Batch manufacturing method of battery frame connecting rods

Abstract

The invention relates to a batch manufacturing method of a battery frame connecting rod. The batch manufacturing method comprises the following steps: step 1, putting a material into a cold forging die through a carrying assembly, and carrying out step-by-step cold forging forming; secondly, solution treatment is conducted on the workpiece subjected to cold forging forming in the first step; thirdly, aging treatment is conducted on the workpiece subjected to solution treatment in the second step, and then cooling is conducted; fourthly, the workpiece pretreated in the third step is placed on a feeding structure on one side of a machining tool; fifthly, the workpiece is transferred between the feeding structure and the machining tool through the transferring structure; and sixthly, the workpiece is machined through a cutter in the machining machine tool. Workpieces are transferred between the cold forging dies through the carrying assembly, the cold forging dies conduct cold forging forming on bars step by step, then the workpieces subjected to cold forging are subjected to solution treatment and aging treatment, the workpieces subjected to cold forging are put into a machining tool to be machined through the transferring structure, the forming efficiency of the workpieces is improved, the cost is saved, and the performance of the finished workpieces is improved.

Description

Technical Field

[0001] This invention belongs to the field of battery accessory manufacturing technology, and specifically relates to a method for mass manufacturing of battery frame connecting rods. Background Technology

[0002] Battery frame connecting rods are a crucial component in the structure of battery packs (especially power battery packs for new energy vehicles). Also commonly referred to as battery pack struts, tie rods, or string rods, they are long, rod-shaped fasteners that run through battery modules or cell stacks.

[0003] The core function of the battery frame connecting rod is structural connection and fixation. Although it looks like a simple "long rod," it is the "backbone" of the battery pack's structural safety. Its design, materials, and manufacturing process directly affect the structural integrity, safety, and reliability of the battery pack throughout the vehicle's lifecycle. With the increase in battery energy density and increasingly stringent safety requirements, the performance requirements for the connecting rod are also becoming higher and higher.

[0004] Existing battery frame connecting rods, after being forged using cold forging dies, have poor stability and are prone to deformation or cracking during subsequent processing or use. If they break when used in power battery packs, they can easily cause safety accidents. Moreover, the entire manufacturing process requires manual handling and transfer, resulting in low production efficiency and an inability to meet the production needs of large-volume products. Summary of the Invention

[0005] The present invention provides a method for mass manufacturing of battery frame connecting rods, which solves the defects of existing battery connecting rods, such as poor stability after forging, easy deformation or cracking during processing or use, and low manufacturing efficiency.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a method for mass manufacturing of battery frame connecting rods, comprising: Step 1: The material is placed into the cold forging die through a series of transfer components and then cold forged step by step. Step 2: Perform solution treatment on the workpiece after cold forging in Step 1; Step 3: Perform aging treatment on the workpiece after solution treatment in Step 2, and then cool it; Step 4: Place the pre-treated workpiece from Step 3 onto the feeding structure on one side of the machine tool; Step 5: Transfer the workpiece between the feeding structure and the machine tool using the transfer structure; Step Six: The workpiece is machined by the cutting tools inside the machine tool.

[0007] Ideally, in step two, the solution treatment involves heating from room temperature to 510–550°C over 1 hour, holding at that temperature for 3 hours, and then immersing in water for extreme cooling for 1.5–2.5 minutes.

[0008] Ideally, the aging process in step three involves raising the furnace temperature from room temperature to 160–190°C over 3 hours and holding it at that temperature for 8 hours; the cooling process in step two involves natural cooling.

[0009] Ideally, the conveying assembly in step one includes a movable plate movably disposed between two adjacent sets of cold forging dies, a clamping arm rotatably mounted on the top of the movable plate, and a clamping unit fixed to the end of the clamping arm.

[0010] Optimally, the cold forging die in step one includes a lower die base, a lower die core fixed to the top of the lower die base, a first die cavity opened on the top of the lower die core, an upper die base that is vertically mounted above the lower die base, an upper punch fixed to the bottom of the upper die base and cooperating with the first die cavity, a push rod that is vertically mounted through the lower die core, a lower die locking mechanism located outside the lower die core, and an upper die locking mechanism located outside the upper punch.

[0011] Optimally, the lower mold locking mechanism includes a lower cylinder fixed to the top of the lower mold base, a lower mold sleeve installed in the lower cylinder, and a lower mold locking ring fixed to the top of the lower cylinder and used to press the lower mold sleeve. The lower mold core is fitted inside the lower mold sleeve and engages with the inclined surface of the lower mold sleeve. The upper mold locking mechanism includes an upper cylinder fixed to the bottom of the upper mold base, an upper clamping plate installed in the upper cylinder, and an upper mold locking ring fixed to the bottom of the upper cylinder and used to press the upper clamping plate. The upper punch is fitted inside the upper clamping plate and engages with the upper clamping plate in a stepped manner.

[0012] Optimally, the clamping unit includes a clamping block fixed on the clamping arm, a first clamping block and a second clamping block that are relatively movably installed in the clamping block, a first clamping plate fixed on one side of the first clamping block and spaced apart, a second clamping plate fixed on one side of the second clamping block, a first clamping groove opened on the inner side of the first clamping plate, and a second clamping groove opened on the inner side of the second clamping plate, wherein the horizontal projection of the second clamping plate falls on the middle of the first clamping plate.

[0013] Optimally, the feeding structure in step four includes a transfer frame, a first feeding plate and a second feeding plate that are alternately and movably installed on the top of the transfer frame, a loading assembly fixed on the top of the first feeding plate and the second feeding plate, and a clearance assembly disposed in the transfer frame for driving the first feeding plate to avoid the second feeding plate, wherein the workpiece is placed on the loading assembly.

[0014] Optimally, the transfer structure in step five includes a transfer frame mounted on the processing machine table, a transfer plate movably mounted on the top of the transfer frame, a second lifting plate movably mounted on one side of the transfer plate, and a clamping assembly fixed to the bottom of the second lifting plate. The clamping assembly is used to clamp the workpiece and drive the workpiece to switch back and forth between horizontal and vertical states.

[0015] Optimally, the gripping assembly includes a lifting block fixed to the bottom of the second lifting plate, a first mounting surface inclinedly disposed at the bottom of the lifting block, a mounting block rotatably mounted on the first mounting surface, and finger cylinders fixed on both sides of the mounting block, wherein the rotation axis of the mounting block is perpendicular to the first mounting surface.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The present invention provides a method for mass manufacturing battery frame connecting rods. By transferring workpieces between cold forging dies using a transport component, the raw material bars are cold forged step by step by the cold forging dies. The forged workpieces undergo solution treatment and aging treatment, which improves the strength and service life of the workpieces. The cold-forged workpieces are then placed into a processing machine tool for processing through a transfer structure, which improves the forming and transfer efficiency of the workpieces, saves labor input, reduces costs, and also improves the performance of the finished workpieces, which is beneficial to improving the energy density and safety performance of the battery pack. Attached Figure Description

[0017] Figure 1 A simplified schematic diagram of the existing battery frame connecting rod structure; Figure 2 This is a process diagram of the first processing step of the battery frame connecting rod of the present invention (the shaded area is the processing part of the corresponding process). Figure 3 This is a process diagram of the second processing step of the battery frame connecting rod of the present invention (the shaded area is the processing part of the corresponding process). Figure 4 This is a process diagram of the third processing step of the battery frame connecting rod of the present invention (the shaded area is the processing part of the corresponding process). Figure 5 This is a process diagram of the fourth processing step of the battery frame connecting rod of the present invention (the shaded area is the processing part of the corresponding process). Figure 6 This is a schematic diagram of the manufacturing process of the present invention; Figure 7 This is a schematic diagram of the cold forging die of the present invention; Figure 8 For the present invention Figure 7 A sectional view; Figure 9 This invention Figure 7A sectional view; Figure 10 This is a schematic diagram of the conveying assembly between adjacent cold forging dies of the present invention; Figure 11 This is a schematic diagram of the transport mechanism of the present invention; Figure 12 This is a front view of the conveying mechanism of the present invention; Figure 13 This is a cross-sectional view of the conveying mechanism of the present invention; Figure 14 This is a schematic diagram of the transfer structure of the present invention; Figure 15 For the present invention Figure 14 A partial structural diagram; Figure 16 This is a simplified schematic diagram of the interior of the machine tool used in this invention. Figure 17 This is a schematic diagram of the feeding structure of the present invention; Figure 18 This is a schematic diagram of the internal structure of the feeding structure of the present invention; Figure 19 For the present invention Figure 18 A partial structural diagram; Figure 20 This is a schematic diagram of the carrier disk of the present invention; Explanation of reference numerals in the attached figures: 100. Lower auxiliary platform; 101. Lower auxiliary platform pad; 102. Lower ejector pin; 103. Lower mold base; 104. Lower mold base pad; 105. Lower mold limiting post; 106. Outer guide sleeve; 107. Lower cylinder body; 108. Lower pad plate; 109. First ejector rod; 110. Second ejector rod; 111. Lower mold sleeve; 112. Lower mold core; 113. First mold cavity; 114. Lower mold locking ring; 115. Upper mold base; 116. Upper mold base pad; 117. Upper mold limiting post; 118. Outer guide post; 119. Upper pad block; 120. Upper cylinder body; 121. Upper clamping plate; 122. Upper mold locking ring; 123. Upper punch; 124. 125. Limiting plate; 126. Wear-resistant plate; 127. Slide plate; 128. Fixing block; 129. Punch column; 120. First moving plate; 131. First cylinder mounting plate; 132. First rotary cylinder; 133. Clamping arm; 134. Clamping block; 135. Guide rod; 136. First clamping block; 137. Second clamping block; 138. Rotary motor; 139. Locking post; 140. Turning plate; 141. Locking slot; 142. First mounting block; 143. Second mounting block; 144. First clamping plate; 145. Second clamping plate; 146. Second clamping slot; 147. First spring; 148. Second spring; 200. Feeding rack; 201. First feeding plate; 202. Second feeding plate; 203. Second moving plate; 204. Vertical plate; 205. First lifting plate; 206. First connecting plate; 207. Connecting sleeve; 208. Connecting column; 209. Sleeve; 210. Inner sliding groove; 211. Outer sliding groove; 212. Through groove; 213. Synchronous belt; 214. Synchronous pulley; 215. First clamping plate; 216. Second clamping plate; 217. Clamping groove; 218. Second connecting plate; 219. Carrier tray; 220. Positioning block; 221. Material tray; 222. Material trough; 223. Outer slot; 224. Inner slot; 300. Transfer frame; 301. Transfer plate; 302. Second lifting plate; 303. Lifting block; 304. First mounting surface; 305. Second cylinder mounting plate; 306. Second rotary cylinder; 307. Third mounting block; 308. Second mounting surface; 309. Finger cylinder; 310. Clamping plate; 311. Tool mounting seat; 312. Tool; 400. Connecting rod body; 401. Base; 402. First threaded hole; 403. Second threaded hole; 404. Through hole. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0019] like Figure 6 The diagram shown is a schematic flow chart of the mass production method of the battery frame connecting rod of the present invention.

[0020] Step 1: The raw material bar is placed into the cold forging die through a conveying assembly and then cold forged step by step (the raw material bar is usually 6110A aluminum alloy). Figure 10 The diagram shows a transfer assembly between adjacent cold forging dies. The transfer assembly is set between two adjacent sets of cold forging dies, clamping and transferring workpieces between the adjacent cold forging dies. The transfer assembly eliminates manual handling, improving handling efficiency and safety.

[0021] The first moving plate 129 is slidably mounted on the cold forging machine platform and located between two adjacent sets of cold forging dies. The cold forging machine platform is equipped with a sliding rail and slider mechanism that cooperates with each other. The first moving plate 129 is fixed to the top of the slider by screws. The cold forging machine platform is equipped with a driving component (such as a linear module, cylinder, ball screw, or other commercially available conventional driving component) connected to the first moving plate 129, which is used to drive the first moving plate 129 to reciprocate between the two adjacent sets of cold forging dies, thereby transferring the workpiece between the adjacent cold forging dies (the sliding rail and slider mechanism improves the stability of the reciprocating movement of the first moving plate 129).

[0022] The first cylinder mounting plate 130 is fixed to the top of the first moving plate 129 by screws. The cylinder body of the first rotary cylinder 131 is fixed to the first cylinder mounting plate 130 by screws. The clamping arm 132 is fixed to the rotating part of the first rotary cylinder 131. The clamping unit is fixed on the side of the clamping arm 132 away from the first rotary cylinder 131. The clamping unit clamps the workpiece, and then, driven by the first rotary cylinder 131 and the first moving plate 129, the workpiece is transferred to the adjacent cold forging die for subsequent cold forging.

[0023] like Figure 11-13 The diagram shows the structure of the clamping unit, which includes a clamping block 133, guide rods 134, a first clamping block 135, a second clamping block 136, a rotary motor 137, a locking pin 138, a rotating plate 139, a locking groove 140, a first mounting block 141, a second mounting block 142, a first clamping plate 143, a first clamping groove 144, a second clamping plate 145, a second clamping groove 146, a first spring 147, and a second spring 148. The clamping block 133 is fixed to the bottom of the clamping arm 132 on the side away from the first rotary cylinder 131 by screws. There are at least two guide rods 134, which are fixed at intervals to the bottom of the clamping block 133. The first clamping block 135 and the second clamping block 136 are sleeved on the guide rod 134 (the first clamping block 135 and the second clamping block 136 are provided with guide holes that cooperate with the guide rod 134. The guide rod 134 and the guide holes cooperate with each other to guide the moving first clamping block 135 and the second clamping block 136, thereby improving the stability of the reciprocating movement of the first clamping block 135 and the second clamping block 136).

[0024] There are two clamping posts 138, one vertically fixed to the top of the first clamping block 135 and the other vertically fixed to the top of the second clamping block 136. A rotating plate 139 is rotatably mounted on the bottom of the clamping block 133. The housing of the rotary motor 137 is fixed to the top of the clamping block 133 by screws. The motor shaft of the rotary motor 137 passes through the clamping block 133 and is connected to the rotating plate 139, driving the rotating plate 139 to rotate. A slot 140 passes through the rotating plate 139, and the clamping post 138 is engaged within the slot 140. The slot 140 is a strip-shaped groove. When the rotary motor 137 rotates the rotating plate 139, the slot 140 pushes the clamping post 138, thereby causing the first clamping block 135 and the second clamping block 136 to open to the sides or move inwards simultaneously.

[0025] The first mounting block 141 is fixed to one side of the first clamping block 135 by screws, and the second mounting block 142 is fixed to one side of the second clamping block 136 by screws. The first mounting block 141 and the second mounting block 142 are located on the same side of the clamping block 133. There are two first clamping plates 143, which are fixed to the side of the first mounting block 141 away from the first clamping block 135 by screws. The first clamping plates 143 are spaced apart in the vertical direction. The second clamping plate 145 is fixed to the side of the second mounting block 142 away from the second clamping block 136 by screws, and the horizontal projection of the second clamping plate 145 is located between the two first clamping plates 143.

[0026] The first clamping groove 144 is arc-shaped and located on the side of the first clamping plate 143 near the second clamping plate 145. The second clamping groove 146 is arc-shaped and located on the side of the second clamping plate 145 near the first clamping plate 143. The workpiece is clamped and transferred by the first clamping groove 144 and the second clamping groove 146. Since the horizontal projection of the second clamping plate 145 is located between the two first clamping plates 143, the two first clamping plates 143 and the second clamping plate 145 form a three-point clamping system during clamping, which makes the clamping more secure and prevents the workpiece from falling during the transfer process.

[0027] The two ends of the first spring 147 are respectively installed between the first clamping block 135 and the clamping block 133, and the two ends of the second spring 148 are respectively installed between the second clamping block 136 and the clamping block 133. Both the first spring 147 and the second spring 148 are tension springs. When the rotating plate 139 rotates clockwise, it causes the first clamping block 135 and the second clamping block 136 to open outwards simultaneously. At this time, the first spring 147 and the second spring 148 on both sides are stretched. When clamping, the rotating plate 139 rotates counterclockwise, and the first clamping block 135 and the second clamping block 136 move inwards simultaneously, and the product is clamped by the first clamping plate 143 and the second clamping plate 145 on both sides. At this time, the first spring 147 and the second spring 148 are still in a certain stretched state. Under the reverse force of the tension springs, a pulling force is applied to the first clamping plate 143 and the second clamping plate 145 towards the workpiece, which further improves the firmness of the workpiece clamping and prevents the workpiece from falling off during the transfer process.

[0028] like Figure 7-9 The diagram shows the structure of a cold forging die. The conveying assembly clamps the workpiece and transfers it between adjacent cold forging dies. The cold forging die then cold forges the workpiece step-by-step, facilitating subsequent machining by machine tools. Figure 2 The leftmost part in the process diagram is the semi-finished workpiece after cold forging. (For example...) Figure 7As shown, there are multiple sets of cold forging dies, which sequentially perform cold forging on the raw material bar. By deforming in multiple steps and in small amounts, the deformation amount in each step is within the range that the material can withstand, which greatly reduces the impact and wear on each die set, significantly improves the service life of the dies, and thus reduces production costs.

[0029] The lower auxiliary plate 100 is fixed to the cold forging machine table by bolts. A through slot is opened in the middle of the lower auxiliary plate 100 along the vertical direction. The lower auxiliary plate pad 101 is embedded in the through slot in the middle of the lower auxiliary plate 100. The lower auxiliary plate pad 101 rests against the top of the cold forging machine table. During cold forging, the downward pressure applied from above acts on the lower auxiliary plate pad 101 at the bottom in stages to avoid damaging the lower auxiliary plate 100 and causing it to deform, thereby affecting the cold forging effect.

[0030] The lower mold base 103 is fixed to the top of the lower auxiliary platen 100 by screws. The lower mold base pad groove extends vertically through the lower mold base 103, and the lower mold base pad 104 is installed in the lower mold base pad groove and abuts against the lower auxiliary platen pad 101 below. Figure 8 As shown, the lower die holder pad groove is a stepped groove. Therefore, during installation, the stepped lower die holder pad 104 is directly inserted into the lower die holder pad groove and then abuts against the lower auxiliary plate pad 101. During cold forging, the downward pressure applied from above acts on the lower die holder pad 104, and then disperses to the lower die holder 103 and the lower auxiliary plate pad 101, avoiding pressure concentration that could cause deformation of the cold forging die.

[0031] The lower die limiting post 105 is vertically fixed to the top of the lower die base 103 by screws. The lower die limiting post 105 cooperates with the upper die limiting post 117 at the bottom of the upper die base 115. During cold forging, the upper die base 115 descends. At this time, the upper die limiting post 117 at the bottom of the upper die base 115 descends synchronously until the upper die limiting post 117 abuts against the lower die limiting post 105, thus avoiding excessive descent and damage to the cold forging die.

[0032] The outer guide sleeve 106 is vertically fixed to the top of the lower die base 103. The outer guide sleeve 106 cooperates with the outer guide post 118 at the bottom of the upper die base 115. During cold forging, the upper die base 115 descends. At this time, the outer guide post 118 at the bottom of the upper die base 115 descends synchronously within the outer guide sleeve 106. By setting the mutually cooperating outer guide sleeve 106 and outer guide post 118, the accuracy of the descent position of the upper die base 115 is improved, thereby improving the effect of cold forging.

[0033] The lower cylinder body 107 is fixed to the top of the lower die base 103 by screws. The lower cylinder body 107 is hollow inside and is used to install structures such as the lower pad 108. There are multiple lower pads 108, which are stacked and fixed on top of the lower die base pad block 104 and located inside the lower cylinder body 107. The lower die sleeve 111 is inserted into the lower cylinder body 107 and abuts against the top of the uppermost lower pad 108. The lower die core 112 is inserted into the lower die sleeve 111 from bottom to top. During the cold forging process, the lower die core 112 needs to withstand high radial pressure. The lower die sleeve 111 covers the outside of the lower die core 112 to prevent the lower die core 112 from cracking under stress.

[0034] The lower mold locking ring 114 is fitted from top to bottom onto the lower mold sleeve 111 and the lower cylinder body 107, and is fixed to the lower cylinder body 107, such as... Figure 8 As shown, the lower die locking ring 114 and the lower die sleeve 111 are installed through a stepped groove. During cold forging, the cold forging process is completed instantaneously, which generates a huge impact force. This force is not only downward and outward, but also has a reverse tendency to "push" the lower die sleeve 111 out of the die holder. At this time, the lower die locking ring 114 can press the lower die sleeve 111 tightly into the lower cylinder 107 to prevent the lower die sleeve 111 from being pushed out.

[0035] like Figure 8 As shown, the inner cavity of the lower die sleeve 111 is provided with a "draft angle," meaning that the inner cavity of the lower die sleeve 111 is not a cylindrical groove, but rather has an isosceles trapezoidal shape (i.e., the top diameter of the inner cavity of the lower die sleeve 111 is smaller than the bottom diameter). During installation, the lower die core 112 is inserted into the inner cavity of the lower die sleeve 111 from bottom to top. The lower die core 112 mates with the inner cavity of the lower die sleeve 111. Therefore, during cold forging, the lower die sleeve 111 is pressed tightly against the lower cylinder body 107 by the lower die locking ring 114, preventing the lower die sleeve 111 from being ejected. At the same time, the design of the inclined wall of the inner cavity of the lower die sleeve 111 locks the lower die core 112 inside the lower die sleeve 111, preventing the lower die core 112 from being ejected.

[0036] The first mold cavity 113 is located at the top of the lower mold core 112. During cold forging, the raw material bar is initially cold-forged into shape within the first mold cavity 113. The lower ejector rod 102 is vertically and vertically inserted into the lower auxiliary plate pad 101 and the lower mold base pad 104 (a lifting cylinder connected to the lower ejector rod 102 is installed at the bottom of the cold forging machine, which is used to drive the lower ejector rod 102 to rise, thereby ejecting the product after initial cold forging, making it convenient for the transport components to clamp and pick up the ejected semi-finished workpiece).

[0037] Multiple first ejector rods 109 are fixed to the top of the lower ejector rod 102 and pass vertically through the lower pad 108. A second ejector rod 110 is fixed to the top of the first ejector rods 109 and located within the first mold cavity 113 of the lower die core 112. During cold forging, the upper punch 123 descends to cold forge the raw material bar. The raw material bar is deformed under pressure within the first mold cavity 113. After initial cold forging, the bar rests between the second ejector rod 110 and the upper punch 123, supported at the bottom of the bar during cold forging by the second ejector rod 110. The second ejector rod 110 then ejects the formed product, facilitating the handling assembly to clamp and remove the ejected semi-finished workpiece.

[0038] The upper die holder 115 is mounted on the slide block of an external cold forging machine. A large slide block is driven by the power mechanism of the external cold forging machine (such as a crankshaft or connecting rod) to reciprocate up and down, thereby causing the upper die holder 115 to reciprocate and complete the cold forging of the workpiece. A through slot is vertically oriented in the middle of the upper die holder 115. An upper die holder pad 116 is installed within this slot. During cold forging, the upward counterforce acts on the upper die holder pad 116, preventing damage to the upper die holder 115 and thus ensuring the cold forging effect.

[0039] The upper cylinder body 120 is fixed to the bottom of the upper mold base 115 by screws. The upper pad 119 is installed inside the upper cylinder body 120 and abuts against the bottom of the upper mold base pad 116. The upper clamping plate 121 is installed inside the upper cylinder body 120 and abuts against the bottom of the upper pad 119. The upper mold locking ring 122 is fitted onto the upper clamping plate 121 and the bottom of the upper cylinder body 120 and is fixed to the upper cylinder body 120. Figure 8 As shown, the upper clamping plate 121 and the upper die locking ring 122 are installed through a stepped groove. During cold forging, the cold forging process is completed instantaneously, which generates a huge reverse impact force. This force not only moves upward and outward, but also has a reverse tendency to "push" the upper clamping plate 121 out of the die holder. At this time, the upper die locking ring 122 can hold the upper clamping plate 121 tightly inside the upper cylinder body 120 to prevent the upper clamping plate 121 from being pushed out.

[0040] The upper punch 123 is installed inside the upper clamping plate 121, and the upper punch 123 and the upper clamping plate 121 are installed through a stepped groove to prevent the upper punch 123 from falling out after cold forging.

[0041] like Figure 7 As shown, there are multiple sets of cold forging dies. The conveying component clamps the workpiece and transfers it between adjacent cold forging dies. The cold forging dies perform cold forging on the workpiece in sequence. By deforming in multiple steps and in small amounts, the deformation amount of each step is within the range that the material can withstand, which greatly reduces the impact and wear on each set of dies, significantly improves the service life of the dies, and thus reduces production costs.

[0042] like Figure 7 As shown, the first two sets of cold forging dies have the same structure, differing only in the size of the first internal cavity 113, thus sequentially cold forging the raw material bar. The first two sets of cold forging dies are used to shape the workpiece (in actual cold forging, the number of cold forging dies used for shaping the workpiece is not limited to two sets; the number can be appropriately increased according to the shape, size, and degree of material deformation of the product). The last set of cold forging dies is used to press an inner hole at one end of the workpiece (the inner hole pressed at one end of the last set of dies is...). Figure 1 (The position of the first threaded hole 402).

[0043] like Figure 9 As shown, the lower die structure of the last set of cold forging dies is the same as that of the first two sets of cold forging dies. In the last set of cold forging dies, the bottom of the upper die base 115 is fixed with two opposing limiting plates 124 by screws. The limiting plates 124 are L-shaped. The wear-resistant plate 125 is fixed to the opposite side of the two limiting plates 124 by screws. The wear-resistant plate 125 is L-shaped.

[0044] The slide plate 126 is slidably installed between two wear-resistant plates 125. A drive cylinder connected to the slide plate 126 is installed on one side of the upper die base 115 in the last set of cold forging dies. The drive cylinder moves the slide plate 126. The fixing block 127 is fixed to the bottom of the slide plate 126 by screws. The punch 128 is fixed to the bottom of the fixing block 127. The punch 128 and the fixing block 127 are installed together by a stepped groove structure to prevent the punch 128 from falling off. The preceding cold forging die cold forges the bar stock to form the shape of the workpiece. The last set of cold forging dies punches holes in the formed workpiece to form a semi-finished workpiece. Figure 2 The leftmost part in the process diagram is the semi-finished workpiece after cold forging.

[0045] Step 2: Perform solution treatment on the workpiece after cold forging in Step 1: Solution treatment involves heating the workpiece in a furnace, raising the temperature from room temperature to 510–550°C over 1 hour (ideally 530°C; excessively high solution temperatures can lead to a sharp decline in strength, plasticity, and toughness, resulting in surface peeling or deformation; excessively low solution temperatures can lead to insufficient strength and hardness). Maintaining the solution temperature at 530°C improves the material's plasticity and toughness, ensuring sufficient dissolution of the reinforcing phase while avoiding defects such as overheating, coarse crystals, surface oxidation, or deformation caused by excessively high temperatures, and also avoiding insufficient dissolution of the reinforcing phase and substandard mechanical properties caused by excessively low temperatures). The workpiece is then held at this temperature for 3 hours, followed by extreme water cooling for 1.5–2.5 minutes (ideally 2 minutes to avoid overcooling, which, while ensuring supersaturation, introduces significant internal stress and defects, and short cooling results in incomplete supersaturated solid solutions, leading to uneven performance).

[0046] A supersaturated solid solution is obtained through solution treatment to eliminate work hardening from cold forging, restore the machinability of the material, and create the necessary microstructure prerequisites for subsequent aging strengthening treatment. At this time, the workpiece temperature is about 120℃.

[0047] Step 3: Perform aging treatment on the workpiece after solution treatment in Step 2, and then cool it; during the aging treatment, through the microscopic means of "precipitation", the material can obtain excellent performance such as high strength and high hardness while maintaining a certain toughness, and stabilize its microstructure and properties.

[0048] The aging treatment involves heating the workpiece in a furnace for 3 hours, raising the temperature from room temperature to 160–190°C (preferably 175°C to avoid over-aging, which would reduce strength and hardness, or insufficient strengthening effect due to low temperature; by controlling the temperature at 175°C, the most numerous, best-sized, and most diffusely distributed strengthening phases can be formed, thus achieving peak strength), and holding at this temperature for 8 hours. The cooling in step two is natural cooling (i.e., naturally cooling the workpiece in the furnace to room temperature). Natural cooling is mainly to prevent the introduction of new internal stress and deformation, and to ensure a smooth and complete precipitation process, ultimately obtaining stable and uniform material properties.

[0049] Step 4: Place the pre-treated workpiece from Step 3 onto the feeding structure on one side of the machine tool, such as... Figure 17 , 18The diagram shows a schematic of the feeding structure, which is used to receive pre-processed semi-finished workpieces. The feeding rack 200 is fixed to the processing machine table with screws. The outer slide rail is fixed to the top of the feeding rack 200 at intervals with screws. The outer slider is slidably mounted on the outer slide rail. The second feeding plate 202 is fixed to the top of the outer slider with screws. By setting the mutually cooperating outer slide rail and outer slider, the sliding stability of the second feeding plate 202 is improved, thereby improving the stability of the feeding process.

[0050] The inner slide rail is fixed to the bottom inner side of the feeding frame 200 by screws, and the inner slide rail is parallel to the outer slide rail. The inner slider is slidably mounted on the inner slide rail. The second moving plate 203 is fixed to the top of the inner slider by screws. The cooperation of the inner slide rail and the inner slider improves the stability of the reciprocating movement of the second moving plate 203, thereby improving the stability of the feeding process. The upright plate 204 is vertically fixed to the top of the second moving plate 203 by welding. To improve the structural strength between the upright plate 204 and the second moving plate 203, reinforcing ribs are fixed between the included angle formed by the upright plate 204 and the second moving plate 203.

[0051] The first lifting plate 205 and the upright plate 204 are connected by a vertically arranged slide rail slider mechanism to improve the stability of the lifting movement of the first lifting plate 205. The first connecting plate 206 is fixed to the top of the first lifting plate 205 by screws and extends to one side. The connecting sleeve 207 is fixed to the bottom of the first connecting plate 206 by screws, and the first feeding plate 201 is fixed to the top of the first connecting plate 206. When the second moving plate 203 moves, it drives the first feeding plate 201 above it to move synchronously.

[0052] The connecting post 208 passes through the connecting sleeve 207 and is fixed together with the connecting sleeve 207. Sleeves 209 are rotatably mounted on both ends of the connecting post 208 via bearings. An inner sliding groove 210 is formed on the side wall of the feeding rack 200, and an outer sliding groove 211 is formed on the side wall of the feeding rack 200 and connected to the inner sliding groove 210. The outer sliding groove 211 extends upward from both sides of the inner sliding groove 210, and the outer sliding groove 211 is smoothly connected to the inner sliding groove 210. The height of the outer sliding groove 211 is equal to the height of the inner sliding groove 210, and the sleeves 209 at both ends of the connecting post 208 are located between the outer sliding groove 211 and the inner sliding groove 210. When the drive unit moves the second moving plate 203, the sleeves 209 at both ends of the connecting column 208 move along the trajectory of the outer slide groove 211 and the inner slide groove 210, thereby causing the first feeding plate 201 to descend during the movement, which is offset from the running trajectory of the upper second feeding plate 202, thus avoiding interference and collision between the first feeding plate 201 and the second feeding plate 202.

[0053] Since the sleeve 209 and the connecting column 208 are connected by bearings at both ends, the sleeve 209 rolls along the tracks of the outer slide groove 211 and the inner slide groove 210, resulting in less friction between them and thus more stable movement of the first feed plate 201.

[0054] Bearing seats are installed at intervals on the inner bottom of the feeding rack 200 by screw fastening. The synchronous pulley 214 is rotatably installed in the bearing seat via a rotating shaft. The synchronous belt 213 is wound around the synchronous pulley 214. A servo motor connected to the synchronous pulley 214 is installed on the top of the bearing seat. The servo motor drives the synchronous pulley 214 to rotate, which in turn drives the synchronous belt 213 to rotate. (The outer circumferential surface of the synchronous pulley 214 is provided with tooth grooves. The inner circumferential surface of the synchronous belt 213 is integrally connected with a tooth structure that matches the tooth grooves. Relying on the meshing of the two, the synchronous belt 213 is prevented from slipping and the synchronicity of the alternating movement of the first feeding plate 201 and the second feeding plate 202 is ensured.)

[0055] like Figure 19 As shown, the first clamping plate 215 is located inside the synchronous belt 213, and the second clamping plate 216 is located outside the synchronous belt 213. The first clamping plate 215 and the second clamping plate 216 are fixed together by bolts and nuts. The first clamping plate 215 and the second clamping plate 216 clamp the synchronous belt 213 from both sides. When the synchronous belt 213 rotates, it drives the first clamping plate 215 and the second clamping plate 216 to move. The clamping groove 217 passes through the first clamping plate 215 at intervals. The clamping groove 217 cooperates with the toothed structure on the inner side of the synchronous belt 213. The toothed structure on the inner side of the synchronous belt 213 is inserted into the clamping groove 217 to prevent slippage between the first clamping plate 215 and the second clamping plate 216 and the synchronous belt 213, and to ensure the synchronicity of the staggered movement of the first feed plate 201 and the second feed plate 202.

[0056] Two second connecting plates 218 are fixed to the top of the second clamping plate 216. One second clamping plate 216 is fixed to the upright plate 204, and the other second clamping plate 216 passes through the through groove 212 on the side wall of the feeding rack 200 and is fixed to the second feeding plate 202. When the servo motor drives the synchronous pulley 214 to rotate, it will drive the synchronous belt 213 to rotate. Under the action of the first clamping plate 215, the second clamping plate 216, and the second connecting plate 218, the first feeding plate 201 and the second feeding plate 202 are driven to move back and forth alternately, thereby sending the material tray 221 carrying the semi-finished workpiece to the picking station, which is convenient for the transfer structure to clamp and put into the processing machine tool for processing.

[0057] like Figure 20As shown, the carrier tray 219 is fixed to the top of the first feeding plate 201 and the second feeding plate 202 by screws. The positioning blocks 220 are fixed to the four corners of the top of the carrier tray 219 by screws. The positioning blocks 220 are L-shaped, and the right angles of the L-shaped positioning blocks 220 are set. The positioning blocks 220 are used to position the placed material tray 221 to prevent the material tray 221 from shaking during the transfer process, thereby affecting the accuracy of the subsequent workpiece clamping position.

[0058] Material slots 222 are spaced apart on the top of material tray 221 and parallel to the length of material tray 221. Outer slots 223 are spaced apart on both sides of material slots 222 along the length of material slots 222 and penetrate material tray 221 vertically to engage the ends of inserted workpieces, preventing workpieces from rolling off and affecting subsequent clamping during transfer. Inner slots 224 are spaced apart on the top of material tray 221 and connect material slots 222 and outer slots 223, with the remaining parts of the workpiece held in the inner slot 224.

[0059] Step 5: Transfer the workpiece between the feeding structure and the machine tool using the transfer structure; like Figure 14 , 15 The diagram shows a schematic of the transfer structure, which is used to clamp workpieces from the material tray 221 and place them inside the machine tool, or to clamp machined workpieces from the machine tool and place them on the material tray 221. The transfer frame 300 is fixed to the workshop floor by bolts and is erected above the machine tool to transfer workpieces between the machine tool and the material tray 221, thereby completing the processing of the workpieces.

[0060] The transfer plate 301 is movably mounted on one side of the top of the transfer frame 300 (an X-axis linear module connected to the transfer plate 301 is mounted on the top of the transfer frame 300, which drives the transfer plate 301 to reciprocate, thereby transferring the workpiece between the machine tool and the material tray 221). The second lifting plate 302 is movably mounted on the side of the transfer plate 301 away from the transfer frame 300 (a Z-axis linear module connected to the second lifting plate 302 is mounted on one side of the transfer plate 301, which drives the second lifting plate 302 to descend, thereby transferring the clamped workpiece).

[0061] like Figure 15 As shown, the lifting block 303 is fixed to the bottom of the second lifting plate 302, and the first mounting surface 304 is inclinedly opened at the bottom of the lifting block 303. The angle between the first mounting surface 304 and the horizontal plane is 45°. By setting the inclined first mounting surface 304 at the bottom of the lifting block 303, the clamped workpiece can be changed horizontally or vertically.

[0062] The second cylinder mounting plate 305 is fixed to the first mounting surface 304 at the bottom of the lifting block 303 by screws. The cylinder body of the second rotary cylinder 306 is fixed to the second cylinder mounting plate 305 by screws. The third mounting block 307 has an inclined second mounting surface 308 on the side near the second rotary cylinder 306, and the angle between the second mounting surface 308 and the horizontal plane is 45°. The second mounting surface 308 of the third mounting block 307 is fixed to the rotating part of the second rotary cylinder 306.

[0063] There are two sets of finger cylinders 309, which are fixed on the bottom and side of the third mounting block 307. The finger cylinders 309 are used to clamp the workpiece to be processed and the workpiece processed inside the machine tool.

[0064] To facilitate the explanation of the pickup process, such as Figure 15 As shown, the finger cylinder in the vertical position is finger cylinder A, and the finger cylinder in the horizontal position is finger cylinder B. When transferring the workpiece, finger cylinder A first clamps the workpiece on the material tray 221 (at this time, the workpiece to be processed is in a horizontal position). Then, the second rotary cylinder 306 drives finger cylinder A to rotate to a horizontal position (at this time, the workpiece on finger cylinder A is rotated to a vertical position, while finger cylinder B is rotated to a vertical position). After moving into the processing machine tool, finger cylinder B clamps the workpiece processed on one side of the chuck 310 (the workpiece processed on finger cylinder B is...). The finished workpiece is in a horizontal position. Then, the second rotary cylinder 306 drives the finger cylinder B to rotate to a horizontal position (at this time, the workpiece on finger cylinder B is in a vertical position, while finger cylinder A is rotated to a vertical position, and the workpiece to be processed on finger cylinder A is in a horizontal position, making it easy to insert into the chuck 310 on one side). When the finished workpiece is rotated out, the second rotary cylinder 306 drives the finger cylinder B to rotate to a vertical position. At this time, the finished workpiece on finger cylinder B is in a horizontal position, and it can be directly placed on the material tray 221. By designing the clamping component to drive the workpiece to switch back and forth between horizontal and vertical positions, the transfer of the workpiece between the material tray 221 and the processing machine tool can be satisfied.

[0065] like Figure 16 The diagram shows the internal structure of the machine tool. A chuck 310 is fixed to the inside of the machine tool; a commercially available three-jaw chuck is used. A three-axis moving mechanism is installed inside the machine tool, and a mounting plate is vertically fixed to the three-axis moving mechanism. A rotary cylinder is mounted on one side of the mounting plate, and a tool mount 311 is fixed to the rotating part of the rotary cylinder. Multiple sets of machining tools 312 are circumferentially fixed to one side of the tool mount 311 by screws. Through the cooperation of the three-axis moving mechanism and the rotary cylinder, different tools 312 can be selected when different machining processes are required on the workpiece.

[0066] Step Six: The workpiece is machined by the cutting tool 312 inside the machine tool. like Figure 2-4 The diagram shows the machining process of the battery frame connecting rod (the shaded area represents the machining part of the corresponding process). The battery frame connecting rod is completed in four steps, and the four steps correspond to four different machining tools. With the cooperation of the feeding structure and the transfer structure, the workpiece is transferred between different machining tools, thereby completing the machining of the workpiece.

[0067] like Figure 2 As shown, the first step is to drill holes in the semi-finished workpiece after cold forging. The drilling positions are as follows: Figure 1 The location of the through hole is determined by using a 14mm diameter alloy drill bit in this drilling process, where S=3000 and F=0.2 (S is the spindle speed and F is the feed rate). Next, the workpiece is drilled again, at the location of the drill hole. Figure 1 The first threaded hole 402 is located at the position where only an inner hole is initially cold-forged during the cold forging process. Therefore, a U-drill with a diameter of 31mm is needed to drill the hole at this location, where S=3000 and F=0.1. Next, the outer diameter and end face of the workpiece are machined, such as... Figure 2 As shown, rough machining is performed on the outer peripheral surface of the base 401 and the side of the base 401 away from the connecting rod body 400. The cutting tool used is DCGT11T304AP, where S=3000 and F=0.4. Next, the inner hole of the workpiece is precision machined with a chamfer, such as... Figure 2 As shown, the chamfered part of the inner hole is on the side of the through hole 404 near the first threaded hole 402. The cutting tool used is DCGT11T304AP, where S=3000 and F=0.1. Next, the inner hole of the workpiece is precision machined with a chamfer, such as... Figure 2 As shown, the chamfered part of the inner hole is on the side of the first threaded hole 402 away from the through hole 404, which facilitates the screwing in of external fasteners. The cutting tool used is TPGH090204G-PCD, where S=3000 and F=0.15. like Figure 3 As shown, the process first involves drilling a hole in the workpiece at the location of the second threaded hole 403, which connects to the through hole 404. The tool used is a U-drill with a diameter of 19.5 mm, where S=3000 and F=0.2. Next, the end face of the workpiece is machined, such as... Figure 3 As shown, the end face here is the side of the connecting rod body 400 away from the base 401, and the cutting tool used is DCGT11T304AP, where S=3000 and F=0.2; Next, rough threading is performed on the workpiece. The thread position here is the location of the second threaded hole 403. The tool used is (SINR2016S-16)16IR150ISO GW15, where S=700 and F=2.5. Next, the inner hole of the workpiece is chamfered by precision machining. The chamfered part of the inner hole is on the side of the second threaded hole 403 away from the through hole 404, which facilitates the screwing in of external fasteners. The tool used is TPGH090204G-PCD, where S=3000 and F=0.15. Next, the workpiece is precision threaded. The thread position here is the position of the second threaded hole 403. The tool used is (SINR2016S-16)16IR150ISO GW15, where S=700 and F=2.5. like Figure 4 As shown, the process first involves rough machining the outer diameter and end face of the workpiece. These locations are the outer circumferential surface of the connecting rod body, the side of the base near the connecting rod body, and the side of the connecting rod body away from the base. The cutting tool used is DCGT11T304AP, where S=3000 and F=0.3. Next, the outer diameter of the workpiece is precision machined. The precision machined part is the outer circumferential surface of the connecting rod body. The tool used is DCGT11T304AP, where S=3000 and F=0.2. Next, the workpiece is grooved. The groove is cut on the side of the connecting rod body away from the base. The cutting tool used is WGGN200-H0001, where S=2000 and F=0.1. like Figure 5 As shown, the process first involves threading the workpiece. The thread position here is where the second threaded hole 403 is located. The thread size is M22*2.5. The cutting tool used is (SINR2016S-16)16IR150ISO GW15, where S=800 and F=1.5. Next, the outer diameter and end face of the workpiece are precision machined. The machining location here is the outer circumference of the base and the side of the base away from the connecting rod body. The tool used is DCGT11T304AP, where S=5000 and F=0.2. Next, the inner hole of the workpiece is chamfered by precision machining. The chamfer is located on the side of the first threaded hole 402 away from the through hole 404. The tool used is TPGH090204G-PCD, where S=5000 and F=0.2 (the chamfer was already done in the first step of the process, but because threading will leave burrs and incomplete tooth profiles at the chamfer, it is necessary to chamfer again to remove the burrs left by threading).

[0068] Next, the workpiece is milled flat. The machining location here is the side of the base near the connecting rod body and both sides of the base. The tool used is a Φ15.0 milling cutter, where S=4000 and F=1300. This completes all machining steps of the workpiece. It is then removed by the transfer structure and placed on the material tray 221 on the side of the machining tool.

[0069] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for mass manufacturing of battery frame connecting rods, characterized in that, It includes the following steps: Step 1: The material is placed into the cold forging die through a series of transfer components and then cold forged step by step. Step 2: Perform solution treatment on the workpiece after cold forging in Step 1; Step 3: Perform aging treatment on the workpiece after solution treatment in Step 2, and then cool it; Step 4: Place the pre-treated workpiece from Step 3 onto the feeding structure on one side of the machine tool; Step 5: Transfer the workpiece between the feeding structure and the machine tool using the transfer structure; Step Six: The workpiece is machined by the cutting tools inside the machine tool.

2. The method for mass manufacturing of a battery frame connecting rod according to claim 1, characterized in that: In step two, the solution treatment involves heating from room temperature to 510–550°C over 1 hour, holding at that temperature for 3 hours, and then immersing in water for extreme cooling for 1.5–2.5 minutes.

3. The method for mass manufacturing of a battery frame connecting rod according to claim 1, characterized in that: The aging treatment in step three involves raising the furnace temperature from room temperature to 160-190°C over 3 hours and holding it at that temperature for 8 hours; the cooling in step two is natural cooling.

4. The method for mass manufacturing of a battery frame connecting rod according to claim 1, characterized in that: The conveying assembly in step one includes a first movable plate (129) movably disposed between two adjacent sets of cold forging dies, a clamping arm (132) rotatably mounted on the top of the first movable plate (129), and a clamping unit fixed to the end of the clamping arm (132).

5. The method for mass manufacturing of a battery frame connecting rod according to claim 1, characterized in that: The cold forging die in step one includes a lower die base (103), a lower die core (112) fixed on the top of the lower die base (103), a first die cavity (113) opened on the top of the lower die core (112), an upper die base (115) movably disposed above the lower die base (103), an upper punch (123) fixed at the bottom of the upper die base (115) and cooperating with the first die cavity (113), a push rod movably passing through the lower die core (112), a lower die locking mechanism disposed on the outside of the lower die core (112), and an upper die locking mechanism disposed on the outside of the upper punch (123).

6. The method for mass manufacturing of a battery frame connecting rod according to claim 5, characterized in that: The lower mold locking mechanism includes a lower cylinder (107) fixed to the top of the lower mold base (103), a lower mold sleeve (111) installed in the lower cylinder (107), and a lower mold locking ring (114) fixed to the top of the lower cylinder (107) for pressing the lower mold sleeve (111). The lower mold core (112) is fitted inside the lower mold sleeve (111) and engages with the inclined surface of the lower mold sleeve (111). The upper mold locking mechanism includes an upper cylinder (120) fixed to the bottom of the upper mold base (115), an upper clamping plate (121) installed in the upper cylinder (120), and an upper mold locking ring (122) fixed to the bottom of the upper cylinder (120) for pressing the upper clamping plate (121). The upper punch (123) is fitted inside the upper clamping plate (121) and engages with the upper clamping plate (121) in a stepped manner.

7. A method for mass manufacturing a battery frame connecting rod according to claim 4, characterized in that: The clamping unit includes a clamping block (133) fixed on the clamping arm (132), a first clamping block (135) and a second clamping block (136) movably installed in the clamping block (133), a first clamping plate (143) fixed on one side of the first clamping block (135) and spaced apart, a second clamping plate (145) fixed on one side of the second clamping block (136), a first clamping groove (144) opened inside the first clamping plate (143), and a second clamping groove (146) opened inside the second clamping plate (145). The horizontal projection of the second clamping plate (145) falls in the middle of the first clamping plate (143).

8. A method for mass manufacturing a battery frame connecting rod according to claim 1, characterized in that: The feeding structure in step four includes a transfer frame (300), a first feeding plate (201) and a second feeding plate (202) that are alternately and movably installed on the top of the transfer frame (300), a loading assembly fixed on the top of the first feeding plate (201) and the second feeding plate (202), and a clearance assembly disposed in the transfer frame (300) for driving the first feeding plate (201) to avoid the second feeding plate (202), wherein the workpiece is placed on the loading assembly.

9. A method for mass manufacturing a battery frame connecting rod according to claim 1, characterized in that: The transfer structure in step five includes a transfer frame (300) mounted on the processing machine table, a transfer plate (301) movably mounted on the top of the transfer frame (300), a second lifting plate (302) movably mounted on one side of the transfer plate (301), and a clamping assembly fixed to the bottom of the second lifting plate (302). The clamping assembly is used to clamp the workpiece and drive the workpiece to switch back and forth between horizontal and vertical states.

10. A method for mass manufacturing a battery frame connecting rod according to claim 9, characterized in that: The gripping assembly includes a lifting block (303) fixed to the bottom of the second lifting plate (302), a first mounting surface (304) inclinedly disposed at the bottom of the lifting block (303), a mounting block (307) rotatably mounted on the first mounting surface (304), and finger cylinders (309) fixed on both sides of the mounting block (307). The rotation axis of the mounting block (307) is perpendicular to the first mounting surface (304).

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