阅读说明：本技术 一种汽车底盘锻件短流程锻造工艺 (Short-process forging process for automobile chassis forge piece ) 是由 周标 郭成强 徐银龙 李檀 林国峰 徐旭东 于 2021-12-10 设计创作，主要内容包括：本发明涉及一种汽车底盘锻件短流程锻造工艺,属于铝合金锻造技术领域。本发明公开了一种汽车底盘锻件短流程锻造工艺,所述工艺包括如下步骤：将铝合金棒料依次进行辊锻、弯曲、预锻、终锻、机加工、热处理、表面处理,辊锻过程中的辊锻模具温度低于预锻和终锻中的模具温度,预锻成型温度高于终锻成型温度。(The invention relates to a short-process forging process for an automobile chassis forge piece, and belongs to the technical field of aluminum alloy forging. The invention discloses a short-process forging process for an automobile chassis forge piece, which comprises the following steps: the method comprises the following steps of sequentially carrying out roll forging, bending, pre-forging, finish forging, machining, heat treatment and surface treatment on an aluminum alloy bar, wherein the temperature of a roll forging die in the roll forging process is lower than the temperature of dies in the pre-forging and the finish forging, and the pre-forging forming temperature is higher than the finish forging forming temperature.)

1. The short-process forging process for the automobile chassis forge piece is characterized by comprising the following steps of: the method comprises the following steps of sequentially carrying out roll forging, bending, pre-forging, finish forging, machining, heat treatment and surface treatment on an aluminum alloy bar, wherein the temperature of a roll forging die in the roll forging process is lower than the temperature of dies in the pre-forging and the finish forging, and the pre-forging forming temperature is higher than the finish forging forming temperature.

2. The short-process forging process for the automobile chassis forging piece as claimed in claim 1, wherein the aluminum alloy bar stock is preheated at 500-540 ℃.

3. The short-flow forging process for the automobile chassis forging piece as claimed in claim 1, wherein the temperature of the roll forging die in the roll forging process is 100-150 ℃, the temperature of the pre-forging die is 150-200 ℃, and the temperature of the finish forging die is 150-200 ℃.

4. The short-flow forging process for the automobile chassis forging piece as claimed in claim 1, wherein the pre-forging forming temperature is 450-500 ℃, and the finish-forging forming temperature is 420-470 ℃.

5. The short-flow forging process for the automobile chassis forging piece as claimed in claim 1, wherein the temperature of the material after roll forging is 480-520 ℃, the temperature of the product after pre-forging is 430-480 ℃, and the temperature of the product after final forging is 400-450 ℃.

6. The short-process forging process for the automobile chassis forging piece as claimed in claim 1, wherein the bending angle in the bending process is 100-120 degrees.

7. The short-flow forging process for automobile chassis forgings according to claim 1, wherein the heat treatment comprises solution treatment, quenching and aging treatment.

8. The short-flow forging process for the automobile chassis forging piece as claimed in claim 7, wherein the solid solution temperature is 510-540 ℃, and the heat preservation time is 2-4 h.

9. The short-process forging process of the automobile chassis forge piece according to claim 7, wherein the quenching water temperature is 30-50 ℃, the quenching delay time is less than or equal to 20s, and the quenching time is 10-20 min.

10. The short-process forging process for the automobile chassis forging piece as claimed in claim 7, wherein the aging temperature is 160 ℃ and 190 ℃, and the heat preservation time is 6-10 h.

Technical Field

The invention belongs to the technical field of aluminum alloy forging, and relates to a short-process forging process for an automobile chassis forge piece.

Background

The automobile chassis serves as an important component of an automobile, plays a role in supporting an engine and each component assembly, and in order to ensure the safety and smoothness of the automobile in the driving process, the automobile chassis needs to have the performances of high strength, high toughness, corrosion resistance and the like.

Aluminum alloy has been applied in many fields because of its advantages such as small density, high specific strength, and the like, and particularly, with the progress of automobile lightweight, aluminum alloy forgings are more and more emphasized and are in a rapid development stage. Conventional steel components are currently replaced by lighter aluminum alloy forgings that have been used for axles, chassis components such as extruded hubs, drive shafts, and suspension members, and can also be used for connecting rods, pistons, etc. in engine parts.

In the aluminum alloy forging process, on one hand, the alloy components and the forging temperature directly influence the shaping of the alloy, and on the other hand, the shaping of the aluminum alloy containing different alloy elements has different sensitivity degrees on the deformation speed, so the selection of the aluminum alloy is particularly important. The 6XXX series alloy belongs to Al-Mg-Si series, represented by 6082 aluminum alloy, is a heat treatment type corrosion-resistant aluminum alloy, does not generate a strain form of tensile strain marks after forming, has higher performance and can maintain sufficient safety; in the process of thermal forging, the aluminum alloy section has no oxide scale on the surface, less forging allowance, better corrosion resistance and no stress corrosion cracking phenomenon, so the aluminum alloy section is often used as forged aluminum alloy. However, the alloy has high content of alloy elements, large deformation resistance and narrow forging temperature window (about 100 ℃), and the forging process is difficult to control.

In the design of the forging process, the actual forging temperature directly influences the forging process performance of the aluminum alloy except for considering the deformation capacity of the alloy. The aluminum alloy has fast heat conduction, so the connection between the temperature monitoring of the forging die and the forging process can affect the yield of the aluminum alloy forgings. The amount of forging distortion can determine the flow of the alloy within the die cavity, thereby affecting the microstructure of the alloy. The forging pass is matched with the deformation of each pass, so that the yield, the structure, the performance and the energy consumption of the aluminum alloy forging can be determined. The surface coarse crystal layer is also a great important factor influencing the product yield, the surface coarse crystal layer often appears outside the wall thickness of the profile, and the profile in a wide and flat shape is easy to appear at two ends in the width direction. The depth of the surface coarse-grained layer is relatively deep, which has a great influence on the tensile strength, yield strength, elongation and fatigue performance of the material, so that the depth of the surface coarse-grained layer needs to be reduced. However, the material performance is not only affected by the surface coarse crystal layer, and when other defects such as segregation and porosity exist in the material, the yield is greatly reduced. At present, the production process flow of the domestic forged aluminum alloy is long, and generally comprises the working procedures of ingot casting → homogenization → extrusion → blanking, cleaning, peeling → intermediate frequency heating → roller forging → bending, flattening → secondary heating → pre-forging, final forging → trimming, punching, correcting and the like, and has the problems of more working procedures, high energy consumption, low product quality, poor stability, insufficient performance and the like.

Disclosure of Invention

The invention aims to provide a short-process forging process for an automobile chassis forge piece, which is short in process, low in energy consumption, high in product qualification rate, controllable in process and high in precision, and aims to solve the problems in the prior art.

The purpose of the invention can be realized by the following technical scheme: a short-process forging process for an automobile chassis forge piece comprises the following steps: the method comprises the following steps of sequentially carrying out roll forging, bending, pre-forging, finish forging, machining, heat treatment and surface treatment on an aluminum alloy bar, wherein the temperature of a roll forging die in the roll forging process is lower than the temperature of dies in the pre-forging and the finish forging, and the pre-forging forming temperature is higher than the finish forging forming temperature.

According to the invention, the bending die, the pre-forging die and the finish forging die are arranged on the die holder of the die forging press at the same time, so that the bending, pre-forging and finish forging processes are continuously carried out, the heat loss is small, multiple heating and heat preservation are not needed in the forging process, and the forging time is obviously shortened; and the defects of as-cast porosity and the like generated in the smelting process of metal are eliminated in the forging process, the microstructure is optimized, the complete metal streamline is saved, and the mechanical property of the forging is better. Meanwhile, the process from the deformation of the heated bar stock to the completion of the forging of the product is continuously produced, and the product after the completion of each process is carried to the next process by a manipulator, so that the method is suitable for the forging and forming of various types of products, and the production efficiency of the product is obviously improved.

Preferably, the aluminum alloy bar stock is preheated at 500-540 ℃.

Preferably, the temperature of the roll forging die in the roll forging process is 100-150 ℃, the temperature of the pre-forging die is 150-200 ℃, and the temperature of the finish forging die is 150-200 ℃.

The temperature of each die is controlled because the die temperature affects the flow deformation of the material in the die cavity, which may cause defects such as folding and starving. The temperature of the roll forging die during roll forging is lower than the die temperature during pre-forging and finish forging, and the die temperature during pre-forging and finish forging can be the same or similar.

Preferably, the pre-forging forming temperature is 450-500 ℃, and the final forging forming temperature is 420-470 ℃.

Aluminum alloys themselves conduct heat quickly, so it is necessary to monitor the temperature during forging and control the quality of the forgings in conjunction with the forging process. In the forging process, over-high temperature, over-low temperature or over-large temperature change degree easily form coarse grain structures, and the mechanical property of the aluminum alloy forging is reduced and unstable due to coarse grains and uneven grain structures, so that the fatigue strength, the corrosion resistance and the impact toughness of the forging are influenced. The temperature is gradually reduced in the forging process, the change degree is small, and the internal structure of the material can be kept uniform.

Preferably, the temperature of the material after roll forging is 480-520 ℃, the temperature of the product after pre-forging is 430-480 ℃, and the temperature of the product after final forging is 400-450 ℃.

The forging temperature of the three steps of forging continuously corresponds to the temperature after forging, so that the temperature change is avoided being overlarge, the service life of the die is ensured, and the flowing resistance of metal is reduced.

Preferably, the bending process bends at an angle of 100-120 degrees.

The bending angle also influences the internal performance of the product, and after the bar is bent, the inner side is pressed and folded due to an excessively small angle, the outer side is pulled, the area is reduced, cracks are formed, the cross section is increased, and resilience occurs; too great a bend relief angle can result in an undesirable product shape. The length and the diameter of the bar stock are controlled to meet the requirement that the bending radius is larger than the minimum allowable bending radius of the material; the bending speed is controlled, and the rebound phenomenon is avoided. The conventional triangular control arm is limited in process, so that the bending rear angle is unreasonable; the invention realizes the bending angle of 100 plus 120 degrees by controlling the parameters such as the temperature of the bar stock, and the like, ensures the performance of the forged piece and avoids defects. When the product is rectilinear, the bending step can be omitted. The forging process is combined with the post-treatment process, so that the finished product still has good mechanical property when the bar is in the most suitable bending degree for pre-forging, and the depth of the coarse crystal layer on the surface is small.

And flattening is needed after the conventional bending step, the blank can transversely extend by flattening, the area covering the pre-forging cavity is increased, and the pre-forging piece can be conveniently formed. However, the addition of a flattening process requires the addition of a separate flattening die, and the flattened bar stock is not conducive to automated handling. The invention cancels the flattening procedure and sets continuous mechanized forging process; by adopting the process flow of the invention, the high-efficiency forming of the forge piece can be realized even without the flattening step.

Preferably, the surface treatment machining comprises trimming and punching.

Further preferably, the temperature when the edge is cut is 400-450 ℃.

More preferably, the sizes of the punch and the cutting edge are amplified by a certain coefficient according to the temperature of the final forged piece during trimming, and the scaling coefficient is 1.01.

And directly carrying out hot trimming on the forged product without cooling, and punching the product. The thermal expansion coefficient of the aluminum alloy at 20 ℃ is 23.21E-6/K, and the linear size is enlarged by about 1.008-1.01 times at the temperature of 400-450 ℃, so the size of the punched hole needs to be scaled, and the size of the cooled product meets the requirement.

Preferably, the heat treatment includes solution treatment, quenching and aging treatment.

More preferably, the solid solution temperature is 510-540 ℃, and the heat preservation time is 2-4 h.

Further preferably, the quenching water temperature is 30-50 ℃, the quenching delay time is less than or equal to 20s, and the quenching time is 10-20 min.

The quenching delay time is shortened, the temperature of the material is prevented from being greatly reduced, and the internal structure form is changed.

Further preferably, the aging temperature is 160-.

Preferably, the surface treatment comprises acidity, flaw detection and shot blasting.

Further preferably, the pickling solvent in the pickling process is 20% -40% of nitric acid, and the time is 60-120 s; the flaw detection process is one or more of fluorescence penetration flaw detection and ultrasonic flaw detection.

Further preferably, the diameter of the steel shot used in the shot blasting process is 0.1-1.0mm, and the shot blasting time is 1-5 minutes.

Compared with the prior art, the invention has the following beneficial effects.

1. The invention has the advantages of short process flow, low energy consumption, high product qualification rate and controllable process, and overcomes the defects of folding and the like.

2. The process is adjusted according to the finished product of the forged piece, and the angle of the triangular control arm after bending can be controlled at 100 degrees and 120 degrees; the straight connecting rod does not need to be bent, and punching is not needed after forging; the bent connecting arm does not need to be roll forged and does not need to be punched after forging.

3. The invention controls the continuity of the forging process and the temperature of each process, so that the manufactured forging has the properties of high strength, good toughness and corrosion resistance, and the depth of the surface coarse crystal layer is small.

4. The forging piece prepared by the method is applied to the automobile chassis, and can meet the requirements of the automobile chassis on high strength, high toughness and corrosion resistance.

5. The process of the invention has high degree of mechanization, reduces manual steps and is suitable for industrialized production.

Drawings

FIG. 1 is a cross-sectional view of coarse crystals of a product in example 1 of the present invention.

FIG. 2 is a cross-sectional view of coarse crystals of a product in example 2 of the present invention.

FIG. 3 is a cross-sectional view of coarse crystals of a product in example 3 of the present invention.

FIG. 4 is a cross-sectional view of coarse crystals of a product obtained in example 4 of the present invention.

FIG. 5 is a sectional view of coarse crystals of the product of comparative example 2 of the present invention.

Detailed Description

The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.

Example 1

The forging whole process of the triangular control arm of the automobile comprises the following steps: heating a bar, roll forging, bending, pre-forging, finish forging, trimming, punching, heat treatment, acid cleaning and flaw detection, and shot blasting.

Heating 6110 aluminum alloy bar stock of D63mm-L500mm to 520 ℃ in a material heating furnace; discharging the heated bar stock out of the furnace, conveying the bar stock to a roll forging machine by a conveying belt for roll forging, and preheating a roll forging die to 120 ℃ in advance; clamping the roll-forged bar by a robot, putting the bar on a bending die in a forging press, and bending to 110 degrees; picking and placing the bent bar stock by a manipulator clamp until a preforging die is forged at 470 ℃, then placing a finish forging die for forging at 440 ℃, and preheating the preforging die and the finish forging die to 160 ℃ in advance; conveying the final forged product to a trimming die by a manipulator, and trimming and punching at 420 ℃; manually loading the trimmed product into a special heat treatment frame, then carrying out solid solution treatment, automatically putting the product into a water tank with the water temperature of 40 ℃ for quenching after heat preservation is carried out for 2 hours at 530 ℃, finishing the action from opening a furnace door until the product is completely immersed in water within 20s, carrying out aging treatment after the product stays in the water tank for 15min, wherein the aging temperature is 170 ℃, and the heat preservation time is 8 hours; after the surface dirt of the product after the heat treatment is removed by acid washing and alkali washing, carrying out fluorescence penetration flaw detection, and detecting the defects of cracks, overlapping, bubbles and the like on the surface of the product; and (4) performing shot blasting on the qualified forged piece after acid cleaning inspection, and finally packaging the obtained automobile triangular control arm into a warehouse. Specific performance data are shown in table 1; the depth of the coarse crystal layer on the surface of the product is shown in figure 1.

Example 2

The forging whole process of the automobile linear type connecting rod comprises the following steps: heating a bar stock, roll forging, pre-forging, finish forging, trimming, heat treatment, acid pickling and flaw detection, and shot blasting.

Heating 6110 aluminum alloy bar stock of D43mm-L390mm to 540 ℃ in a material heating furnace; discharging the heated bar stock out of the furnace, conveying the bar stock to a roll forging machine by a conveying belt for roll forging, and preheating a roll forging die to 150 ℃ in advance; the rod material after roll forging is clamped by a robot and placed on a preforging die in a forging press to be forged at 460 ℃, then the rod material is placed in a finish forging die to be forged at 430 ℃, and the preforging die and the finish forging die are preheated to 160 ℃ in advance; conveying the final-forged product to a trimming die by a manipulator, and trimming at 410 ℃; manually loading the trimmed product into a special heat treatment frame, then carrying out solid solution treatment, automatically putting the product into a water tank with the water temperature of 45 ℃ for quenching after heat preservation is carried out for 2 hours at 540 ℃, finishing the action from opening a furnace door until the product is completely immersed in water within 19s, carrying out aging treatment after the product stays in the water tank for 16min, wherein the aging temperature is 185 ℃, and the heat preservation time is 8 hours; after the surface dirt of the product after the heat treatment is removed by acid washing and alkali washing, carrying out fluorescence penetration flaw detection, and detecting the defects of cracks, overlapping, bubbles and the like on the surface of the product; and (4) performing surface treatment on the qualified forge piece after acid washing inspection through shot blasting, and finally packaging and warehousing the obtained linear connecting rod of the automobile. The finished product of the forging is a straight connecting rod, the shape is simple, bending is not needed, punching is not needed after forging, but the volume distribution of the product is not uniform, and roll forging is still needed. Specific performance data are shown in table 1; the depth of the coarse crystal layer on the surface of the product is shown in figure 2.

Example 3

The whole forging process of the automobile bending control arm comprises the following steps: heating a bar, bending, pre-forging, finish forging, trimming, heat treatment, acid pickling and flaw detection, and shot blasting.

Heating 6110 aluminum alloy bar stock of D48mm-L410mm to 530 ℃ in a material heating furnace; the heated bar stock is clamped by a robot and put on a bending die in a forging press to be bent to 116 degrees; the bent bar stock is picked and placed by a manipulator clamp until a preforging die is forged at 490 ℃, then a finish forging die is placed for forging at 440 ℃, and the preforging die and the finish forging die are preheated to 180 ℃ in advance; conveying the final forged product to a trimming die by a manipulator for trimming at 440 ℃; manually loading the trimmed product into a special heat treatment frame, then carrying out solid solution treatment, automatically putting the product into a water tank with the water temperature of 30 ℃ for quenching after heat preservation is carried out for 2 hours at 540 ℃, finishing the action from opening a furnace door until the product is completely immersed in water within 17s, carrying out aging treatment after the product stays in the water tank for 18min, wherein the aging temperature is 180 ℃, and the heat preservation time is 7 hours; after the surface dirt of the product after the heat treatment is removed by acid washing and alkali washing, carrying out fluorescence penetration flaw detection, and detecting the defects of cracks, overlapping, bubbles and the like on the surface of the product; and (4) performing surface treatment on the qualified forge piece after acid cleaning inspection through shot blasting, and finally packaging and warehousing the obtained bent control arm. The finished product of the forging is a bent connecting arm and needs to be bent, but the volume distribution of the product is uniform, roll forging is not needed, and punching is not needed after forging. Specific performance data are shown in table 1; the depth of the coarse crystal layer on the surface of the product is shown in figure 3.

Example 4

The whole forging process of the automobile battery box support comprises the following steps: heating a bar, roll forging, bending, pre-forging, finish forging, trimming, heat treatment, acid cleaning, flaw detection, shot blasting and packaging.

Heating a 6082 aluminum alloy bar stock of D85mm-L300mm to 520 ℃ in a material heating furnace; discharging the heated bar stock out of the furnace, conveying the bar stock to a roll forging machine by a conveying belt for roll forging, and preheating a roll forging die to 130 ℃ in advance; clamping the roll-forged bar by a robot, putting the bar on a bending die in a forging press, and bending to 120 degrees; the bent bar stock is taken and placed by a manipulator clamp until a preforging die is forged at 480 ℃, then a finish forging die is placed at 425 ℃ for forging, the preforging die is preheated to 180 ℃ in advance, and the finish forging die is preheated to 175 ℃ in advance; conveying the final-forged product to a trimming die by a manipulator for trimming at 420 ℃; manually loading the trimmed product into a special heat treatment frame, then carrying out solid solution treatment, automatically putting the product into a water tank with the water temperature of 35 ℃ for quenching after heat preservation is carried out for 2 hours at 525 ℃, finishing the action from opening a furnace door until the product is completely immersed in water within 19s, carrying out aging treatment after the product stays in the water tank for 14min, wherein the aging temperature is 170 ℃, and the heat preservation time is 8 hours; after the surface dirt of the product after the heat treatment is removed by acid washing and alkali washing, carrying out fluorescence penetration flaw detection, and detecting the defects of cracks, overlapping, bubbles and the like on the surface of the product; and (4) performing surface treatment on the qualified forged piece after acid cleaning inspection through shot blasting, and finally packaging and warehousing the obtained battery box support. Specific performance data are shown in table 1; the depth of the coarse crystal layer on the surface of the product is shown in figure 4.

Example 5

Compared with the embodiment 1, the difference is that 6110 aluminum alloy bar stock is heated to 525 ℃ in a material heating furnace; discharging the heated bar stock out of the furnace, conveying the bar stock to a roll forging machine by a conveying belt for roll forging, and preheating a roll forging die to 120 ℃ in advance; clamping the roll-forged bar by a robot, putting the bar on a bending die in a forging press, and bending the bar to 90 degrees; picking and placing the bent bar by a manipulator clamp until a preforging die is forged at 470 ℃, then placing a finish forging die for forging at 440 ℃, and preheating the preforging die and the finish forging die to 165 ℃ in advance; conveying the final forged product to a trimming die by a manipulator, and trimming and punching at 440 ℃; manually loading the trimmed product into a special heat treatment frame, then carrying out solid solution treatment, automatically putting the product into a water tank with the water temperature of 40 ℃ for quenching after heat preservation is carried out for 2 hours at 530 ℃, finishing the action from opening a furnace door until the product is completely immersed in water within 20s, carrying out aging treatment after the product stays in the water tank for 15min, wherein the aging temperature is 170 ℃, and the heat preservation time is 8 hours. Because the shape of the bent bar does not meet the requirement, the flow speed of the materials at each part of the preforging cavity is inconsistent, and the materials converge to form the folding. Specific performance data are shown in table 1.

Example 6

Compared with the embodiment 1, the difference is that 6110 aluminum alloy bar stock is heated to 520 ℃ in a material heating furnace; discharging the heated bar stock out of the furnace, conveying the bar stock to a roll forging machine by a conveying belt for roll forging, and preheating a roll forging die to 130 ℃ in advance; clamping the roll-forged bar by a robot, putting the bar on a bending die in a forging press, and bending the bar to 140 degrees; picking and placing the bent bar by a manipulator clamp until a preforging die is forged at 460 ℃, then placing a finish forging die for forging at 440 ℃, and preheating the preforging die and the finish forging die to 160 ℃ in advance; conveying the final forged product to a trimming die by a manipulator, and trimming and punching at 440 ℃; manually loading the trimmed product into a special heat treatment frame, then carrying out solid solution treatment, automatically putting the product into a water tank with the water temperature of 40 ℃ for quenching after heat preservation is carried out for 2 hours at 530 ℃, finishing the action from opening a furnace door until the product is completely immersed in the water within 18s, carrying out aging treatment after the product stays in the water tank for 16min, wherein the aging temperature is 170 ℃, and the heat preservation time is 8 hours. Because the shape of the bent bar does not meet the requirement, the flow speed of the material at each part of the preforging cavity is inconsistent, and the thickness of each part of the material is not uniform. Specific performance data are shown in table 1.

Comparative example 1

The difference compared to example 1 is that the forged product was directly subjected to a performance test without heat treatment. Specific performance data are shown in table 1.

Comparative example 2

The automobile triangular control arm is manufactured through the conventional forging whole process, and the specific process comprises the following steps: heating a bar, roll forging, bending, flattening, secondary heating, pre-forging, final forging, trimming, punching, heat treatment, acid cleaning and flaw detection, and shot blasting.

Heating 6110 aluminum alloy bar stock of D63mm-L500mm to 530 ℃ in a material heating furnace; discharging the heated bar stock out of the furnace, conveying the bar stock to a roll forging machine by a conveying belt for roll forging, and preheating a roll forging die to 125 ℃ in advance; manually clamping and placing the roll-forged bar stock on a bending die in a forging press, and bending to a required angle of 95 degrees; manually clamping and placing the bent bar on a flattening die for flattening; the flattened bar needs to be heated for the second time, then the bar is taken and placed by a manual clamp until a preforging die is forged at 475 ℃, then a finish forging die is placed for forging at 420 ℃, and the preforging die and the finish forging die are preheated to 170 ℃ in advance; the final forged product is manually conveyed to a trimming die for trimming at 430 ℃; punching the trimmed product on a punching die; manually loading the punched product into a special heat treatment frame, then carrying out solid solution treatment, automatically putting the product into a water tank with the water temperature of 40 ℃ for quenching after heat preservation is carried out for 3 hours at the temperature of 520 ℃, finishing the action from opening a furnace door until the product is completely immersed in the water within 20s, carrying out aging treatment after the product stays in the water tank for 18min, wherein the aging temperature is 170 ℃, and the heat preservation time is 8 hours; after the surface dirt of the product after the heat treatment is removed by acid washing and alkali washing, carrying out fluorescence penetration flaw detection, and detecting the defects of cracks, overlapping, bubbles and the like on the surface of the product; and (4) performing shot blasting on the qualified forged piece after acid cleaning inspection, and finally packaging the automobile triangular control arm obtained by the conventional method into a warehouse. The conventional method needs a flattening procedure, the edge cutting and the punching are carried out in two procedures, the forging production is carried out manually, the production efficiency is low, and the process parameters are not easy to control; the product has long time consumption, large temperature change and unstable quality of finished products when transferred among the working procedures. Specific performance data are shown in table 1; the depth of the coarse crystal layer on the surface of the product is shown in figure 5.

TABLE 1 forging Performance data sheet.

Observing the coarse-grain cross-sectional views of the products of examples 1-4 of the present invention, i.e., fig. 1-4, it can be seen that the internal structure of the products obtained by the process of the present invention is uniform. The product obtained by the conventional method is shown in fig. 5, the internal structure is unevenly distributed, larger crystal grains appear, and the depth of a coarse crystal layer on the surface is large. Compared with the process of the invention, the conventional method has more steps, complex process, longer time consumption and higher energy consumption.

In conclusion, the process flow is short, the energy consumption is low, the product qualification rate is high, the process is controllable, and the defects of folding and the like are eliminated; the degree of mechanization is high, the manual steps are reduced, and the method is suitable for industrial production; the adjusting device can be adjusted according to the finished product of the forge piece, the straight connecting rod does not need to be bent, and punching is not needed after forging; the bent connecting arm does not need to be roll forged and does not need to be punched after forging. The forging piece prepared by the method has the advantages of high strength, good toughness and corrosion resistance, and can meet the requirements of high strength, high toughness and corrosion resistance of the automobile chassis when being applied to the automobile chassis.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.