Production line suitable for heat-treatment-free vehicle body structural parts

Abstract

The utility model relates to a die-casting process and production line suitable for a heat-treatment-free vehicle body structural member, which comprises a die-casting device, a die-casting peripheral device and a casting post-processing device, the die-casting device is used for a die-casting process of the vehicle body structural member, and the die-casting peripheral device is used for a peripheral processing process of the vehicle body structural member. The post-casting treatment device is used for the post-casting detection and transfer procedure of the vehicle body structural part. The die-casting device is used for carrying out die-casting work on a heat-treatment-free alloy material, after a part is formed through die-casting, the die-casting peripheral device is used for transferring a product, detecting, cooling, branch removing and marking are carried out, finally, the product is transferred for the second time through the after-casting treatment device, and edge cutting, deburring, secondary detecting, basketing and stacking are carried out. Therefore, automation of the whole product from casting to finished product stacking can be achieved, and the productivity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of die-casting technology, and in particular to a production line suitable for heat-treatment-free vehicle body structural parts. Background Art

[0002] Die casting is a casting process in which the molten and degassed alloy liquid is poured into the pressure chamber cavity, and the injection punch is pushed along the axis of the injection chamber by the action of the injection rod of the die casting machine to inject the alloy liquid into the mold cavity at low speed and low pressure, and then at high speed and high pressure. It is particularly suitable for the production of products with complex shapes, high integration and lightweight, such as front cabins, rear floors, shock towers, longitudinal beams, etc. of vehicle body structural parts.

[0003] The traditional die-casting process for producing such body structural parts requires T6 or T7 heat treatment, which will cause product deformation and increase manufacturing processes and production costs. With the emergence of alloy materials that do not require heat treatment, traditional production processes and production lines are no longer suitable for the production requirements of such body structural parts that do not require heat treatment. There is an urgent need for a casting process and casting production line suitable for the production of body structural parts that do not require heat treatment. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a production line capable of die-casting vehicle body structural parts without heat treatment.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a production line suitable for heat-treatment-free vehicle body structural parts, comprising a die-casting device, a die-casting peripheral device and a post-casting processing device, wherein the die-casting device is used in the die-casting process of the vehicle body structural parts, the die-casting peripheral device is used in the peripheral processing process of the vehicle body structural parts, and the post-casting processing device is used in the post-casting inspection and transportation process of the vehicle body structural parts;

[0006] After the die-casting device produces the product casting, the product casting is grabbed by the picking robot and sent to the die-casting peripheral device;

[0007] The die-casting peripheral device performs photoelectric detection, cooling, debranching, marking and trimming on the product castings in sequence, and the product castings are transferred to the post-casting processing device through the handling device;

[0008] The post-casting processing device grinds, detects deformation, baskets and stacks the product castings in sequence.

[0009] The beneficial effects of the utility model are as follows: a die-casting device is used to die-cast alloy materials that do not require heat treatment; after the die-cast parts are formed, the die-casting peripheral devices are used to transport the products, and they are tested, cooled, debranched and marked; finally, the products are transported for a second time through a post-casting processing device, and trimming, deburring, secondary testing, basket loading and palletizing are performed, so that the entire product from casting to finished product palletizing can be automated, thereby improving production capacity.

[0010] Furthermore, it also includes a waste transportation line, wherein the feeding end of the waste transportation line is close to the die-casting device, and the discharging end is close to the waste stacking area, and the waste stacking area is provided with a waste trolley for transporting waste.

[0011] Furthermore, it also includes a waste chute, which is arranged in the waste stacking area, and the waste trolley is used to transport the waste to the waste chute.

[0012] The above technical solution, by providing a scrap chute, can automatically transfer and recycle defective castings by transporting the scrap trolley 15 when defective products appear.

[0013] The above technical solution sets up a scrap transport line so that defective products can be separated and transported out in time through the scrap transport line when they are produced, so that subsequent scrap carts can transfer the defective product castings.

[0014] Furthermore, it also includes a power distribution cabinet, which is used for power distribution of the die-casting device, die-casting peripheral devices and post-casting processing devices.

[0015] Furthermore, the transport device is a transport robot.

[0016] The above technical solution provides power to the handling robot by setting up a handling robot and a handling robot electric box. The handling robot electric box can carry finished castings and defective castings separately, thereby improving the automation capacity of the entire production line.

[0017] Furthermore, it also includes a sampling conveyor line, the feed port of the sampling conveyor line is close to the die-casting peripheral device, the discharge port of the sampling conveyor line is close to the emergency reflux line, and the product castings are conveyed to the finished product area, the die-casting device, the die-casting peripheral device or the post-casting processing device through the emergency reflux line.

[0018] The above technical solution reduces labor costs and improves the efficiency of random inspection by setting up a random inspection conveyor line and using the random inspection conveyor line to convey sample castings that need to be sampled and inspected.

[0019] Furthermore, the emergency reflow line has a feed port close to a discharge port of the sampling conveying line, and a discharge port of the emergency reflow line close to the finished product area, the die-casting device, the die-casting peripheral device or the post-casting processing device.

[0020] The above technical solution sets up an emergency return line, so that when the entire device fails in the production line, it can promptly transfer defective product castings to the die-casting device, die-casting peripheral device or post-casting processing device.

[0021] Furthermore, it also includes a cache station, which is provided with a placement stand. The cache station is close to the discharge port of the emergency return line and is used for temporarily storing product castings when the emergency return line fails.

[0022] The above technical solution sets up a cache station. During post-casting processing, if the production capacity of the production line is too large, the product is blocked or the emergency return line cannot transport the product to the finished product area, die-casting equipment, die-casting peripheral equipment or post-casting processing equipment in time, the product castings can be temporarily stored in the cache station.

[0023] Furthermore, it also includes an AGV trolley, which is used to transfer qualified product castings in the finished product area.

[0024] The above technical solution reduces the trouble of manual handling and further improves production efficiency by setting up an AGV cart.

[0025] Furthermore, it also includes a plurality of groups of lighting lamps, which are arranged on the die-casting device, the die-casting peripheral device and the post-casting processing device.

[0026] The above technical solution improves the convenience of nighttime production of the device by providing lighting.

[0027] The second purpose of the utility model is to provide a die-casting process for vehicle body structural parts using alloy materials that do not require heat treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the production line structure in an embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the spray robot in the embodiment of the utility model;

[0030] Figure 3 It is a schematic diagram of the vacuum valve structure in the embodiment of the utility model.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1. Die casting machine; 2. Electric box; 3. Operating platform; 4. Operating panel; 5. Dosing furnace; 6. Pick-up robot; 7. Handling robot; 8. Spray robot; 9. Pick-up robot electric box; 10. Handling robot electric box; 11. Spray robot electric box; 12. Product testing station; 13. Cooling water tank; 14. Trimming machine; 15. Scrap trolley; 16. Marking machine; 17. Scrap conveyor line; 18. Emergency return line; 19. Scrap slide; 20. Three-sheet head conveyor line ; 21. Safety fence; 22. Pressurized conveyor; 23. Gas storage tank; 24. Vacuum machine; 25. Mold temperature controller; 26. Chiller; 27. Mold cold spot cooling integrated machine; 28. Mold temperature control system; 29. ​​Core pulling energy storage device; 30. Power distribution cabinet; 31. Manual emergency station; 32. Deburring station; 33. Blue light inspection station; 34. Basket loading robot assembly; 35. Truss linear guide assembly; 36. Palletizing frame; 37. Partition frame; 38. Cache station; 39. Random inspection conveyor line. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] Example

[0035] like Figure 1-3 As shown, a production line suitable for heat-treatment-free vehicle body structural parts includes a die-casting device, a die-casting peripheral device and a post-casting processing device. The die-casting device is used in the die-casting process of the vehicle body structural parts, the die-casting peripheral device is used in the peripheral processing process of the vehicle body structural parts, and the post-casting processing device is used in the post-casting inspection and transportation process of the vehicle body structural parts;

[0036] After the die-casting device produces the product casting, the product casting is grabbed by the pickup robot 6 and sent to the die-casting peripheral device;

[0037] The die-casting peripheral device performs photoelectric detection, cooling, debranching, marking and trimming on the product castings in sequence, and transfers the product castings to the post-casting processing device through the handling device;

[0038] The die-casting device is composed of existing equipment, generally including a die-casting machine 1, an electrical box 2, an operating platform 3, an operating panel 4, a quantitative furnace 5, a spray robot 8, a spray robot electrical box 11, a pressure conveyor 22, a gas storage tank 23, a vacuum machine 24, a mold temperature controller 25, a water chiller 26, a mold cold spot cooling integrated machine 27, a mold temperature control system 28 and a core-pulling energy storage device 29. The above devices cooperate with each other to achieve the die-casting of heat-free alloy materials.

[0039] The picking robot also includes an electrical box 9 , and the picking robot 6 is electrically connected to the electrical box 9 .

[0040] Among them, the die-casting peripheral devices are all existing equipment, generally including, product inspection station 12, cooling water tank 13, delimbing machine, three-plate head conveyor line 20, marking machine 16, and the above devices cooperate with each other to realize the preliminary peripheral processing of the die-cast products;

[0041] The post-casting processing device contains existing equipment, generally including a trimmer 14, a deburring station 32, a blue light detection station 33, a basket loading robot assembly 34, a truss linear guide assembly 35, a stacking frame 36, and a partition frame 37, so as to realize fully automatic production from aluminum liquid quantitative measurement to finished product off-line;

[0042] It also includes a safety fence 21, which is arranged around the outer periphery of the die-casting device, the die-casting peripheral device and the post-casting processing device.

[0043] Production line workflow: After the product is successfully die-casted by the die-casting machine, the pick-up robot 6 grabs the casting and sends it to the product inspection station 12 for photoelectric inspection. After the inspection, the product is water-cooled using the cooling water tank 13. After cooling, the product is debranched using the debranching machine. After debranching, the product is coded and placed using the marking machine 16. After placing, the handling robot 7 picks up the product from the coding workbench and sends it to the trimming machine 14 for trimming. After trimming, the handling robot transfers the product to the coding workbench. The machine in the deburring station 32 People grab the products, clean and polish them, and after cleaning and polishing, the products are transferred to the blue light inspection station 33. The robot in the blue light inspection station 33 grabs the blue light scanning head inside the blue light inspection station 33 to detect the deformation of the products. After the detection is completed, the basket loading robot 34 assembly grabs the castings from the blue light inspection station 33, and loads them into the corresponding pallets according to whether they are qualified and the left and right parts. After one layer of the pallet is full, the truss linear guide assembly 35 grabs the pallet and stacks it at the stacking frame 36. After the basket loading and stacking is completed, it is transported by the AGV cart.

[0044] The die-casting device is used to die-cast the alloy materials that do not require heat treatment. After the die-cast parts are formed, the die-casting peripheral devices are used to transfer the products, and they are tested, cooled, debranched and marked. Finally, the products are transferred for the second time through the post-casting processing device, and trimming, deburring, secondary testing, basket loading and palletizing are carried out, so that the entire product from casting to finished product palletizing can be automated, thereby improving production capacity.

[0045] Preferably, it further comprises a waste transport line 17, wherein the feed end of the waste transport line 17 is close to the die-casting device, and the discharge end is close to the waste stacking area, and the waste stacking area is provided with a waste trolley 15 for transporting waste.

[0046] The above technical solution sets up a waste transport line 17 so that defective products can be separated and transported out in time through the waste transport line 17 when they are produced, so that the subsequent waste trolley 15 can transfer the defective product castings.

[0047] Preferably, it also includes a waste chute 19, which is arranged on one side of the die-casting peripheral device and connected thereto, and is used to recycle defective product castings in the die-casting peripheral device.

[0048] Among them, the waste chute 19 is arranged inclined.

[0049] The above technical solution sets up a scrap chute 19. When defective products appear, the product castings can be placed at the high point of the scrap chute 19 under the transportation of the scrap trolley 15. The product castings are automatically stacked in the scrap chute 19 under their own gravity, thereby realizing the automatic transfer and recovery of defective product castings.

[0050] Preferably, it further comprises a power distribution cabinet 30, which is used for power distribution of the die casting device, die casting peripheral devices and post-casting processing devices.

[0051] The power distribution cabinet 30 is electrically connected to various electrical devices inside the die-casting device, die-casting peripheral devices and post-casting processing device.

[0052] Preferably, the transport device is a transport robot 7 .

[0053] Preferably, it also includes a sampling conveyor line 39, the feed port of the sampling conveyor line 39 is close to the die-casting peripheral device, the discharge port of the sampling conveyor line 39 is close to the emergency return line, and the product castings are transported to the finished product area, the die-casting device, the die-casting peripheral device or the post-casting processing device through the emergency return line 18.

[0054] The above technical solution reduces labor costs and improves the efficiency of random inspection by setting up a random inspection conveyor line 39 and using the random inspection conveyor line 39 to convey sample castings that need to be sampled and inspected.

[0055] Preferably, the emergency return line 18, the feed port of the emergency return line 18 is close to the discharge port of the sampling conveying line 39, and the discharge port of the emergency return line 18 is close to the finished product area, the die-casting device, the die-casting peripheral device or the post-casting processing device.

[0056] The above technical solution provides an emergency return line 18 so that when a production line failure occurs, the entire device can promptly transfer defective product castings to the die-casting device, die-casting peripheral device or post-casting processing device.

[0057] Preferably, a buffer station 38 is further included, wherein the buffer station 38 is provided with a placement stand and is close to the discharge port of the emergency return line 18 for temporarily storing product castings when the emergency return line 18 fails.

[0058] The above technical solution sets up a buffer station. During post-casting processing, if the production capacity of the production line is too large, the product is blocked or the emergency return line 18 is unable to transport the product to the finished product area, the die-casting device, the die-casting peripheral device or the post-casting processing device, the product castings can be temporarily stored in the buffer station 38.

[0059] Preferably, it also includes an AGV trolley, which is used to transfer qualified product castings in the finished product area.

[0060] The above technical solution reduces the trouble of manual handling and further improves production efficiency by setting up an AGV cart.

[0061] Preferably, it also includes a plurality of groups of lighting lamps, which are arranged on the die-casting device, the die-casting peripheral device and the post-casting processing device.

[0062] The above technical solution improves the convenience of nighttime production by providing lighting.

[0063] A die-casting process for heat-treatment-free vehicle body structural parts comprises the following steps:

[0064] Step 1: Mix and proportion to prepare alloy materials;

[0065] Step 2: using a gas melting furnace to melt the alloy material at a temperature of 780°C to obtain a refined alloy material, wherein a slag removal and degassing agent is added during smelting, the time for adding the slag removal and degassing agent is 2 to 3 minutes, the time for blowing nitrogen is 3 to 5 minutes, the pressure of the nitrogen bottle is >5Mpa, rare earth alloy is added, and after standing for 10-15 minutes, the outlet water temperature of the aluminum liquid is ensured to be ≥760°C;

[0066] Step 3: Degassing the refined alloy material to obtain a degassed alloy material, wherein the degassing time is 6-10 min, wherein the degassing argon gas flow rate is 17-25 L / min, the degassing argon gas bottle pressure is > 2 MPa, the rotor stirring piece solubility is less than 1 / 2, the baffle solubility is less than 1 / 3, the aluminum liquid outlet temperature is ≥ 720°C, and the alloy liquid gas content Di < 2%;

[0067] Step 4: Add 0.008-0.030% AlSr10 modifier to the degassed alloy material, stir for 3-5 minutes, and let stand for 8-10 minutes to obtain a heat-treatment-free alloy liquid;

[0068] Step 5: Transfer the heat-treatment-free alloy liquid to the quantitative furnace 5, and set the temperature in the quantitative furnace 5 to 700-710° C.;

[0069] Step 6: Open the mold and use a small amount of oily stock solution for pulse-type spraying. The use of a small amount of oily stock solution for spraying speeds up the rhythm of the oily stock solution and makes the spraying more efficient.

[0070] Step 7: Preheat the mold. The preheating temperature of the mold near the gate is 120-150°C, and the preheating temperature of the mold far from the gate is 150-200°C. The area between the center of the mold cavity and the mold gate is the proximal area, and the area of ​​the mold cavity excluding the proximal area is the distal area. The preheating temperature of the mold pressure chamber is 100-120°C.

[0071] Step 8: Clamp the preheated mold. After the mold is closed, start the quantitative furnace to feed soup signal. When closing the mold, first close the mold at high speed and then close the mold at low speed. After the mold is closed, start the quantitative furnace to feed soup signal. High-speed mold closing can ensure its mold closing efficiency, and then switch to low-speed mold closing to avoid damage to the mold due to large impact during mold closing.

[0072] Step 9: Close the inlet of the mold, adjust the vacuum degree of the mold cavity to ≤100mbar, and maintain it. Use vacuum valves A1, A2, B1, B2, C1 and C2 connected to the vacuum device to perform vacuum treatment until the vacuum degree of the mold cavity is ≤100mbar, and close the vacuum valves A1 and A2. A1, A2, B1 and B2 are vacuum hydraulic valves. C1 and C2 are wave plates with a pitch of 1mm. The wave plates and vacuum hydraulic valves are connected to the vacuum machine.

[0073] Step 10: Open the pouring port, inject the heat-treatment-free alloy liquid into the pressure chamber connected to the mold, and let it stand for 1-2 seconds after pouring. The casting temperature of the heat-treatment-free alloy liquid is 695-710°C;

[0074] Step 11: After the mold is filled, the punch is slowly ejected and passes over the mold inlet, and vacuum is drawn. The slow ejection speed is 0.2-0.5m / s. The vacuum drawing is as follows: until 50mm before the quick start, the vacuum valves B1 and B2 are closed. At this time, the vacuum valves C1 and C2 continue to vacuum until the cavity is filled. When the cavity is filled, the vacuum degree of the cavity is ≤50mbar.

[0075] Step 12: The punch of the mold moves, and the heat-treatment-free alloy liquid is quickly injected into the mold cavity to fill and form. The rapid injection speed is 5-6m / s, the injection pressure is 40-50Mpa, and the injection time is 40-60ms;

[0076] Step 13: Cool the casting filled in the mold cavity for 15-20 seconds;

[0077] Step 14: After cooling, the mold is opened and the workpiece is taken out to obtain a preliminary workpiece. The ejection process is to use the ejector inside the mold to pre-eject 30-50mm after the mold is opened. The take-out machine clamps the material cake and then ejects it 60-100mm. The take-out machine takes the product out of the mold;

[0078] Step 15: Perform peripheral processing on the preliminary workpiece to obtain a finished product.

[0079] Furthermore, the alloy material includes 7.5-8.8wt.% silicon, 0.05-0.15wt.% copper, 0.15-0.37wt.% magnesium, 0.35-0.85wt.% manganese, 0.08-0.18wt.% iron, 0.16-0.32wt.% zinc, 0.05-0.25wt.% titanium, 0.008-0.030wt.% strontium, 0.02-0.1wt.% vanadium, 0.1-0.25% of a mixture of lanthanum and cerium rare earth and aluminum.

[0080] The above technical solution adopts 7.5ˉ8.8wt.% of silicon to ensure the die-casting processability of the product while ensuring its excellent mechanical properties. Among them, the use of 0.008ˉ0.030wt.% of strontium element expands its range and avoids the frequent burning of strontium element due to too narrow a range, which is not conducive to the control of the smelting process.

[0081] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A production line suitable for heat-treatment-free vehicle body structural parts, characterized in that: It includes a die-casting device, a die-casting peripheral device and a post-casting processing device, wherein the die-casting device is used in the die-casting process of the vehicle body structure, the die-casting peripheral device is used in the peripheral processing process of the vehicle body structure, and the post-casting processing device is used in the post-casting inspection and transportation process of the vehicle body structure; After the die-casting device produces a product casting, the product casting is grabbed by a picking robot (6) and sent to a die-casting peripheral device; The die-casting peripheral device performs photoelectric detection, cooling, debranching, marking and trimming on the product castings in sequence, and transfers the product castings to the post-casting processing device through the handling device; The post-casting processing device grinds, detects deformation, baskets and stacks the product castings in sequence.

2. A production line suitable for heat treatment-free vehicle body structural parts according to claim 1, characterized in that: It also includes a waste transport line (17), wherein the feed end of the waste transport line (17) is close to the die-casting device, and the discharge end is close to the waste stacking area, and the waste stacking area is provided with a waste trolley (15) for transporting waste.

3. A production line suitable for heat treatment-free vehicle body structural parts according to claim 2, characterized in that: It also comprises a waste chute (19), wherein the waste chute (19) is arranged in the waste stacking area, and the waste trolley (15) is used to transfer the waste to the waste chute (19).

4. The production line for heat-treatment-free vehicle body structural parts according to claim 1, characterized in that: It also includes a power distribution cabinet (30), which is used for distributing power to the die casting device, die casting peripheral devices and post-casting processing devices.

5. The production line for heat-treatment-free vehicle body structural parts according to claim 1, characterized in that: The transport device comprises a transport robot (7).

6. The production line for heat-treatment-free vehicle body structural parts according to claim 1, characterized in that: It also includes a sampling conveyor line (39), wherein the feed port of the sampling conveyor line (39) is close to the die-casting peripheral device, and the discharge port of the sampling conveyor line (39) is close to the emergency return line, and the product castings are transported to the finished product area, the die-casting device, the die-casting peripheral device or the post-casting processing device through the emergency return line (18).

7. A production line suitable for heat treatment-free vehicle body structural parts according to claim 6, characterized in that: The emergency return line (18), the feed port of the emergency return line (18) is close to the discharge port of the sampling conveying line (39), and the discharge port of the emergency return line (18) is close to the finished product area, the die-casting device, the die-casting peripheral device or the post-casting processing device.

8. The production line for heat-treatment-free vehicle body structural parts according to claim 7, characterized in that: It also includes a buffer station (38), wherein the buffer station (38) is provided with a placement stand, and the buffer station (38) is close to the discharge port of the emergency return line (18), and is used to temporarily store product castings when the emergency return line (18) fails.

9. The production line for heat-treatment-free vehicle body structural parts according to claim 6, characterized in that: It also includes an AGV trolley, which is used to transfer qualified product castings in the finished product area.

10. The production line for heat-treatment-free vehicle body structural parts according to claim 1, characterized in that: It also includes a plurality of groups of lighting lamps, which are arranged on the die-casting device, the die-casting peripheral device and the post-casting processing device.

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