blank horizontally and place it in a final forging die, releasing it, and performing final forging on the prefabricated blank using a die forging machine to obtain a final forging blank;

[0013] The final forging blank is subjected to water cooling, etching, pickling and shot blasting in sequence to obtain a forging with work hardening and residual stress on the surface;

[0014] Among them, during the pre-forging and final forging processes, the temperature of the pre-forging die and the final forging blank are the same.

[0015] As a preferred embodiment of the present invention, during the pre-forging process, the mold release agent is a water-based mold release agent, the mold release agent ratio is 1:5, the downward stroke of the die forging machine is 200mm, and the striking energy is 280r / min;

[0016] During the final forging process, the release agent is water-based, the ratio of the release agent is 1:5, the downward stroke of the die forging machine is 220mm, and the impact energy is 350r / min.

[0017] As a preferred embodiment of the present invention, during the roll forging process, the initial forging temperature is 460-480°C, and the die temperature is maintained at 160-180°C;

[0018] During the pre-forging process, the initial forging temperature is 420-460°C, the post-forging temperature is ≥380°C, and the die temperature is maintained at 160-180°C;

[0019] During the final forging process, the initial forging temperature is 420-460°C, the temperature after forging is ≥380°C, and the mold temperature is maintained at 160-180°C.

[0020] The present invention also provides a forging device for a lower fork arm of a front shock absorber for an automobile air suspension, comprising a heating furnace, a die forging machine and a forging track;

[0021] There are several die forging machines, and adjacent die forging machines are respectively equipped with a pre-forging die and a final forging die, the pre-forging die and the final forging die are both arranged horizontally, and the heating furnace is arranged vertically;

[0022] The forging track is provided with a transfer assembly, the transfer assembly can slide left and right on the forging track, the transfer assembly is provided with a fastener capable of clamping the blank, the fastener slides up and down on the transfer assembly through a slide rail, and a steering mechanism is provided between the transfer assembly and the fastener;

[0023] Among them, when the transfer component drives the billet to move to the heating furnace, the steering mechanism drives the billet to turn to the vertical direction, the slide rail slides and puts the billet downward into the heating furnace; when the transfer component drives the billet to move to the pre-forging die or the final forging die, the steering mechanism drives the billet to turn to the horizontal direction, the slide rail slides and places the billet horizontally into the pre-forging die or the final forging die.

[0024] As a preferred solution of the present invention, the forging track includes a back frame arranged on the side of the heating furnace and the die forging machine, the back frame is provided with a sliding track, the transfer assembly is installed on the sliding track through a sleeve, the sleeve passes through the back frame and is connected to a driving group, and the driving group drives the sleeve to slide back and forth on the sliding track;

[0025] The driving group drives the transfer assembly to reciprocate between the heating furnace and the pre-forging die and the final forging die;

[0026] The back frame is provided with a positioning rail, and the slide rail is buckled and arranged on the positioning rail through a fixing plate. When the kit moves, the fixing plate drives the slide rail to move along with the transfer assembly.

[0027] As a preferred solution of the present invention, the transfer assembly includes a bracket plate mounted on the slide rail, a sliding motor is arranged inside the bracket plate, and both sides of the sliding motor are connected to retractable rods passing through the bracket plate, and the retractable rods are connected to the fasteners through a steering mechanism;

[0028] As the retracting rod slides, the fastener performs a clamping action on the front end of the bracket plate.

[0029] As a preferred solution of the present invention, a push-pull rod is provided between the retracting rod and the steering mechanism, and the push-pull rod drives the steering mechanism to move closer to or away from the bracket plate, and the steering mechanism can slide horizontally driven by the push-pull rod.

[0030] As a preferred solution of the present invention, the steering mechanism comprises two arm plates respectively mounted on the retractable rods on the left and right sides, the buckle is rotatably mounted on the end of the arm plate away from the bracket plate, the buckle passes through the arm plate and is connected to a rocker, one end of the rocker is fixedly arranged with the buckle, and the other end of the rocker is rotatably connected to a telescopic pump;

[0031] The telescopic pump is vertically mounted on the push-pull rod, and the telescopic direction of the telescopic pump is perpendicular to the telescopic direction of the push-pull rod. As the telescopic pump is telescoped, the rocker moves and drives the buckle to rotate on the arm plate.

[0032] As a preferred solution of the present invention, the fastener comprises a first rotating member and a second rotating member respectively rotatably mounted on the two arm plates, the first rotating member and the second rotating member are respectively mounted on the two rockers, the first rotating member and the second rotating member are both semi-arc structures, and the width of the first rotating member and the second rotating member is the height of the cylindrical area at the end of the blank;

[0033] When the shrinking rod shrinks into the support plate, the first rotating member and the second rotating member fit together to clamp the cylindrical area at the end of the blank.

[0034] As a preferred solution of the present invention, the first rotating member and the second rotating member are provided with plug plates, and the plug plates are circular when they are attached together.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention solves the fluidity problem. First, multiple isothermal forgings are used to heat the blank to a suitable temperature multiple times. Meanwhile, the mold is heated to a temperature slightly lower than the blank forming temperature. Then, the blank is heated to a specified temperature multiple times. The aluminum alloy has greatly improved plasticity at this temperature. The blank is extruded at a slower downward speed of the forging press until the blank fills the mold cavity. The consistent metal flow direction can also greatly improve the shear resistance of the double fork arm. The performance of the product is much greater than that of the casting and one-step forging products.

[0037] The present invention is provided with a device for clamping blanks in various states, and at the same time, the blanks are transferred and position adjusted through an automatic steering and lifting device, so that forging, reheating and other steps can be quickly performed, the whole process is automated, the mechanical action is simple, and the production efficiency is greatly improved compared with the existing casting process;

[0038] The invention simplifies the steps of multiple isothermal forgings, has simple operation steps, and takes into account both the metal fluidity during forging and the simplicity of the forging steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0040] Figure 1 The present invention provides a schematic flow chart of a forging method for a lower wishbone of a front shock absorber for an automobile air suspension;

[0041] Figure 2 A schematic diagram of a forging method for a front shock absorber lower wishbone for an automobile air suspension provided by the present invention

[0042] Figure 3 A front view of a forged lower fork arm of a front shock absorber for an automobile air suspension provided by the present invention;

[0043] Figure 4 A billet diagram of a forging method for a lower wishbone of a front shock absorber for an automobile air suspension is provided for the present invention;

[0044] Figure 5 A roll forging blank diagram of a forging method of a lower wishbone of a front shock absorber for an automobile air suspension is provided for the present invention;

[0045] Figure 6 A schematic diagram of a pre-forged blank for a forging method of a lower wishbone of a front shock absorber for an automobile air suspension provided by the present invention;

[0046] Figure 7 Schematic diagram of the roll forging die structure of the forging method of the lower wishbone of the front shock absorber for automobile air suspension provided by the present invention

[0047] Figure 8 Schematic diagram of the pre-forging upper die structure of the forging method of the lower wishbone of the front shock absorber for automobile air suspension provided by the present invention

[0048] Fig. 9 Schematic diagram of the pre-forging lower die structure of the forging method of the lower wishbone of the front shock absorber for automobile air suspension provided by the present invention

[0049] Fig.10 The present invention provides a schematic diagram of the final forging upper die structure of the forging method of the lower wishbone of the front shock absorber for automobile air suspension

[0050] Fig.11 The present invention provides a schematic diagram of the final forging lower die structure of the forging method of the lower wishbone of the front shock absorber for automobile air suspension

[0051] Fig.12The present invention provides a schematic structural diagram of a forging device for a lower wishbone of a front shock absorber for an automobile air suspension;

[0052] Fig.13 The present invention provides Figure 2 Schematic diagram of the structural explosion of the fastener in the illustrated embodiment.

[0053] The numbers in the figure represent the following:

[0054] 1-forged track; 2-transfer assembly; 3-fastener; 4-slide rail; 5-steering mechanism;

[0055] 101-back frame; 102-sliding track; 103-kit; 104-driving group; 105-positioning track; 106-fixing plate;

[0056] 201- bracket plate; 202- retracting rod; 203- push-pull rod;

[0057] 301-first rotating member; 302-second rotating member; 303-insertion board;

[0058] 501-arm plate; 502-rocker; 503-telescopic pump. DETAILED DESCRIPTION

[0059] 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.

[0060] In order to improve metal fluidity and forging strength, Figure 1 As shown, the present invention provides a forging method for a lower wishbone of a front shock absorber for an automobile air suspension, comprising the following steps:

[0061] Step 1: First, place the initial blank for the lower wishbone of the front shock absorber for automobile air suspension into the heating furnace. The specific shape of the blank is shown in Figure 4 ;Will Figure 4 The initial blank is heated to 480-520°C and kept warm for 1-2 hours. The blank is roll forged by a roll forging machine to obtain a roll forged blank. The shape of the roll forged blank is as follows: Figure 5 As shown, the roll forging machine contains a roll forging die, and the structure of the roll forging die is as follows Figure 7 As shown;

[0062] Step 2: Use the transfer assembly to place the roll forging blank horizontally into the pre-forging die. The upper die and the lower die of the pre-forging die are as follows: Figure 8 and Fig. 9As shown, release, use a die forging machine to pre-forge the roll forging blank to obtain a pre-forged blank, the shape of the pre-forged blank is as shown Figure 6 As shown;

[0063] Step 3: Use a transfer assembly to lower the preforged billet into a heating furnace, reheat it to 480-520° C., and keep it at 480-520° C. for 1-2 hours to obtain a prefabricated billet. The temperature of the prefabricated billet when it is out of the furnace must be ≥480° C.

[0064] Step 4: Use the transfer assembly to place the prefabricated blank horizontally into the final forging die. The lower die and upper die of the final forging die are as follows: Fig.10 and Fig.11 As shown, the prefabricated blank is released, and the die forging machine is used to perform final forging on the prefabricated blank to obtain the final forging blank. The shape of the final forging blank is similar to Figure 2 , Figure 3 The same as shown;

[0065] Step 5: The final forging blank is subjected to water cooling, etching, pickling and shot blasting in sequence to obtain a forging with work hardening and residual stress on the surface.

[0066] In step 2 and step 4, the morphology of the pre-forging die and the final forging blank are different, but the temperature is the same.

[0067] In order to solve the fluidity problem, the present invention first adopts multiple isothermal forgings, heats the blank to a suitable temperature multiple times, heats the mold to a temperature slightly lower than the blank forming temperature, and then heats the blank to a specified temperature multiple times. The aluminum alloy greatly improves its plasticity at this temperature, and extrudes it at a slower downward speed of the forging press until the blank fills the mold cavity. The consistent metal flow direction can also greatly improve the shear resistance of the double fork arm, and the performance of the product is far greater than that of casting and one-step forging products.

[0068] Preferably, during the pre-forging process, the release agent is a water-based release agent, the ratio of the release agent is 1:5, the downward stroke of the die forging machine is 200 mm, and the striking energy is 280 r / min.

[0069] During the final forging process, the release agent is water-based, the ratio of the release agent is 1:5, the downward stroke of the die forging machine is 220mm, and the impact energy is 350r / min.

[0070] The temperature of the die during pre-forging and final forging is the same. The difference is that

[0071] In the present invention, preferably, during the roll forging process, the initial forging temperature is 460-480°C, and the die temperature is maintained at 160-180°C.

[0072] During the pre-forging process, the initial forging temperature is 420-460°C, the temperature after forging is ≥380°C, and the die temperature is maintained at 160-180°C.

[0073] During the final forging process, the initial forging temperature is 420-460°C, the temperature after forging is ≥380°C, and the mold temperature is maintained at 160-180°C.

[0074] In step 5, the final forging blank obtained in step 4 is trimmed, and the specific steps of water cooling are as follows: the forging blank after the trimming process is water-cooled, and the forging is cooled by water at 30-50°C.

[0075] The specific steps of etching are as follows: etching is performed after grinding away excess flash, the size of the forging blank after etching is inspected, and the forging blank without forging defects and forming defects is selected to obtain qualified forging blanks. The etching solution and time are soaking in a nitric acid solution with a mass fraction of 15% to 30% for 10 minutes, and then soaking in a NaOH solution with a mass fraction of 20% for 10 minutes.

[0076] The specific steps of pickling are as follows: after etching, the forging blank without forging defects and forming defects is pickled, placed in a solution with a mass ratio of opalescent agent: sulfuric acid: water of 5:2:93 at room temperature for 5 to 10 minutes for degreasing, then washed with clean water, and then polished with a grinding wheel machine; then use grinding liquid as a brightener for water polishing and vibration for 8 to 10 minutes, use a 20% NaOH solution for alkaline etching, treat at 40 to 50°C for 15 to 20 minutes, then wash with water, and then use a 30% HNO3 solution with a mass fraction for light treatment at room temperature for 1 to 2 minutes, and finally use 95°C hot water for sealing.

[0077] The specific steps of shot blasting are as follows: put the qualified forgings after pickling into the shot blasting machine for shot blasting, and shot blasting for 5 minutes to obtain forgings with certain surface work hardening and residual stress.

[0078] The following provides specific embodiments:

[0079] The following examples are provided to further illustrate the manufacture of the forgings:

[0080] The forging method of the lower wishbone of the front shock absorber for the air suspension of a new energy vehicle in this embodiment is specifically carried out according to the following steps:

[0081] 1. According to the part drawing, select 6082 aluminum alloy extrusion bar with a diameter of 85mm as the raw material, cut it into a billet with a length of 180mm along the extrusion direction, and obtain a billet with a specific specification of φ85×180mm. The elements and mass percentages of 6082 aluminum alloy extrusion profiles are shown in Table 1:

[0082] Table 1 Chemical composition of 6082 aluminum alloy (mass fraction, %)

[0083]

[0084] The rough material complies with the national standard for the composition of 6082 aluminum alloy; at the same time, the grain size requirement for 6082 aluminum alloy billet is less than or equal to the first-level grain size and the appearance is free of oil stains, aluminum chips, cracks, scratches, bubbles, corrosion, etc., and meets the appearance inspection standards without burrs and sharp corners.

[0085] 2. Heat the square billet after cutting to 480-520℃, and keep it at 480-520℃ for 1-2h to obtain the initial forged billet. At the same time, the temperature when it comes out of the furnace must be ≥480℃;

[0086] 3. The blank is roll forged at 480-460°C to obtain a roll forged blank. The roll forging is performed using a GD560 roll forging machine with an initial forging temperature of 480-460°C. During the roll forging process, the temperature of the die is always maintained between 160-180°C by the heating device.

[0087] 4. Pre-forge the blank at 420-460℃ to obtain a forged blank with flash. A 2500-ton die forging machine is used for pre-forging. A water-based release agent is used for lubrication during the forging process. The ratio of the release agent is 1:5. During pre-forging, the downward stroke of the forging press is 200mm, the impact energy is 280r / min, the initial forging temperature is 420-460℃, and the temperature after forging reaches ≥380℃. During the die forging process, the temperature of the die is always maintained between 160 and 180℃ under the action of the heating device.

[0088] 5. Heat the pre-forged billet to 480-520°C, and keep it at 480-520°C for 1-2 hours to obtain the initial forged billet. The temperature when it comes out of the furnace must be ≥480°C.

[0089] 6. Final forging is performed on the pre-forged blank at 420-460°C to obtain a forged blank with flash. A 2500-ton die forging machine is used for die forging. A water-based release agent is used for lubrication during the forging process. The ratio of the release agent is 1:5. During the final forging, the downward stroke of the forging press is 220mm, the impact energy is 350r / min, the initial forging temperature is 420-460°C, and the temperature after forging reaches ≥380°C. During the die forging process, the temperature of the die is always maintained between 160 and 180°C under the action of the heating device.

[0090] 7. The forging blank after trimming is water-cooled. The forging is cooled by water at 30-50°C, and the forging of the integrated valve is completed;

[0091] 8. After grinding away the excess flash, the forging blank is etched and cleaned. The size of the forging blank after etching is inspected, and the forging blank without forging defects and forming defects is selected to obtain qualified forging blanks. The etching solution and time are soaking in a nitric acid solution with a mass fraction of 15% to 30% for 10 minutes, and then soaking in a NaOH solution with a mass fraction of 20% for 10 minutes;

[0092] 9. After etching, the forging blanks without forging defects and forming defects are pickled, placed in a solution with a mass ratio of opalescent agent: sulfuric acid: water of 5:2:93 at room temperature for 5 to 10 minutes for degreasing, then washed with clean water, and then polished with a grinding wheel machine; then water-polished with abrasive liquid as a brightener for 8 to 10 minutes, alkaline-etched with a 20% NaOH solution at 40 to 50°C for 15 to 20 minutes, then washed with water, and then polished with a 30% HNO3 solution at room temperature for 1 to 2 minutes, and finally sealed with 95°C hot water;

[0093] 10. After pickling, the qualified forgings are placed in a shot blasting machine for shot blasting for 5 minutes to obtain forgings with a certain degree of work hardening and residual stress on the surface.

[0094] The production method described in this embodiment meets the performance requirements of the forged blank of the lower wishbone of the front shock absorber, reduces production costs, improves production efficiency, and achieves effective weight reduction of components. The metal structure of the product is denser, without defects such as sand holes and pores, and has better appearance quality. Compared with the existing casting process, the forging process is simple and greatly improves production efficiency.

[0095] The forging method can be used for metal components with a similar structure to the lower wishbone of the front shock absorber of a new energy vehicle.

[0096] In particular, although the present invention improves the fluidity of the metal during the forging process through multiple isothermal forgings, due to the need for isothermal forging, the blank needs to be taken out multiple times and placed in different molds after being heated to a suitable temperature. In fact, the operation is rather cumbersome and is not conducive to production.

[0097] In order to solve the problem of repeated heating and mold replacement in the process flow, the method of the present invention includes a device specifically for moving the mold, and the device participates in the entire forging process.

[0098] Specifically, Figures 2 to 12As shown, the present invention provides a forging device for the forging method of the lower wishbone of the front shock absorber for the above-mentioned automobile air suspension, which at least includes a heating furnace, a die forging machine and a forging track 1. This device mainly involves the movement process of the blank in the heating furnace and each die. At the same time, other devices are also common in the forging process, so other main forging devices are adaptively omitted.

[0099] There may be several die forging machines. In this embodiment, two die forging machines are provided. The two die forging machines are arranged adjacent to each other. One die forging machine is equipped with a pre-forging die, and the other die forging machine is equipped with a final forging die. In the embodiment shown in the present invention, the pre-forging die and the final forging die are both arranged horizontally, and the heating furnace is arranged vertically.

[0100] In particular, the end of the lower fork arm of the front shock absorber for the above-mentioned automobile air suspension has a cylindrical end, and this position appears in all stages of forging. A transfer component 2 is provided on the forging track 1, and the transfer component 2 can slide left and right on the forging track 1. A fastener 3 capable of clamping the blank is provided on the transfer component 2, and the fastener 3 can clamp the blank at all stages of forging, and the shape of the fastener 3 is adapted to the cylindrical position of the end of the blank.

[0101] The fastener 3 slides up and down on the transfer assembly 2 through the slide rail 4. A steering mechanism 5 is arranged between the transfer assembly 2 and the fastener 3. When the transfer assembly 2 drives the blank to move to the heating furnace, the steering mechanism 5 drives the blank to turn to the vertical direction, and the slide rail 4 slides and puts the blank downward into the heating furnace; when the transfer assembly 2 drives the blank to move to the pre-forging die or the final forging die, the steering mechanism 5 drives the blank to turn to the horizontal direction, and the slide rail 4 slides and places the blank horizontally into the pre-forging die or the final forging die.

[0102] In the present invention, the actions performed by the device during the entire forging process are as follows:

[0103] The transfer assembly 2 moves on the forging track 1 to the roll forging machine position, and the slide rail 4 drives the fastener 3 to move downward, and the fastener 3 is used to clamp the end of the roll forging blank;

[0104] The fastener 3 remains in the clamped state and rises, moves to the pre-forging die position, the slide rail 4 drives the fastener 3 down into the pre-forging die, releases, and the die forging machine pre-forges the roll forging blank;

[0105] The slide rail 4 drives the fastener 3 to descend into the pre-forging die again, clamps the end of the pre-forging blank, rises after clamping, moves to the heating furnace, maintains the clamping state, and the turning mechanism 5 drives the blank to turn to the vertical direction, descends and is put into the heating furnace, and is reheated to 480-520°C, and is kept warm at 480-520°C for 1-2 hours;

[0106] The slide rail 4 drives the prefabricated blank to rise, the steering mechanism 5 drives the fastener 3 to rotate back to the horizontal direction, the transfer assembly 2 moves it to the final forging die, descends, and releases it, and the die forging machine performs final forging on the prefabricated blank.

[0107] The present invention is provided with a device for clamping blanks in various states, and at the same time completes the transfer and position adjustment of the blank through an automatic steering and lifting device, so that it can quickly perform forging, reheating and other steps. The whole process is automated and the mechanical action is simple. Compared with the existing casting process, the production efficiency is greatly improved.

[0108] Furthermore, the forging track 1 is used to control the horizontal movement position of the blank. Specifically, the forging track 1 includes a back frame 101 arranged on the side of the heating furnace and the die forging machine, and a sliding track 102 is arranged on the back frame 101. The transfer component 2 is installed on the sliding track 102 through a kit 103. The kit 103 passes through the back frame 101 and is connected to a drive group 104. The drive group 104 drives the kit 103 to slide back and forth on the sliding track 102.

[0109] The driving group 104 drives the transfer assembly 2 to move back and forth between the heating furnace and the pre-forging die and the final forging die.

[0110] In order to prevent the slide rail 4 from tilting during movement, a positioning rail 105 is provided on the back frame 101, and the slide rail 4 is buckled and set on the positioning rail 105 through a fixing plate 106. When the kit 103 moves, the fixing plate 106 drives the slide rail 4 to move with the transfer assembly 2.

[0111] The main function of the transfer component 2 is to clamp and fix the blank. Specifically, the transfer component 2 includes a bracket plate 201 installed on the slide rail 4. A sliding motor is arranged inside the bracket plate 201. The two sides of the sliding motor are respectively connected with a retraction rod 202 through the bracket plate 201. The retraction rod 202 is connected to the fastener 3 through the steering mechanism 5.

[0112] As the retracting rod 202 slides, the fastener 3 clamps the front end of the bracket plate 201 .

[0113] When the contraction rod 202 contracts, the fastener 3 is in a clamping state, and when the contraction rod 202 expands, the fastener 3 releases the blank.

[0114] In the above step 1, a roll forging machine is required to roll forge the initial blank to obtain a roll forged blank. At this time, the fastener 3 can be used to clamp the initial blank to perform reciprocating roll forging action, thereby further improving the degree of automation.

[0115] Specifically, a push-pull rod 203 is provided between the retracting rod 202 and the steering mechanism 5 , and the push-pull rod 203 drives the steering mechanism 5 to move closer to or away from the bracket plate 201 . The steering mechanism 5 can slide horizontally driven by the push-pull rod 203 .

[0116] In the present invention, the steering mechanism 5 can be composed of any structure that can realize the steering of the blank. In order to simplify its operating steps, the steering mechanism 5 includes two arm plates 501 respectively installed on the left and right side retraction rods 202, and the fastener 3 is rotatably installed at the end of the arm plate 501 away from the bracket plate 201. The fastener 3 passes through the arm plate 501 and is connected to a rocker 502. One end of the rocker 502 is fixed to the fastener 3, and the other end of the rocker 502 is rotatably connected to a telescopic pump 503.

[0117] The telescopic pump 503 is vertically installed on the push-pull rod 203 , and the telescopic direction of the telescopic pump 503 is perpendicular to the telescopic direction of the push-pull rod 203 . As the telescopic pump 503 is extended and retracted, the rocker 502 moves and drives the fastener 3 to rotate on the arm plate 501 .

[0118] In the steering mechanism 5, the steering of the fastener 3 can be achieved only by the extension and retraction of the telescopic pump 503, which is simple to operate and easy to achieve.

[0119] When designing the fasteners specifically, they can be designed into any shape as long as they can clamp the blank. In particular, the present invention successively rolls, pre-forges, reheats and final forges the blank to finally obtain a lower fork arm of the front shock absorber for automobile air suspension with higher precision. The end of the lower fork arm of the front shock absorber for automobile air suspension is cylindrical during the roll forging stage, and this shape is consistent with the forgings obtained by pre-forging, reheating and final forging in the later stage, so the same fastener can be used to clamp the ends of the lower fork arm forgings of the front shock absorber in different periods.

[0120] In this embodiment, the fastener 3 includes a first rotating member 301 and a second rotating member 302 which are respectively rotatably mounted on two arm plates 501. The first rotating member 301 and the second rotating member 302 are respectively mounted on two rocking arms 502. The first rotating member 301 and the second rotating member 302 are both semi-arc structures. The width of the first rotating member 301 and the second rotating member 302 is the height of the cylindrical area at the end of the blank.

[0121] When the shrinking rod 202 shrinks into the support plate 201, the first rotating member 301 and the second rotating member 302 fit together to clamp the cylindrical area at the end of the blank.

[0122] In order to facilitate the separation of the blank from the mold, the first rotating member 301 and the second rotating member 302 are provided with a plug plate 303, which is circular when attached together. When the fastener 3 contacts the blank downward, the plug plate 303 is attached between the blank and the mold, which facilitates the separation between the blank and the mold.

[0123] Through the forging method and device of the lower wishbone of the front shock absorber for the automobile air suspension of this embodiment, the blank can be reciprocatedly heated and forged between the roll forging machine, the pre-forging die, the heating furnace, and the final forging die, which simplifies the steps of multiple isothermal forgings, the operating steps are simple, and the metal fluidity during forging and the simplicity of the forging steps are taken into account.

[0124] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A forging method for a lower wishbone of a front shock absorber for an automobile air suspension, characterized in that: The steps include: The initial blank is heated to 480-520° C., kept at this temperature for 1-2 hours, and roll-forged by a roll forging machine to obtain a roll-forged blank; Using a transfer assembly to clamp the roll forging blank and place it horizontally into a pre-forging die, releasing it, and using a die forging machine to pre-forge the roll forging blank to obtain a pre-forged blank; Use a transfer assembly to put the preforged billet downward into a heating furnace, reheat it to 480-520° C., and keep it at 480-520° C. for 1-2 hours to obtain a prefabricated billet. The temperature of the prefabricated billet when it is taken out of the furnace must be ≥480° C. Using a transfer assembly to clamp the prefabricated blank horizontally and place it in a final forging die, releasing it, and performing final forging on the prefabricated blank using a die forging machine to obtain a final forging blank; The final forging blank is subjected to water cooling, etching, pickling and shot blasting in sequence to obtain a forging with work hardening and residual stress on the surface; Among them, during the pre-forging and final forging processes, the temperature of the pre-forging die and the final forging blank are the same.

2. The forging method of the lower wishbone of the front shock absorber for automobile air suspension according to claim 1, characterized in that: During the pre-forging process, the release agent is water-based, the ratio of the release agent is 1:5, the downward stroke of the die forging machine is 200mm, and the impact energy is 280r / min; During the final forging process, the release agent is water-based, the ratio of the release agent is 1:5, the downward stroke of the die forging machine is 220mm, and the impact energy is 350r / min.

3. The forging method of the lower wishbone of the front shock absorber for automobile air suspension according to claim 1, characterized in that: During the roll forging process, the initial forging temperature is 460-480°C and the die temperature is maintained at 160-180°C; During the pre-forging process, the initial forging temperature is 420-460°C, the post-forging temperature is ≥380°C, and the die temperature is maintained at 160-180°C; During the final forging process, the initial forging temperature is 420-460°C, the temperature after forging is ≥380°C, and the mold temperature is maintained at 160-180°C.

4. A forging device for a lower fork arm of a front shock absorber for an automobile air suspension, applied to a forging method for a lower fork arm of a front shock absorber for an automobile air suspension as claimed in any one of claims 1 to 3, characterized in that: The forging device comprises a heating furnace, a die forging machine and a forging track (1); There are several die forging machines, and adjacent die forging machines are respectively equipped with a pre-forging die and a final forging die, the pre-forging die and the final forging die are both arranged horizontally, and the heating furnace is arranged vertically; The forging track (1) is provided with a transfer assembly (2), the transfer assembly (2) can slide left and right on the forging track (1), the transfer assembly (2) is provided with a fastener (3) capable of clamping the blank, the fastener (3) slides up and down on the transfer assembly (2) through a slide rail (4), and a steering mechanism (5) is provided between the transfer assembly (2) and the fastener (3); When the transfer component (2) drives the blank to move to the heating furnace, the steering mechanism (5) drives the blank to turn to the vertical direction, and the slide rail (4) slides and puts the blank downward into the heating furnace; when the transfer component (2) drives the blank to move to the pre-forging die or the final forging die, the steering mechanism (5) drives the blank to turn to the horizontal direction, and the slide rail (4) slides and places the blank horizontally into the pre-forging die or the final forging die.

5. The forging device for the lower wishbone of the front shock absorber for automobile air suspension according to claim 4, characterized in that: The forging track (1) comprises a back frame (101) arranged on the side of the heating furnace and the die forging machine, the back frame (101) is provided with a sliding track (102), the transfer component (2) is mounted on the sliding track (102) through a sleeve (103), the sleeve (103) passes through the back frame (101) and is connected to a driving group (104), and the driving group (104) drives the sleeve (103) to slide back and forth on the sliding track (102); The driving group (104) drives the transfer assembly (2) to move back and forth between the heating furnace and the pre-forging die and the final forging die; The back frame (101) is provided with a positioning rail (105), and the slide rail (4) is buckled and arranged on the positioning rail (105) through a fixing plate (106). When the kit (103) moves, the fixing plate (106) drives the slide rail (4) to move along with the transfer assembly (2).

6. The forging device for the lower wishbone of the front shock absorber for automobile air suspension according to claim 4, characterized in that: The transfer assembly (2) comprises a support plate (201) mounted on the slide rail (4), a sliding motor is arranged inside the support plate (201), and both sides of the sliding motor are connected to retractable rods (202) passing through the support plate (201), and the retractable rods (202) are connected to the fastener (3) via a steering mechanism (5); As the retractable rod (202) slides, the fastener (3) performs a clamping action on the front end of the bracket plate (201).

7. The forging device for the lower wishbone of the front shock absorber for automobile air suspension according to claim 6, characterized in that: A push-pull rod (203) is provided between the retracting rod (202) and the steering mechanism (5), and the push-pull rod (203) drives the steering mechanism (5) to move closer to or away from the bracket plate (201). The steering mechanism (5) can slide horizontally under the drive of the push-pull rod (203).

8. The forging device for the lower wishbone of the front shock absorber for automobile air suspension according to claim 7, characterized in that: The steering mechanism (5) comprises two arm plates (501) respectively mounted on the retractable rods (202) on the left and right sides, the buckle (3) is rotatably mounted on the end of the arm plate (501) away from the bracket plate (201), the buckle (3) passes through the arm plate (501) and is connected to a rocker (502), one end of the rocker (502) is fixedly arranged with the buckle (3), and the other end of the rocker (502) is rotatably connected to a telescopic pump (503); The telescopic pump (503) is vertically installed on the push-pull rod (203), and the telescopic direction of the telescopic pump (503) is perpendicular to the telescopic direction of the push-pull rod (203). As the telescopic pump (503) is extended and retracted, the rocker (502) moves and drives the fastener (3) to rotate on the arm plate (501).

9. The forging device for the lower wishbone of the front shock absorber for automobile air suspension according to claim 8, characterized in that: The fastener (3) comprises a first rotating member (301) and a second rotating member (302) which are respectively rotatably mounted on the two arm plates (501); the first rotating member (301) and the second rotating member (302) are respectively mounted on the two rocking arms (502); the first rotating member (301) and the second rotating member (302) are both semi-arc structures; the width of the first rotating member (301) and the second rotating member (302) is the height of the cylindrical region at the end of the blank; When the shrinking rod (202) shrinks into the support plate (201), the first rotating member (301) and the second rotating member (302) fit together to form a clamp for the cylindrical region at the end of the blank.

10. The forging device for the lower wishbone of the front shock absorber for automobile air suspension according to claim 9, characterized in that: The first rotating member (301) and the second rotating member (302) are provided with plugging plates (303), and the plugging plates (303) are circular when they are attached together.

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