Integrated rear auxiliary frame and casting method thereof

Abstract

The invention discloses an integrated rear auxiliary frame and a casting method thereof. The integrated rear auxiliary frame comprises a front cross beam. A rear cross member; and a side beam; two first mounting holes are formed in the top of the front cross beam, driving shaft holes and second mounting holes are formed in the side beams, and the two ends of the front cross beam and the two ends of the rear cross beam extend outwards and are connected with a front fixing part and a rear fixing part correspondingly; a first installation assembly, a second installation assembly, a third installation assembly and a fourth installation assembly are arranged between the front fixing part and the rear fixing part on the side beam, the first installation assembly is connected to the second installation assembly, the third installation assembly is located above the driving shaft hole, and the fourth installation assembly is located below the driving shaft hole and close to the rear fixing part. The casting method is simple in step, the casting machining quality of the rear auxiliary frame can be improved, the fluorescent flaw detection precision of the rear auxiliary frame casting can be improved, the labor intensity of manual detection is reduced, and the production quality of the rear auxiliary frame is improved.

Description

Technical Field

[0001] The invention relates to an integrated rear auxiliary frame and a casting method thereof. Background Art

[0002] The rear subframe is the skeleton of the rear axle and an important component of the rear axle.

[0003] The main function of the rear subframe is to reduce the impact of road vibration on the vehicle body and increase the connection stiffness of the suspension system, thereby improving the comfort and stability of the vehicle during driving.

[0004] The rear subframe of the prior art has poor stability and has certain safety hazards. At the same time, the rear subframe needs manual inspection during the casting process, which not only has low inspection accuracy, but also increases the labor intensity of manual operation and reduces the quality of the product. Summary of the invention

[0005] The purpose of the present invention is to provide a technical solution for an integrated rear subframe and a casting method thereof in view of the deficiencies in the prior art, which can not only improve the stability and reliability of the installation of the rear subframe, but also improve the safety of the installation of the whole vehicle and extend the service life. The casting method has simple steps, which can not only improve the casting processing quality of the rear subframe, but also improve the fluorescent flaw detection accuracy of the rear subframe casting, reduce the labor intensity of manual inspection, and improve the production quality of the rear subframe.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] One-piece rear subframe, including

[0008] front crossbar;

[0009] rear cross member;

[0010] and side members, the front cross member being connected to the rear cross member through the side members to form a closed structure;

[0011] Features:

[0012] Two first mounting holes are provided on the top of the front cross beam, and a drive shaft hole and a second mounting hole are provided on the side beam. Both ends of the front cross beam and the rear cross beam extend outward and are respectively connected with a front fixing portion and a rear fixing portion. A first mounting assembly, a second mounting assembly, a third mounting assembly and a fourth mounting assembly are provided on the side beam between the front fixing portion and the rear fixing portion. The first mounting assembly is connected to the second mounting assembly, the third mounting assembly is located above the drive shaft hole, and the fourth mounting assembly is located below the drive shaft hole and close to the rear fixing portion. Through the design of the above structure, not only the stability and reliability of the installation of the rear subframe can be improved, but also the safety of the installation of the whole vehicle is improved and the service life is extended.

[0013] Furthermore, the interiors of the front cross beam, the rear cross beam and the side beams are all hollow structures, which facilitates reducing the overall weight of the rear subframe without affecting the mass of the rear subframe.

[0014] Furthermore, through holes are provided inside the front fixing part and the rear fixing part, and reinforcing ribs are provided on the outer sides of the front fixing part and the rear fixing part to facilitate the fixed installation between the rear subframe and the vehicle body. The reinforcing ribs improve the strength and stability of the front fixing part and the rear fixing part.

[0015] Furthermore, the first mounting assembly includes two first mounting plates arranged parallel to each other, the first mounting plates are provided with first fixing holes, and the first mounting plates are close to the front fixing portion and are used for installation and disassembly of components.

[0016] Furthermore, the second mounting assembly includes two second mounting plates arranged parallel to each other, the second mounting plates are provided with second fixing holes, the second mounting plates are connected to the first mounting plate, and are located below the first mounting plate for installation and disassembly of parts.

[0017] Furthermore, the third mounting assembly includes two third mounting plates arranged parallel to each other, and the third mounting plates are provided with third fixing holes for installation and disassembly of parts.

[0018] Furthermore, the fourth mounting assembly includes two fourth mounting plates arranged parallel to each other, and the fourth mounting plates are provided with fourth fixing holes for installation and disassembly of parts.

[0019] The casting method of the integrated rear subframe as described above is characterized by comprising the following steps:

[0020] S1, Sand core making

[0021] Determine the size of the sand core according to the design size of the rear subframe and make the corresponding sand core;

[0022] S2. Melting and degassing

[0023] a. Prepare aluminum alloy and heat it in a melting furnace to melt it;

[0024] b. Then adjust the temperature of the aluminum liquid to 750℃~780℃ for modification;

[0025] c. Then adjust the temperature of the aluminum liquid to 700℃~730℃ for refining treatment;

[0026] d. Finally, the slag is skimmed and the aluminum alloy liquid is transferred to the low-pressure casting machine insulation furnace. The temperature of the aluminum alloy liquid is adjusted to 680℃~700℃ for pouring. At the same time, the waste gas generated during the smelting process is discharged;

[0027] S3, low pressure casting

[0028] a. Set the low-pressure casting process parameters, the liquid rising pressure is 0.03-0.05MPa, the liquid rising rate is 30-60mm / s, the filling pressure is 0.06-0.08MPa, the filling rate is 50-70mm / s, the holding pressure is 0.12-0.16MPa, the holding time is 15-30s, and the pressure is released;

[0029] b. Complete the entire pouring process of liquid raising, mold filling, pressure maintaining and pressure relief, open the mold and take out the casting;

[0030] S4, Fluorescent flaw detection

[0031] a. First, the rear sub-frame casting is hung on the clamping mechanism in turn, and the driving mechanism is controlled by the touch screen on the box to drive the lifting mechanism to move, so that the rear sub-frame casting is placed in the cleaning tank of the box. The cleaning tank is provided with a heating plate and a brush, and the brush is connected to a servo motor. The servo motor drives the brush to rotate to remove the oil and rust on the surface of the rear sub-frame casting;

[0032] b. Then the clamping mechanism is driven to rise by the lifting mechanism, and the hot air drying mechanism is started during the rising process, so that the moisture on the surface of the rear subframe casting is evaporated by the hot air drying mechanism;

[0033] c. Then, the driving mechanism drives the lifting mechanism to move horizontally, so that the clamping mechanism drives the rear sub-frame casting to move above the immersion tank of the box body, and the rear sub-frame casting is lowered into the immersion tank through the lifting mechanism and the clamping mechanism to immerse the rear sub-frame casting in the fluorescent liquid;

[0034] d. After the soaking is completed, the clamping mechanism is driven to rise by the lifting mechanism, and the hot air drying mechanism is started during the rising process. The fluorescent liquid on the surface of the rear subframe casting is first washed through the water outlet on the hot air drying mechanism, and then the developer is sprayed on the surface of the rear subframe casting by the hot air drying mechanism, and then low-temperature drying is performed;

[0035] e. Finally, the driving mechanism drives the lifting mechanism to move horizontally, so that the clamping mechanism drives the rear subframe casting to move into the fluorescent flaw detection slot of the box body, turns on the fluorescent flaw detection lamp and camera, and displays the fluorescence emitted by the fluorescent liquid through the camera and the touch screen;

[0036] The fluorescent flaw detection process is simple, and can not only realize automatic cleaning, drying and fluorescent flaw detection of the rear subframe casting, but also greatly improve the efficiency of fluorescent flaw detection, reduce manual operation intensity, improve detection accuracy, and reduce the defective rate.

[0037] The clamping mechanism includes a horizontal rod, a column is provided parallel to the bottom of the horizontal rod, a first guide groove is provided on the column, a lifting rod is movably connected between two adjacent columns, the lifting rod is connected to the column through a first fastener, a second guide groove is provided on the lifting rod, and a second fastener is connected to the second guide groove; the lifting rod can move up and down along the column to adjust the distance between the two lifting rods, and the second fastener can move along the lifting rod to adjust the distance between the two second fasteners, thereby meeting the clamping requirements of rear subframes of different sizes and shapes, and greatly improving the efficiency of fluorescent flaw detection.

[0038] The hot air drying mechanism includes a hot air box and a blowing plate. The blowing plate is connected to the hot air box through a pipeline. The blowing plate is provided with an inclined surface. The inclined surface is provided with an air outlet and a water outlet. The water outlet is connected to an external water pipe. The hot air box conveys hot air to the blowing plate through the pipeline, and the air outlet is used to dry the rear subframe. The water outlet is used to rinse the rear subframe.

[0039] S5. Heat treatment

[0040] a. Place the rear subframe casting into aluminum alloy solution treatment equipment, heat to 550°C, keep warm for 5 to 8 hours, and put it into water within 1 minute, with the water temperature controlled at 80°C;

[0041] b. Cool the rear subframe casting after solution treatment to room temperature and keep it at room temperature for 5 hours;

[0042] c. Transfer to the aluminum alloy aging treatment equipment, the aging temperature is 150℃~180℃, the insulation time is 5~8h, take out and air cool;

[0043] S6. Polishing

[0044] The heat-treated rear subframe casting is ground by a grinding machine;

[0045] S7, X-ray inspection

[0046] The polished rear subframe casting is inspected using low-energy X-rays through an X-ray detector;

[0047] S8, cleaning and drying

[0048] The qualified rear subframes are cleaned, dried and packed.

[0049] The casting method has simple steps, can not only improve the casting processing quality of the rear subframe, but also improve the fluorescent flaw detection accuracy of the rear subframe casting, reduce the labor intensity of manual detection, and improve the production quality of the rear subframe.

[0050] Furthermore, the driving mechanism in step S4 process a includes a first motor, a first screw and a baffle, the first motor and the baffle are arranged on the side of the box body, the first motor is connected to the baffle through the first screw, the lifting mechanism is connected to the first screw, and the first motor drives the first screw to rotate, which can drive the lifting mechanism to move horizontally, thereby realizing horizontal transportation of the rear sub-frame.

[0051] Furthermore, the lifting mechanism in step S4 process a includes a lower bottom plate, an upper top plate, a movable plate, a slider and a booster block, the slider is connected to the lower bottom plate, a guide rail is provided on the side of the box body, the slider is connected to the slide rail, the booster block is arranged at the bottom of the slider, the booster block is connected to the first screw, the upper top plate is fixedly connected to the lower bottom plate by a guide rod, the movable plate is slidably connected to the guide rod, the lower bottom plate is provided with a second motor, the second motor is connected to a second screw, the second screw passes through the movable plate and is connected to the upper top plate, the second screw is driven to rotate by the second motor, and then the movable plate can be driven to move up and down, thereby meeting the height adjustment requirements of the rear sub-frame, and the guide rod improves the connection strength and stability between the lower bottom plate and the upper top plate.

[0052] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0053] 1. The present invention can not only improve the stability and reliability of the installation of the rear subframe, but also improve the safety of the installation of the whole vehicle and extend the service life.

[0054] 2. The fluorescent flaw detection process is simple, which can not only realize automatic cleaning, drying and fluorescent flaw detection of the rear subframe casting, but also greatly improve the efficiency of fluorescent flaw detection, reduce manual operation intensity, improve detection accuracy and reduce defective rate.

[0055] 3. The casting method of the present invention has simple steps, which can not only improve the casting processing quality of the rear subframe, but also improve the fluorescent flaw detection accuracy of the rear subframe casting, reduce the labor intensity of manual detection, and improve the production quality of the rear subframe. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The present invention will be further described below in conjunction with the accompanying drawings:

[0057] Figure 1 It is a structural schematic diagram of the integrated rear sub-frame and the rear sub-frame in the casting method thereof of the present invention;

[0058] Figure 2 for Figure 1 Structural schematic diagram of the middle A direction;

[0059] Figure 3 is a flow chart of the casting method of the present invention;

[0060] Figure 4 It is a structural schematic diagram of the fluorescent flaw detection equipment in the present invention;

[0061] Figure 5 for Figure 4 Schematic diagram of the structure in the B direction;

[0062] Figure 6 It is a structural schematic diagram of the clamping mechanism in the present invention;

[0063] Figure 7 This is a schematic diagram of the installation of the blowing plate in the present invention;

[0064] Figure 8 This is a schematic diagram of the installation of the fluorescent flaw detection lamp and camera in the present invention.

[0065] In the figure: 1-front crossbeam; 2-rear crossbeam; 3-side beam; 4-first mounting hole; 5-second mounting hole; 6-drive shaft hole; 7-front fixing part; 8-rear fixing part; 9-first mounting plate; 10-first fixing hole; 11-second mounting plate; 12-second fixing hole; 13-third mounting plate; 14-third fixing hole; 15-fourth mounting plate; 16-fourth fixing hole; 17-reinforcement rib; 18-through hole; 19-box; 20-touch screen; 21-cleaning tank; 22-immersion tank; 23-fluorescent flaw detection tank; 24-lifting mechanism; 25-clamping mechanism; 26-first liquid inlet pipe; 27-first liquid outlet pipe; 28-second Liquid inlet pipe; 29-second liquid outlet pipe; 30-guide rail; 31-first motor; 32-first screw; 33-baffle; 34-slider; 35-boost block; 36-lower bottom plate; 37-upper top plate; 38-moving plate; 39-second motor; 40-second screw; 41-guide rod; 42-hot air box; 43-horizontal rod; 44-column; 45-first guide groove; 46-first fastener; 47-lifting rod; 48-second guide groove; 49-second fastener; 50-fixed plate; 51-blowing plate; 52-inclined surface; 53-air outlet; 54-side plate; 55-fluorescent flaw detection lamp; 56-camera; 57-water outlet. DETAILED DESCRIPTION

[0066] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0067] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0068] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0069] like Figure 1 to Figure 2 As shown, the integrated rear subframe of the present invention includes a front crossbeam 1, a rear crossbeam 2 and a side beam 3. The front crossbeam 1 is connected to the rear crossbeam 2 through the side beam 3 to form a closed structure. The interiors of the front crossbeam 1, the rear crossbeam 2 and the side beam 3 are all hollow structures, which is convenient for reducing the overall weight of the rear subframe without affecting the mass of the rear subframe.

[0070] Through holes 18 are provided inside the front fixing portion 7 and the rear fixing portion 8, and reinforcing ribs 17 are provided on the outer sides of the front fixing portion 7 and the rear fixing portion 8 to facilitate the fixed installation between the rear subframe and the vehicle body. The reinforcing ribs 17 improve the strength and stability of the front fixing portion 7 and the rear fixing portion 8.

[0071] Two first mounting holes 4 are provided at the top of the front cross beam 1, and a drive shaft hole 6 and a second mounting hole 5 are provided at the side beam 3. Both ends of the front cross beam 1 and the rear cross beam 2 extend outward and are respectively connected with a front fixing portion 7 and a rear fixing portion 8. A first mounting component, a second mounting component, a third mounting component and a fourth mounting component are provided on the side beam 3 between the front fixing portion 7 and the rear fixing portion 8.

[0072] The first mounting assembly is connected to the second mounting assembly, and the first mounting assembly includes two first mounting plates 9 arranged in parallel with each other, the first mounting plates 9 are provided with first fixing holes 10, and the first mounting plates 9 are close to the front fixing portion 7, and are used for the installation and removal of parts. The second mounting assembly includes two second mounting plates 11 arranged in parallel with each other, the second mounting plates 11 are provided with second fixing holes 12, and the second mounting plates 11 are connected to the first mounting plates 9 and are located below the first mounting plates 9, and are used for the installation and removal of parts.

[0073] The third mounting assembly is located above the drive shaft hole 6. The third mounting assembly includes two third mounting plates 13 arranged parallel to each other. The third mounting plates 13 are provided with third fixing holes 14 for installation and removal of parts.

[0074] The fourth mounting assembly is located below the drive shaft hole 6 and close to the rear fixing portion 8. The fourth mounting assembly includes two fourth mounting plates 15 arranged parallel to each other. The fourth mounting plates 15 are provided with fourth fixing holes 16 for mounting and dismounting parts. The above structural design not only improves the stability and reliability of the rear subframe installation, but also improves the safety of the vehicle installation and prolongs the service life.

[0075] like Figures 3 to 8As shown, a casting method of an integrated rear subframe is disclosed, comprising the following steps:

[0076] S1, Sand core making

[0077] Determine the size of the sand core according to the design size of the rear subframe and make the corresponding sand core;

[0078] S2. Melting and degassing

[0079] a. Prepare aluminum alloy and heat it in a melting furnace to melt it;

[0080] b. Then adjust the temperature of the aluminum liquid to 750℃~780℃ for modification;

[0081] c. Then adjust the temperature of the aluminum liquid to 700℃~730℃ for refining treatment;

[0082] d. Finally, the slag is skimmed and the aluminum alloy liquid is transferred to the low-pressure casting machine insulation furnace. The temperature of the aluminum alloy liquid is adjusted to 680℃~700℃ for pouring. At the same time, the waste gas generated during the smelting process is discharged;

[0083] S3, low pressure casting

[0084] a. Set the low-pressure casting process parameters, the liquid rising pressure is 0.03-0.05MPa, the liquid rising rate is 30-60mm / s, the filling pressure is 0.06-0.08MPa, the filling rate is 50-70mm / s, the holding pressure is 0.12-0.16MPa, the holding time is 15-30s, and the pressure is released;

[0085] b. Complete the entire pouring process of liquid raising, mold filling, pressure maintaining and pressure relief, open the mold and take out the casting;

[0086] S4, Fluorescent flaw detection

[0087] a. First, the rear sub-frame casting is sequentially suspended on the clamping mechanism 25, and the touch screen 20 on the box 19 controls the driving mechanism to drive the lifting mechanism 24 to move, so that the rear sub-frame casting is lowered into the cleaning tank 21 of the box 19. The cleaning tank 21 is provided with a heating plate and a brush, and the brush is connected to a servo motor. The servo motor drives the brush to rotate to remove oil and rust spots on the surface of the rear sub-frame casting;

[0088] The clamping mechanism 25 includes a horizontal rod 43, a column 44 is provided parallel to the bottom of the horizontal rod 43, a first guide groove 45 is provided on the column 44, a lifting rod 47 is movably connected between two adjacent columns 44, the lifting rod 47 is connected to the column 44 through a first fastener 46, a second guide groove 48 is provided on the lifting rod 47, and a second fastener 49 is connected to the second guide groove 48; the lifting rod 47 can move up and down along the column 44 to adjust the distance between the two lifting rods 47, and the second fastener 49 can move along the lifting rod 47 to adjust the distance between the two second fasteners 49, so as to meet the clamping requirements of rear subframes of different sizes and shapes, and greatly improve the efficiency of fluorescent flaw detection.

[0089] The hot air drying mechanism includes a hot air box 42 and a blowing plate 51, the blowing plate 51 is connected to the hot air box 42 through a pipeline, an inclined surface 52 is provided on the blowing plate 51, the inclined surface 52 is provided with an air outlet 53 and a water outlet 57, and the water outlet 57 is connected to an external water pipe; the hot air box 42 delivers hot air to the blowing plate 51 through the pipeline, and the air outlet 53 dries the rear subframe, and the water outlet 57 is used to rinse the rear subframe. The blowing plate 51 is connected to the box body 19 through a fixing plate 50.

[0090] The driving mechanism includes a first motor 31, a first screw 32 and a baffle 33. The first motor 31 and the baffle 33 are arranged on the side of the box body 19. The first motor 31 is connected to the baffle 33 through the first screw 32. The lifting mechanism 24 is connected to the first screw 32. The first motor 31 drives the first screw 32 to rotate, and then the lifting mechanism 24 can be driven to move horizontally, thereby realizing horizontal transportation of the rear sub-frame.

[0091] The lifting mechanism 24 includes a lower bottom plate 36, an upper top plate 37, a movable plate 38, a slider 34 and a booster block 35. The slider 34 is connected to the lower bottom plate 36. A guide rail 30 is provided on the side of the box body 19. The slider 34 is connected to the slide rail. The booster block 35 is arranged at the bottom of the slider 34. The booster block 35 is connected to the first screw rod 32. The upper top plate 37 is fixedly connected to the lower bottom plate 36 by a guide rod 41. The movable plate 38 is slidably connected to the guide rod 41. The lower bottom plate 36 is provided with a second motor 39. The second motor 39 is connected to a second screw rod 40. The second screw rod 40 passes through the movable plate 38 and is connected to the upper top plate 37. The second motor 39 drives the second screw rod 40 to rotate, and then the movable plate 38 can be driven to move up and down to meet the height adjustment requirements of the rear sub-frame. The guide rod 41 improves the connection strength and stability between the lower bottom plate 36 and the upper top plate 37.

[0092] b. Then the clamping mechanism 25 is driven to rise by the lifting mechanism 24, and the hot air drying mechanism is started during the rising process to evaporate the moisture on the surface of the rear subframe casting by the hot air drying mechanism;

[0093] c. Then, the driving mechanism drives the lifting mechanism 24 to move horizontally, so that the clamping mechanism 25 drives the rear sub-frame casting to move above the immersion tank 22 of the box body 19, and the rear sub-frame casting is lowered into the immersion tank 22 through the lifting mechanism 24 and the clamping mechanism 25, and the rear sub-frame casting is immersed in the fluorescent liquid;

[0094] A first liquid inlet pipe 26, a first liquid outlet pipe 27, a second liquid inlet pipe 28 and a second liquid outlet pipe 29 are provided on the side of the box body 19. The first liquid inlet pipe 26 and the first liquid outlet pipe 27 are connected to the cleaning tank, and the second liquid inlet pipe 28 and the second liquid outlet pipe 29 are connected to the immersion tank.

[0095] d. After the soaking is completed, the clamping mechanism 25 is driven to rise by the lifting mechanism 24. During the rising process, the hot air drying mechanism is started. The fluorescent liquid on the surface of the rear subframe casting is firstly washed through the water outlet 57 on the hot air drying mechanism, and then the developer is sprayed on the surface of the rear subframe casting by the hot air drying mechanism, and then low-temperature drying is performed;

[0096] e. Finally, the driving mechanism drives the lifting mechanism 24 to move horizontally, so that the clamping mechanism 25 drives the rear subframe casting to move into the fluorescent flaw detection slot 23 of the box body 19, turns on the fluorescent flaw detection lamp 55 and the camera 56, and displays the fluorescence emitted by the fluorescent liquid through the camera 56 via the touch screen 20; a side panel 54 is provided in the fluorescent flaw detection slot 23, and the fluorescent flaw detection lamp 55 and the camera 56 are provided on the side panel 54.

[0097] The fluorescent flaw detection process is simple, and can not only realize automatic cleaning, drying and fluorescent flaw detection of the rear subframe casting, but also greatly improve the efficiency of fluorescent flaw detection, reduce manual operation intensity, improve detection accuracy, and reduce the defective rate.

[0098] S5. Heat treatment

[0099] a. Place the rear subframe casting into aluminum alloy solution treatment equipment, heat to 550°C, keep warm for 5 to 8 hours, and put it into water within 1 minute, with the water temperature controlled at 80°C;

[0100] b. Cool the rear subframe casting after solution treatment to room temperature and keep it at room temperature for 5 hours;

[0101] c. Transfer to the aluminum alloy aging treatment equipment, the aging temperature is 150℃~180℃, the insulation time is 5~8h, take out and air cool;

[0102] S6. Polishing

[0103] The heat-treated rear subframe casting is ground by a grinding machine;

[0104] S7, X-ray inspection

[0105] The polished rear subframe casting is inspected using low-energy X-rays through an X-ray detector;

[0106] S8, cleaning and drying

[0107] The qualified rear subframes are cleaned, dried and packed.

[0108] The casting method has simple steps, can not only improve the casting processing quality of the rear subframe, but also improve the fluorescent flaw detection accuracy of the rear subframe casting, reduce the labor intensity of manual detection, and improve the production quality of the rear subframe.

[0109] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. Integrated rear subframe, including front crossbar; rear cross member; and side beams, the front beam being connected to the rear beam through the side beams to form a closed structure; Features: The top of the front cross beam is provided with two first mounting holes, the side beam is provided with a drive shaft hole and a second mounting hole, the two ends of the front cross beam and the rear cross beam extend outward and are respectively connected with a front fixing part and a rear fixing part, and the side beam is provided with a first mounting component, a second mounting component, a third mounting component and a fourth mounting component between the front fixing part and the rear fixing part, the first mounting component is connected to the second mounting component, the third mounting component is located above the drive shaft hole, and the fourth mounting component is located below the drive shaft hole and close to the rear fixing part.

2. The integrated rear subframe according to claim 1, characterized in that: The interiors of the front cross beam, the rear cross beam and the side beams are all hollow structures.

3. The integrated rear subframe according to claim 1, characterized in that: Through holes are arranged inside the front fixing part and the rear fixing part, and reinforcing ribs are arranged on the outer sides of the front fixing part and the rear fixing part.

4. The integrated rear subframe according to claim 1, characterized in that: The first mounting assembly includes two first mounting plates arranged parallel to each other, the first mounting plates are provided with first fixing holes, and the first mounting plates are close to the front fixing portion.

5. The integrated rear subframe according to claim 4, characterized in that: The second mounting assembly includes two second mounting plates arranged parallel to each other. The second mounting plates are provided with second fixing holes. The second mounting plates are connected to the first mounting plate and are located below the first mounting plate.

6. The integrated rear subframe according to claim 1, characterized in that: The third mounting assembly includes two third mounting plates arranged parallel to each other, and the third mounting plates are provided with third fixing holes.

7. The integrated rear subframe according to claim 1, characterized in that: The fourth mounting assembly includes two fourth mounting plates arranged parallel to each other, and the fourth mounting plates are provided with fourth fixing holes.

8. The method for casting an integrated rear subframe according to any one of claims 1 to 7, characterized in that The following steps are involved: S1, Sand core making Determine the size of the sand core according to the design size of the rear subframe and make the corresponding sand core; S2. Melting and degassing a. Prepare aluminum alloy and heat it in a melting furnace to melt it; b. Then adjust the temperature of the aluminum liquid to 750℃~780℃ for modification; c. Then adjust the temperature of the aluminum liquid to 700℃~730℃ for refining treatment; d. Finally, the slag is skimmed and the aluminum alloy liquid is transferred to the low-pressure casting machine insulation furnace. The temperature of the aluminum alloy liquid is adjusted to 680℃~700℃ for pouring. At the same time, the waste gas generated during the smelting process is discharged; S3, low pressure casting a. Set the low-pressure casting process parameters, the liquid rising pressure is 0.03-0.05MPa, the liquid rising rate is 30-60mm / s, the filling pressure is 0.06-0.08MPa, the filling rate is 50-70mm / s, the holding pressure is 0.12-0.16MPa, the holding time is 15-30s, and the pressure is released; b. Complete the entire pouring process of liquid raising, mold filling, pressure maintaining and pressure relief, open the mold and take out the casting; S4, Fluorescent flaw detection a. First, the rear sub-frame casting is hung on the clamping mechanism in turn, and the driving mechanism is controlled by the touch screen on the box to drive the lifting mechanism to move, so that the rear sub-frame casting is placed in the cleaning tank of the box. The cleaning tank is provided with a heating plate and a brush, and the brush is connected to a servo motor. The servo motor drives the brush to rotate to remove the oil and rust on the surface of the rear sub-frame casting; b. Then the clamping mechanism is driven to rise by the lifting mechanism, and the hot air drying mechanism is started during the rising process, so that the moisture on the surface of the rear subframe casting is evaporated by the hot air drying mechanism; c. Then, the driving mechanism drives the lifting mechanism to move horizontally, so that the clamping mechanism drives the rear sub-frame casting to move above the immersion tank of the box body, and the rear sub-frame casting is lowered into the immersion tank through the lifting mechanism and the clamping mechanism to immerse the rear sub-frame casting in the fluorescent liquid; d. After the soaking is completed, the clamping mechanism is driven to rise by the lifting mechanism, and the hot air drying mechanism is started during the rising process. The fluorescent liquid on the surface of the rear subframe casting is first washed through the water outlet on the hot air drying mechanism, and then the developer is sprayed on the surface of the rear subframe casting by the hot air drying mechanism, and then low-temperature drying is performed; e. Finally, the driving mechanism drives the lifting mechanism to move horizontally, so that the clamping mechanism drives the rear subframe casting to move into the fluorescent flaw detection slot of the box body, turns on the fluorescent flaw detection lamp and camera, and displays the fluorescence emitted by the fluorescent liquid through the camera and the touch screen; The clamping mechanism comprises a horizontal rod, a column is parallelly arranged at the bottom of the horizontal rod, a first guide slot is arranged on the column, a lifting rod is movably connected between two adjacent columns, the lifting rod is connected to the column through a first fastener, a second guide slot is arranged on the lifting rod, and a second fastener is connected to the second guide slot; The hot air drying mechanism comprises a hot air box and a blowing plate, wherein the blowing plate is connected to the hot air box through a pipeline, an inclined surface is provided on the blowing plate, and an air outlet and a water outlet are provided on the inclined surface, and the water outlet is connected to an external water pipe; S5. Heat treatment a. Place the rear subframe casting into aluminum alloy solution treatment equipment, heat to 550°C, keep warm for 5 to 8 hours, and put it into water within 1 minute, with the water temperature controlled at 80°C; b. Cool the rear subframe casting after solution treatment to room temperature and keep it at room temperature for 5 hours; c. Transfer to the aluminum alloy aging treatment equipment, the aging temperature is 150℃~180℃, the insulation time is 5~8h, take out and air cool; S6. Polishing The heat-treated rear subframe casting is ground by a grinding machine; S7, X-ray inspection The polished rear subframe casting is inspected using low-energy X-rays through an X-ray detector; S8, cleaning and drying The qualified rear subframes are cleaned, dried and packed.

9. The casting method of the integrated rear subframe according to claim 8, characterized in that: The driving mechanism in step S4 process a includes a first motor, a first screw and a baffle, wherein the first motor and the baffle are arranged on the side of the box body, the first motor is connected to the baffle through a first screw, and the lifting mechanism is connected to the first screw.

10. The casting method of the integrated rear subframe according to claim 9, characterized in that: The lifting mechanism in step S4 process a includes a lower bottom plate, an upper top plate, a movable plate, a slider and a booster block, the slider is connected to the lower bottom plate, a guide rail is provided on the side of the box body, the slider is connected to the slide rail, the booster block is provided at the bottom of the slider, the booster block is connected to the first screw, the upper top plate is fixedly connected to the lower bottom plate through a guide rod, the movable plate is slidably connected to the guide rod, the lower bottom plate is provided with a second motor, the second motor is connected to a second screw, and the second screw passes through the movable plate and is connected to the upper top plate.

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