Forged structure of separator, forging method, and forging die

Abstract

Disclosed in the present invention are a forged structure of a separator, a forging method, and a forging die. The forged structure comprises: a body, wherein the body is approximately plate-shaped, four locating points are arranged on each of the upper surface and the lower surface of the body, any three locating points among the four locating points on the same surface form a plane, and the height difference between the remaining locating point and the plane is smaller than or equal to 1 mm; and cylindrical arched parts, wherein the axis of each cylindrical arched part is parallel to the plane where the body is located, the cylindrical arched parts protrude from the body in the thickness direction, and the portion of each cylindrical arched part protruding from the body is a smooth, arc-shaped surface. The forged structure of the present invention is fully formed, has small deformation, and is beneficial to subsequent machining operation.

Description

Forging structure, forging method and forging die of partition components Technical Field

[0001] This invention belongs to the field of forging technology, specifically relating to a forging structure, forging method and forging die of a partition component. Background Technology

[0002] New energy battery packs typically include partitions to increase their structural strength. Partitions manufactured using traditional machining methods suffer from significant raw material waste, and the smooth surfaces are difficult to machine. On the other hand, partitions manufactured using forging are more prone to deformation during the forging process because they are plate-shaped, which affects subsequent processing.

[0003] Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] Therefore, the present invention proposes a forging structure, forging method and forging die for a partition component, and the forging structure of the partition component has the following advantages.

[0006] According to an embodiment of the present invention, the forging structure of the partition member includes: a body, the body being generally plate-shaped, with four positioning points on both the upper and lower surfaces of the body, any three of the four positioning points on the same surface forming a plane, and the height difference between the remaining positioning point and the plane being ≤1mm; and a columnar arched portion, the axis of which is parallel to the plane of the body, the columnar arched portion protruding from the body along the thickness direction, and the portion of the columnar arched portion protruding from the body being a smooth arc surface.

[0007] According to one embodiment of the present invention, the radius of the rounded corners of the cylindrical arch and the side edge is ≤5mm.

[0008] According to one embodiment of the present invention, the machining allowance reserved on the side edge of the body is 1.8-2mm, and the draft angle of the side of the body is 3-8°.

[0009] According to one embodiment of the present invention, a tangential step surface is formed on the outer contour of the body, and the width of the tangential step surface is 1.8-3mm.

[0010] According to one embodiment of the present invention, there are two cylindrical arched portions, and an X-shaped reinforcing rib is provided on the main body, the X-shaped reinforcing rib being located between the two cylindrical arched portions.

[0011] According to one embodiment of the present invention, the thickness of the cylindrical arch is greater than 20 mm, and the thickness of the thinnest part of the body is between 3 mm and 4 mm.

[0012] According to one embodiment of the present invention, the body has a bending performance test area. The test is stopped when the test pressure reaches 30N. The actual bending angle of the bending performance test area is converted into the standard bending angle of a 2mm thickness. Then, the standard bending angle of a 2mm thickness is greater than or equal to 70°.

[0013] According to one embodiment of the present invention, the body is provided with a groove portion, the groove portion is located on the axis of the cylindrical arch portion, and the two sides of the groove portion protrude upward and downward to the upper and lower surfaces.

[0014] According to an embodiment of the present invention, a forging method for processing the above-mentioned forging structure includes the following steps: S1, designing a pre-forging die and a final forging die according to the forging structure; S2, blanking to obtain a billet; S3, heating the billet to the forging temperature; S4, performing pre-forging and final forging operations on the billet in sequence; S5, performing residual heat solution treatment; S6, removing flash; S7, performing artificial aging treatment; S8, performing surface treatment.

[0015] According to one embodiment of the present invention, in S4, the mold is first heated during the forging process, and then a layer of lubricating liquid is sprayed onto the surface of the mold cavity. When preparing the lubricating liquid, water-based lubricant and graphite lubricant are first mixed in a certain proportion to form a mixed lubricant. Then, the mixed lubricant is mixed with water to form a lubricating liquid, wherein the concentration of the mixed lubricant is not less than 10%.

[0016] According to one embodiment of the present invention, in the mixed lubricant, the water-based lubricant is 1-3 parts and the graphite lubricant is 2-4 parts.

[0017] According to one embodiment of the present invention, before forging begins, the mold is rapidly heated using a spray gun, and the mold is kept warm during the forging process to maintain the temperature of the mold cavity surface at 150-190°C. Lubricant needs to be evenly sprayed onto the mold cavity surface before each forging.

[0018] According to one embodiment of the present invention, the raw material selected is aluminum alloy 6082 bar stock, and the forging temperature is 510±10℃.

[0019] According to one embodiment of the present invention, in S4, the height of the pre-forged part formed by pre-forging is 1.5-2.5 mm higher than that of the final forging part formed by final forging.

[0020] According to one embodiment of the present invention, in S5, during the residual heat solution treatment, the plane of the final forging is perpendicular to the horizontal plane and enters the water. In S7, the temperature of the artificial aging treatment is 170°C and the time is 9 hours.

[0021] According to one embodiment of the present invention, the surface treatment is shot blasting, and the equipment used for shot blasting is a mesh belt shot blasting machine. The diameter of the shot used for shot blasting is 0.3-1.2mm, the power of the blasting head is 25-35Hz, the number of blasting heads is 6-10, the speed of the conveyor motor of the mesh belt is 8-15Hz, and the shot blasting times for both the front and back sides of the intermediate crossbeam forging are twice.

[0022] According to one embodiment of the present invention, a forging die is provided for forging the aforementioned forging structure. The die includes a lower die, the upper surface of which is provided with a pre-forging lower die cavity and a final forging lower die cavity spaced apart. The pre-forging lower die cavity has an arc-shaped positioning groove and a positioning end face in its center, spaced apart along the length of the pre-forging lower die cavity. The arc-shaped positioning groove supports and positions the side of the bar stock, and the positioning end face positions the end face of the bar stock. An upper die is also provided, the lower surface of which is provided with a pre-forging upper die cavity and a final forging upper die cavity spaced apart. The pre-forging upper die cavity corresponds to the pre-forging lower die cavity, and the final forging upper die cavity corresponds to the final forging lower die cavity. During forging, the final forging operation of the previous pre-forged part and the pre-forging operation of the subsequent billet are performed simultaneously to achieve continuous operation.

[0023] According to one embodiment of the present invention, both the lower mold and the upper mold have waist-shaped grooves on their sides, and a plurality of heating holes are spaced apart in the waist-shaped grooves. The heating holes are used to place heating rods, and the heating rods are used to keep the mold warm.

[0024] The beneficial effects of this invention are that the forging structure is easy to form, and the surface of the cylindrical arch protruding part is smooth without protrusions or burrs. On the one hand, this makes the partition part have higher safety performance when used in battery packs. On the other hand, it is easier to peel off from the cavity after forging, avoiding sticking to the mold, ensuring the processing effect, controlling the deformation of the partition part within a reasonable range, and the small deformation is conducive to positioning during cutting. Furthermore, the edge is fully formed, and the forming performance of the forging is significantly improved. This allows the cylindrical arch part to have enough material for hole processing, resulting in better filling effect and higher material utilization.

[0025] The forging method of this invention is simple to operate and the manufacturing process is stable and reliable. By forging the billet twice, namely pre-forging and final forging, the filling is complete during forging, and the forged partition has excellent physical properties. The mold is heated and lubricated before forging, so that the demolding and filling performance are taken into account during forging. While ensuring full filling, it is easy to demold the forging, and the deformation of the partition is controlled within a reasonable range. Through residual heat solution treatment and artificial aging treatment, the physical properties of the partition are excellent, which meets the requirements of vehicle battery pack.

[0026] This invention provides a pre-forging lower die cavity and a final forging lower die cavity on the lower die, and a pre-forging upper die cavity and a final forging upper die cavity on the upper die. This allows for simultaneous pre-forging and final forging in a single stamping operation, and the pre-forged parts can be finalized in a timely manner, resulting in high production efficiency.

[0027] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, wherein:

[0030] Figure 1 is a schematic diagram of the forging structure according to the present invention;

[0031] Figure 2 is a structural schematic diagram of the partition component according to the present invention;

[0032] Figure 3 is a schematic diagram of the right-view structure according to the present invention;

[0033] Figure 4 is a schematic diagram of the current surface bumps on forgings;

[0034] Figure 5 is a schematic diagram of the lower mold structure according to the present invention;

[0035] Figure 6 is a schematic diagram of the second angle structure of the lower mold according to the present invention;

[0036] Figure 7 is a schematic diagram of the upper mold structure according to the present invention;

[0037] Figure 8 is a schematic diagram of the detection area of ​​the partition component according to the present invention;

[0038] Figure 9 is a schematic diagram of the bending test of the present invention;

[0039] Figure label:

[0040] 1. Body, 2. Columnar arch, 3. Positioning point, 4. Groove, 5. Cutting edge step surface, 11. Machining surface, 12. Mounting hole, 13. Mounting groove, 14. Protrusion, 15. Lower die a1, 16. Upper die a2, 17. Guide positioning groove a11, 18. Pre-forging lower die cavity a12, 19. Final forging lower die cavity a13, 10. Protrusion a14, Lower flash receiving surface a15, Lower rib a16, Ejection hole a17, Waist-shaped groove a18, Heating hole a19, Arc-shaped positioning groove a121, Positioning end face a122, Guide positioning protrusion a21, Pre-forging upper die cavity a22, Final forging upper die cavity a23, Upper rib a24, Upper flash receiving surface a25. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] The forging structure, forging method, and forging die of the partition component according to embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] As shown in Figures 1-4, the forging structure of the partition member according to an embodiment of the present invention includes a body 1 and a cylindrical arched portion 2. The axis of the cylindrical arched portion 2 is parallel to the plane of the body 1. The cylindrical arched portion 2 protrudes from the body 1 along the thickness direction. The part of the cylindrical arched portion 2 that protrudes from the body 1 is a smooth arc surface. The radius of the rounded corner between the cylindrical arched portion 2 and the side edge is ≤5mm.

[0046] Furthermore, the forging structure is integrally forged from an aluminum alloy bar. The upper and lower surfaces of the forging structure are smooth and burr-free.

[0047] In other words, the main body 1 is generally a rectangular plate structure. Since the partition needs to be connected to the frame during use, mounting holes 12 and mounting grooves 13 need to be opened on the partition. At the same time, in order to ensure the installation accuracy, the side of the partition needs to be machined to form a machined surface 11. This makes the thickness of the forging structure at the mounting hole 12 relatively high. The columnar arch 2 protrudes from the main body 1 along the thickness direction. At this time, the columnar arch 2 is difficult to be completely filled. Existing solutions usually open vent holes in the mold and form a protrusion 14 on the surface of the columnar arch 2 after filling. However, in the forging structure of this application, the radius of the rounded corner between the columnar arch 2 and the side edge is ≤5mm, which allows the edge of the columnar arch 2 to be completely filled. The smooth surface is easy to demold, avoiding edge collapse and eliminating the protrusion 14 or burrs that affect the use of the partition.

[0048] In this embodiment, four positioning points 3 are provided on both the upper and lower surfaces of the body 1. Any three of the four positioning points 3 on the same surface form a plane, and the height difference between the remaining positioning point 3 and the plane is ≤1mm.

[0049] In other words, the forging structure of this application has four positioning points 3. A plane is determined by three points, and the height difference of the other point relative to the plane is ≤1mm. Therefore, the forging structure of this application is relatively flat, with small deformation, which meets the requirements of subsequent machining and battery pack installation.

[0050] According to one embodiment of the present invention, the machining allowance reserved on the side edge of the body 1 is 1.8-2mm. The machining allowance reserved on the side of the body 1 is moderate, which improves the material utilization rate during the forging process and leaves machining allowance for machining, ensuring that the machining can produce the machined surface 11.

[0051] In this embodiment, the main body 1 is provided with a groove 4, which is located on the axis of the columnar arched part 2, and the two sides of the groove 4 protrude upward and downward to the upper and lower surfaces.

[0052] The groove 4 needs to be removed during subsequent machining, but the groove 4 on the forging structure allows metal to fill the sides of the groove, ensuring the filling effect on both sides of the groove 4.

[0053] According to one embodiment of the present invention, a tangent step surface 11 is formed on the outer contour of the body 1, and the width of the tangent step surface 11 is 1.8-3mm.

[0054] In other words, the thickness of the flash affects the filling performance. Setting the width of the cut edge step surface 11 to 1.8-3mm can ensure that the material is filled into the cavity corresponding to the cylindrical arch part 2.

[0055] The draft angle of the outer contour surface of body 1 is 3-8°. Further, the draft angle of the outer contour surface of body 1 is 5°.

[0056] A larger draft angle facilitates demolding, while a smaller draft angle results in higher material utilization. A draft angle of 3-8° is matched with a machining allowance of 1.8-2mm, which improves material utilization while utilizing demolding.

[0057] According to one embodiment of the present invention, there are two cylindrical arched portions 2, and an X-shaped reinforcing rib is provided on the main body 1, with the X-shaped reinforcing rib located between the two cylindrical arched portions 2. The X-shaped reinforcing rib can effectively increase the strength of the thinner part of the main body 1 and improve its resistance to deformation.

[0058] In summary, the forging structure of the present invention is easy to form, and the surface of the cylindrical arch 2 protruding from the body 1 is smooth, without protrusions, burrs, etc., which on the one hand makes the partition part have higher safety performance when used in the battery pack, and on the other hand makes it easier to peel off from the cavity after forging, avoiding sticking to the mold, ensuring the processing effect, controlling the deformation of the partition part within a reasonable range, the deformation is small, which is conducive to positioning during cutting, and the radius of the rounded corners of the cylindrical arch 2 and the side edge is ≤5mm, and the edge is fully formed, so that the cylindrical arch 2 has enough material to perform hole processing, which has better filling effect and higher material utilization rate.

[0059] A forging method for a partition member according to an embodiment of the present invention includes,

[0060] Step 1: Select appropriate raw materials for cutting to obtain blanks; select aluminum alloy 6082 bar with a diameter of 48mm. When cutting, use a circular saw to cut at a speed of 3650r / min and remove burrs from the cut surface.

[0061] Step 2: Heat the billet to a forging temperature of 510±10℃; specifically, use a chain plate heating furnace to heat the billet. Set the heating temperature of the chain plate heating furnace to 550℃ and the heating time to 60±5 minutes. Detect the temperature of the billet when it exits the furnace. If the temperature of the billet when it exits the furnace is higher than 520℃, it will be scrapped directly. If the temperature of the billet when it exits the furnace is lower than 500℃, it is allowed to be reheated, and the total number of heating times shall not exceed three.

[0062] Step 3: Pre-forging the billet to form a pre-forged part, and then performing a final forging operation on the pre-forged part to form a final forged part. The pre-forging mold and final forging mold are pre-designed according to the structure of the partition component. The pre-forging mold cavity is equipped with a positioning surface for positioning the bar stock. The pre-forged part is 1.5-2.5 mm higher than the final forged part. In this embodiment, the final forging operation of the previous pre-forged part and the pre-forging operation of the subsequent billet are performed simultaneously to achieve continuous operation. Before starting Step 3, the mold needs to be rapidly heated using a spray gun. During the forging process, resistance heating rods inside the mold are used to maintain the mold temperature at 150-190℃. In Step 3, before each forging, a layer of lubricant is evenly sprayed onto the cavity surfaces of the upper and lower molds. When preparing the lubricant, water-based lubricant and graphite lubricant are first mixed in a certain proportion to form a mixed lubricant. Then, the mixed lubricant is mixed with water to form a lubricant solution. The concentration of the mixed lubricant is not less than 10%. Furthermore, in the mixed lubricant, the water-based lubricant comprises 1-3 parts, and the graphite lubricant comprises 2-4 parts. The water-based lubricant is designated as grade 2655, and the graphite lubricant as grade 647.

[0063] Step 4: Perform residual heat solution treatment on the final forging. During residual heat solution treatment, ensure that the plane of the final forging is perpendicular to the horizontal plane and enters the water.

[0064] Step 5: Remove the flash from the final forging.

[0065] Step Six: Perform artificial aging treatment at a temperature of 170±5℃ for 9 hours.

[0066] Step 7: Post-treatment. The post-treatment is shot blasting, using 304 stainless steel shot with a diameter of 0.6mm.

[0067] Example 1

[0068] The lubricant used in Example 1 consisted of 2 parts water-based lubricant, 3 parts graphite lubricant, and 45 parts water.

[0069] Comparative Example 1

[0070] The lubricant used in Comparative Example 1 consisted of 2 parts water-based lubricant, 3 parts graphite lubricant, and 90 parts water.

[0071] Comparative Example 2

[0072] The lubricant used in Comparative Example 2 was 1 part of AL25 lubricant and 8 parts of water.

[0073] Comparative Example 3

[0074] The lubricant used in Comparative Example 3 was 1 part of AL100 / 21 lubricant and 8 parts of water.

[0075] Comparative Example 4

[0076] The lubricant used in Comparative Example 4 was 1 part of AL100 / 21 lubricant and 6 parts of water.

[0077] Comparative Example 5

[0078] The lubricant used in Comparative Example 5 was: 3 parts of Lubricant No. 1, 2 parts of Lubricant No. 2, and 90 parts of water.

[0079] Comparative Example 6

[0080] The difference between the process of Comparative Example 6 and Example 1 is that the edges are trimmed first after forging, and then solution treatment is performed.

[0081] The partition was placed horizontally, and the actual height coordinates of different points on the upper surface of the partition were measured. The difference between the actual height coordinates and the theoretical height coordinates was the deformation (mm). A positive deformation indicated that the point was higher than the theoretical height coordinates, and a negative deformation indicated that the point was lower than the theoretical height coordinates. At least 20 test pieces were used for each embodiment and comparative example, and the test results are shown in Table 1.

[0082] Table 1

[0083] As can be seen from the data in Table 1, due to the thinness of the partition body, it is prone to deformation during forging and demolding, resulting in deformation exceeding the specified limits. However, using the lubricant formulation of this application, the deformation during forging is smaller, and there is no sticking to the mold. Furthermore, if the process of trimming before solution treatment is used, the deformation is significantly higher than that of solution treatment before trimming. It should also be noted that the mold temperature during forging in the examples in Table 1 was maintained at 180±10℃. When the test was conducted at a mold temperature of 220℃, sticking to the mold occurred in all examples, and the partition removed after sticking showed obvious bending.

[0084] The water immersion angle of the partition component in Example 1 during residual heat solution treatment was tested. The final forging was immersed in water in a direction perpendicular to the horizontal plane and in a direction parallel to the horizontal plane. The deformation amount of the direction perpendicular to the horizontal plane is shown in Table 1, while the average deformation amount of the direction parallel to the horizontal plane is 0.421. Therefore, it is better to immerse the component in water in a direction perpendicular to the horizontal plane when using residual heat solution treatment.

[0085] Example 2

[0086] In Example 2, the forging heating was carried out for 45 minutes, and the residual heat solution treatment was combined with artificial aging treatment.

[0087] Example 3

[0088] In Example 3, the forging heating was carried out for 60 minutes, and the residual heat solution treatment was combined with artificial aging treatment.

[0089] Example 4

[0090] In Example 4, the forging heating was carried out for 75 minutes, and the residual heat solution treatment was combined with artificial aging treatment.

[0091] Example 5

[0092] In Example 5, the forging heating was carried out for 95 minutes, and the residual heat solution treatment was combined with artificial aging treatment.

[0093] Comparative Example 6

[0094] In Comparative Example 6, the sample was fully dissolved at 520°C for 2 hours and then artificially aged.

[0095] Comparative Example 7

[0096] In Comparative Example 7, the sample was fully dissolved at 540°C for 2 hours and then artificially aged.

[0097] The partitions of Examples 2, 3, 4, 5 and Comparative Examples 7 and 8 were tested according to the test area shown in Figure 2. At least 20 test pieces were tested for each example and comparative example. The hardness data of the test profile is shown in Table 2, the surface hardness data is shown in Table 3, the core hardness data is shown in Table 4, the tensile strength data is shown in Table 5, and the maximum coarse grains of the test profile are shown in Table 6.

[0098] Table 2

[0099] Table 3

[0100] Table 4

[0101] Table 5

[0102] Table 6

[0103] From the above test data, it can be seen that,

[0104] The partition components are fully solution-treated at 520℃ or 540℃ and then artificially aged at 170℃ for 9 hours. The surface hardness difference is 10HV1, the core hardness difference is 11.5-13.7HV1, and the core and surface hardness differences are equivalent.

[0105] The partition components are subjected to residual heat solution treatment + artificial aging at 170℃ for 9 hours, and forging heating to 550℃ for 45 to 95 minutes. The surface hardness range is 13.4-20.5HV1, the core hardness range is 10.4-17.1HV1, and the core and surface hardness ranges are similar.

[0106] Using residual heat solution treatment and artificial aging, the longitudinal average tensile strength is 387.5 MPa when the forging heating is not fully dissolved after 45 minutes. When the forging heating is 60 to 90 minutes, the solution is fully dissolved and the tensile strength is at its peak. Compared with solution treatment and artificial aging, the peak strength is about 20-30 MPa higher.

[0107] When the residual heat is fully dissolved (heated at 550℃ for 60-90 min), the longitudinal tensile strength difference is 1.3-5 MPa, which is comparable to the longitudinal tensile strength difference of 3-5 MPa after forging and solution treatment alone (the coarse grains on the surface of the partition part have little effect on the tensile test).

[0108] Compared with Example 3 and Comparative Example 8, the peak strength of residual heat solution treatment is 21.6 MPa higher than that of solution treatment after forging. Furthermore, the maximum coarse grain of Example 3 is significantly smaller than that of Comparative Example 8 (the maximum coarse grain depth of Example 3 is 0.59 mm, and the maximum coarse grain depth of Comparative Example 8 is 4 mm). The coarse grain of forging treated with residual heat solution treatment is significantly smaller than that of solution treatment after forging alone.

[0109] Therefore, the forging process of the partition component, which involves heating at 550℃ for 60±5 minutes, provides better residual heat solution treatment than post-forging solution treatment (resulting in 20-30 MPa higher strength after peak aging). On one hand, the forging process described in this application allows for heating for a certain time before forging and utilizing residual heat for solution treatment after forging. Compared to post-forging solution treatment, this invention offers higher processing efficiency, is more suitable for industrial production, and produces comparable hardness, smaller coarse grains, superior tensile strength, and overall better physical properties. The heating time of 60 minutes is chosen to minimize the time while balancing processing efficiency and product quality.

[0110] In summary, the manufacturing method of the partition component of the present invention preheats the mold to an appropriate temperature and sprays the prepared lubricant, while placing the edge trimming process after the solution treatment, so that the manufactured partition component has a smaller deformation. The present invention heats the part for 60±5 minutes before forging and performs residual heat solution treatment and artificial aging treatment after forging, so that the partition component has excellent physical properties, balancing efficiency and quality.

[0111] The outer surface of the intermediate crossbeam forging is shot blasted using a mesh belt shot blasting machine. The diameter of the shot used is 0.3-1.2mm, the power of the shot blasting head is 25-35Hz, the number of shot blasting heads is 8, the speed of the conveyor motor of the mesh belt is 8-15Hz, the length of the mesh belt is 8m, and the shot blasting is performed twice on both the front and back sides of the intermediate crossbeam forging.

[0112] The present invention also discloses an intermediate crossbeam forging, which is obtained by performing surface treatment on the intermediate crossbeam forging using the above-mentioned surface treatment method.

[0113] Specifically, when the test pressure in the bending performance test area of ​​the intermediate crossbeam forging reaches 30N, the actual bending angle of the intermediate crossbeam forging in the bending performance test area is converted to the standard bending angle of a 2mm thickness. The standard bending angle of a 2mm thickness is greater than or equal to 70°. Furthermore, the surface roughness of the intermediate crossbeam forging after surface treatment is Ra3.2 to Ra12.5.

[0114] Example 6

[0115] The shot used in the shot blasting is 0.6mm in diameter and made of stainless steel. The conveyor belt motor speed is 10Hz, the blasting head power is 30Hz, and other parameters remain unchanged.

[0116] Comparative Example 9

[0117] The shot used for shot blasting is a mixture of 0.6mm and 0.3mm diameter shot in a 1:1 ratio. The shot material is stainless steel. The conveyor motor speed of the mesh belt is 10Hz, and the power of the blasting head is 30Hz. Other parameters remain unchanged.

[0118] Comparative Example 10

[0119] The shot used for shot blasting has a diameter of 1.0mm + 1.2mm mixed in a 1:1 ratio and is made of aluminum. The conveyor belt motor speed is 10Hz, the blasting head power is 48Hz, and other parameters remain unchanged.

[0120] Comparative Example 11

[0121] The shot used for shot blasting has a diameter of 1.0mm + 1.2mm mixed in a 1:1 ratio and is made of aluminum. The conveyor belt motor speed is 8Hz, the blasting head power is 45Hz, and other parameters remain unchanged.

[0122] The above embodiments and comparative examples were subjected to bending tests as shown in Figure 9. The test area in Figure 8 was cut into 60*15*4mm samples. The roughness of the upper and lower surfaces of the samples was tested. The rougher side of the sample was placed on the fixture with the rougher side facing down. The pressure head was moved downward until the pressure of the pressure head reached 30N and then stopped. The angle of the bent sample was tested and converted into the angle value of 2mm thickness. Three samples were made for each embodiment and comparative example for testing. The test structure is shown in Table 7.

[0123] Table 7

[0124] As can be seen from Table 7, the bending angle of the 2mm thick sample in Example 6 after conversion is above 70°, while the bending angle of the 2mm thick samples in Comparative Examples 9, 10, and 11 after conversion is below 70°.

[0125] In summary, surface treatment is a process that removes surface oxide scale and alters the surface roughness of a product. Traditionally, it is believed that surface treatment does not affect the bending performance of a product. This invention is simple to operate and, by controlling the shot blasting process parameters, improves the bending performance of the intermediate crossbeam forging, thus overcoming the traditional misconception that shot blasting surface treatment does not affect physical properties.

[0126] As shown in Figures 5-7, the forging die according to an embodiment of the present invention includes: a lower die a1 and an upper die a2. The upper surface of the lower die a1 is provided with a pre-forging lower die cavity a12 and a final forging lower die cavity a13 spaced apart. The middle part of the pre-forging lower die cavity a12 is provided with an arc-shaped positioning groove a121 and a positioning end face a122. The arc-shaped positioning groove a121 and the positioning end face a122 are spaced apart along the length direction of the pre-forging lower die cavity a12. The arc-shaped positioning groove a121 is used to support and position the side of the bar stock, and the positioning end face a122 is used to position the end face of the bar stock. The lower surface of the upper die a2 is provided with a pre-forging upper die cavity a22 and a final forging upper die cavity a23 spaced apart. The pre-forging upper die cavity a22 corresponds to the pre-forging lower die cavity a12, and the final forging upper die cavity a23 corresponds to the final forging lower die cavity a13.

[0127] In other words, the bar stock is formed into a pre-forging part between the upper pre-forging die cavity a22 and the lower pre-forging die cavity a12. The pre-forging part is formed into a final forging part between the upper final forging die cavity a23 and the lower final forging die cavity a13. The arc-shaped positioning groove a121 can support and position the bar stock to prevent it from rolling. The positioning end face a122 can abut against one end of the bar stock to ensure that the inserted bar stock falls in the same position in the lower pre-forging die cavity a12, maintaining the consistency of material feeding, thereby ensuring complete filling during forging and stable forging quality.

[0128] According to one embodiment of this utility model, a guide positioning groove a11 is provided on the lower die a1, and a guide positioning protrusion a21 is provided on the upper die a2. During forging, the guide positioning protrusion a21 enters the guide positioning groove a11 to complete the guiding fit.

[0129] In this embodiment, there are four guide positioning protrusions a21 and four guide positioning grooves a11. The four guide positioning protrusions a21 are distributed on the four corners of the upper die a2, and the four guide positioning grooves a11 are distributed on the four corners of the lower die a1. During stamping, the guide positioning protrusions a21 and the guide positioning grooves a11 cooperate to ensure forging accuracy.

[0130] Preferably, both ends of the pre-forging lower die cavity a12 and the final forging lower die cavity a13 along the length direction are provided with protrusions a14, and the upper end surface of the protrusions a14 is a plane.

[0131] In other words, the protrusion a14 is designed so that the flash during forging can form a clamping plane at both ends in the length direction, so that the robot can clamp it, thereby facilitating automated production.

[0132] In this embodiment, the upper surface of the lower die a1 is further formed with a lower flash receiving surface a15, which is located outside the pre-forging lower die cavity a12 and the final forging lower die cavity a13. Further, the lower surface of the upper die a2 is further formed with an upper flash receiving surface a25, which is located outside the pre-forging upper die cavity a22 and the final forging upper die cavity a23, and is positioned opposite to the lower flash receiving surface a15. The upper flash receiving surface a25 and the lower flash receiving surface a15 cooperate to facilitate the flow of metal between them during forging, thereby forming flash.

[0133] According to one embodiment of the present invention, a plurality of lower ribs a16 are provided between the pre-forging lower die cavity a12 and the final forging lower die cavity a13, and a plurality of upper ribs a24 are provided between the pre-forging upper die cavity a22 and the final forging upper die cavity a23. During forging, the plurality of lower ribs a16 and the plurality of upper ribs a24 are alternately arranged.

[0134] In this embodiment, by setting multiple lower ribs a16 and multiple upper ribs a24 to cooperate, the flash is bent between the multiple lower ribs a16 and multiple upper ribs a24, which on the one hand hinders the outward flow of metal, and on the other hand facilitates the metal filling of deeper cavities.

[0135] According to one embodiment of the present invention, both the lower die a1 and the upper die a2 are provided with ejector holes a17 extending through the thickness direction, and the ejector holes are located in the flash area of ​​the forging. An ejector rod can be provided in the ejector hole a17. After forging, the flash is pushed up by the ejector rod, thereby lifting the forging from the cavity to a certain height so that it can be grasped by a robot.

[0136] In this embodiment, both the lower die a1 and the upper die a2 have waist-shaped grooves a18 on their sides, and multiple heating holes a19 are spaced apart in the waist-shaped grooves a18. The heating holes a19 are used to place the heating rod. That is to say, the waist-shaped holes a18 facilitate the melting and installation of the head of the heating rod, and at the same time prevent the release agent sprayed during forging from flowing into the heating holes a19.

[0137] According to one embodiment of the present invention, lifting holes are also provided on the sides of the lower mold a1 and the upper mold a2. Furthermore, keyways for mounting and positioning are provided on the lower surface of the lower mold a1 and the upper surface of the upper mold a2.

[0138] Because the mold is heavy, the side is equipped with lifting holes to facilitate the lifting by a crane. Furthermore, keyways are provided on both the lower mold a1 and the upper mold a2 to ensure installation accuracy and efficiency, thereby improving the precision of forging.

[0139] The beneficial effects of this invention are that by setting a pre-forging lower die cavity a12 and a final forging lower die cavity a13 on the lower die a1, and setting a pre-forging upper die cavity a22 and a final forging upper die cavity a23 on the upper die a2, pre-forging and final forging are performed simultaneously in one stamping, and the pre-forged part can be finalized in a timely manner, resulting in high production efficiency. This invention also provides an arc-shaped positioning groove a121 and a positioning end face a122 in the middle of the pre-forging lower die cavity a12. On the one hand, it supports the side of the bar stock to prevent it from rolling, and on the other hand, it positions the end face of the bar stock. Ultimately, the bar stock placed in the pre-forging lower die cavity a12 is kept in the same forging position, ensuring complete filling and improving the forging effect.

[0140] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0141] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A forged structure for a partition member, characterized in that, Comprise: The body (1) is substantially plate-shaped, and four positioning points (3) are arranged on the upper and lower surfaces of the body (1); any three of the four positioning points (3) on the same surface form a plane, and the height difference of the remaining one positioning point (3) from the plane is less than or equal to 1mm; The cylindrical arch part (2) is parallel to the plane on which the body (1) is located, and the cylindrical arch part (2) protrudes from the body (1) in the thickness direction; the part of the cylindrical arch part (2) protruding from the body (1) is a smooth arc surface.

2. The spacer piece forging structure of claim 1, wherein The radius of the fillet of the side edge of the cylindrical arch part (2) is less than or equal to 5mm.

3. The spacer piece forging structure of claim 1, wherein The machining allowance of the side edge of the body (1) is 1.8-2mm, and the demolding slope of the side of the body (1) is 3-8°.

4. The spacer piece forging structure of claim 1, wherein A cut edge step surface (11) is formed on the outer contour of the body (1), and the width of the cut edge step surface (11) is 1.8-3mm.

5. The spacer piece forging structure of claim 1, wherein The number of the cylindrical arch parts (2) is two, and an X-shaped reinforcing rib is arranged on the body (1) and located between the two cylindrical arch parts (2).

6. The spacer piece wrought structure of claim 1, wherein The thickness of the cylindrical arch part (2) is greater than 20mm, and the thickness of the thinnest part of the body (1) is between 3mm and 4mm.

7. The spacer piece wrought structure of claim 1, wherein The body (1) has a bending performance test area, and the test is stopped when the test pressure reaches 30N; the actual bending angle of the bending performance test area is converted into a standard bending angle of 2mm thickness, and the standard bending angle of 2mm thickness is greater than or equal to 70°.

8. The spacer piece wrought structure of claim 1, wherein The body (1) is provided with a groove part (4) located on the axis of the cylindrical arch part (2), and the groove part (4) protrudes upward and downward from the upper and lower surfaces.

9. A method for forging a structure as claimed in any one of claims 1-8, characterized in that, Comprise the following steps, S1, design the pre-forging die and the finish-forging die according to the structure of the forgings; S2, blanking to obtain a blank; S3, heating the blank to a forging temperature; S4, sequentially performing pre-forging and finish-forging on the blank; S5, performing residual heat solid solution treatment; S6, cutting off the flash; S7, performing artificial aging treatment; S8, performing surface treatment.

10. The forging method according to claim 9, characterized in that, In S4, the mold is heated first during forging, and then a layer of lubricating liquid is sprayed on the surface of the cavity of the mold; when the lubricating liquid is prepared, the water-based lubricant and the graphite lubricant are mixed in a certain proportion to form a mixed lubricant, and then the mixed lubricant is mixed with water to form the lubricating liquid, wherein the concentration of the mixed lubricant is not less than 10%.

11. The forging method according to claim 10, characterized in that, In the mixed lubricant, the water-based lubricant is 1-3 parts, and the graphite lubricant is 2-4 parts.

12. The forging method of claim 10, wherein, Before the start of forging, the mold is quickly heated using a spray gun, and the mold is kept warm during forging, so that the temperature of the mold cavity surface is maintained at 150-190℃; the lubricating liquid needs to be uniformly sprayed on the surface of the mold cavity before each forging.

13. The forging method of claim 9, wherein, The selected raw material is aluminum alloy 6082 bar stock, and the forging temperature is 510±10℃.

14. The forging method of claim 9, wherein, In S4, the height of the pre-forging piece formed by pre-forging is 1.5-2.5mm higher than that of the finish-forging piece formed by finish-forging.

15. The forging method of claim 9, wherein, In S5, the remaining heat solid solution time ensures that the plane of the final forging is perpendicular to the horizontal plane and enters the water downward, and in S7, the temperature of the artificial aging treatment is 170 DEG C and the time is 9 hours.

16. The forging method of claim 9, wherein, The surface treatment is shot blasting treatment, and the shot blasting treatment equipment is a mesh belt shot blasting machine, wherein the shot blasting adopts shot material with a diameter of 0.3-1.2 mm, the power of the shot head is 25-35 Hz, the number of the shot head is 6-10, the conveying motor speed of the mesh belt is 8-15 Hz, and the shot blasting times of the front and back surfaces of the intermediate cross beam forging are both twice.

17. A forging die for use in a forging operation of the forged structure as recited in any one of claims 1 to 8, characterized by, The method comprises the steps that a lower die (1) is provided with a pre-forging lower die cavity (12) and a finish-forging lower die cavity (13) at an upper surface thereof, the pre-forging lower die cavity (12) is provided with an arc-shaped positioning groove (121) and a positioning end face (122) at a middle portion thereof, the arc-shaped positioning groove (121) and the positioning end face (122) are arranged at intervals along a length direction of the pre-forging lower die cavity (12), the arc-shaped positioning groove (121) is used for supporting and positioning a side surface of a bar material, and the positioning end face (122) is used for positioning an end surface of the bar material; an upper die (2) is provided with a pre-forging upper die cavity (22) and a finish-forging upper die cavity (23) at a lower surface thereof, the pre-forging upper die cavity (22) corresponds to the pre-forging lower die cavity (12), and the finish-forging upper die cavity (23) corresponds to the finish-forging lower die cavity (13); during forging, finish-forging of a previous pre-forging piece and pre-forging of a subsequent blank are simultaneously performed to realize continuous operation. waist-shaped grooves (18) are formed in side surfaces of the lower die (1) and the upper die (2), a plurality of heating holes (19) are arranged at intervals in the waist-shaped grooves (18), the heating holes (19) are used for placing heating rods, and the heating rods are used for heat preservation of the dies.

18. The forging die of claim 17, wherein, ​

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