Power recovery device forming mold

Abstract

The application relates to the technical field of power recovery devices, and discloses a power recovery device forming die, which comprises a rough punching mechanism and a fine punching mechanism. The rough punching mechanism comprises a first upper die assembly, a first punch assembly, a first lower die assembly, a first support assembly and a first support positioning assembly. The first support positioning assembly comprises a first center positioning shaft, a first unloading ejector pin and a first positioning pin. When rough trimming is performed for the first time, the first positioning pin provides support for the first punched part. When rough trimming is performed for the second time, the first positioning pin positions the second punched part in the horizontal direction, and the first unloading ejector pin provides support for the second punched part. The fine punching mechanism is used for fine trimming of the third punched part. The second punched part is positioned by using the height difference of the top surfaces of the first unloading ejector pin and the first positioning pin. All rough trimming processes can be completed by using one rough punching mechanism, the operation process is simpler and more convenient, one rough punching mechanism is saved, and the manufacturing cost of the die is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of energy recovery devices, and more specifically, to molds for energy recovery devices. Background Technology

[0002] High-strength new energy vehicles are usually equipped with energy recovery devices. These devices recover braking energy, excess engine power, and energy generated during deceleration, converting them into electrical energy for storage and reuse. This improves the overall energy efficiency of the vehicle and reduces energy waste.

[0003] Existing as Figure 1 The first stamped part shown can be rough-cut using a one-time stamping method to obtain the following result: Figure 3 The third stamping part shown will subject the lower die holder to a large impact force, easily damaging it and significantly reducing the die's lifespan. Existing power recovery device forming dies typically place the first stamping part into the first roughing mechanism, controlling the first roughing mechanism to roughly trim the edges of the first stamping part, resulting in... Figure 2 The second stamped part is shown below. It is then removed and placed into the second rough stamping mechanism, where it is positioned. The second rough stamping mechanism is then controlled to perform rough trimming on the second stamped part again, resulting in the third stamped part. The third stamped part is then removed and placed into the fine stamping mechanism, where it is controlled to perform fine trimming on the third stamped part, resulting in the third stamped part shown below. Figure 4 The power recovery device shown has a complicated operation process and requires two roughing mechanisms and one fineing mechanism to complete the cutting and forming of the power recovery device, resulting in high mold manufacturing costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a power recovery device molding die with a relatively simple operation process and low mold manufacturing cost.

[0005] To achieve the above objectives, the technical solution of the present invention is to provide a molding die for a power recovery device, comprising: The roughing mechanism includes a first upper die assembly, a first punch assembly connected to the first upper die assembly, a first lower die assembly corresponding to the first upper die assembly, a first support assembly connected to the first lower die assembly, and a first support and positioning assembly connected to the first lower die assembly. The first support and positioning assembly includes a first central positioning shaft, first ejector pins arranged in a circumferential array around the first central positioning shaft, and first positioning pins symmetrically distributed around the first central positioning shaft. The bottom ends of the first ejector pins and the first positioning pins are each connected to a first return spring disposed in the first lower die assembly and the first support assembly. In its natural state, the top surface of the first positioning pin is higher than the top surface of the first unloading ejector pin. The first central positioning shaft is used to position the first stamping part or the second stamping part in the axial direction. When the first rough trimming is performed, the first positioning pin provides support for the first stamping part. When the second rough trimming is performed, the first positioning pin engages with at least a portion of the first trimming groove of the second stamping part to position the second stamping part in a horizontal position. The first unloading ejector pin provides support for the second stamping part. The fine blanking mechanism, located on one side of the rough blanking mechanism, is used to finely cut the edges of the third stamped part.

[0006] By using the forming mold of the power recovery device described in this invention, during the rough trimming process, it is no longer necessary to remove the second stamping part from one rough stamping mechanism and then put it into another rough stamping mechanism for rough trimming. All rough trimming processes can be completed using one rough stamping mechanism, making the operation process simpler and more convenient. Only one rough stamping mechanism and one fine stamping mechanism are needed to complete the trimming and forming of the power recovery device, saving one rough stamping mechanism, greatly reducing the manufacturing cost of the mold, and improving the economic efficiency of producing the power recovery device. Furthermore, when controlling the separation of the first upper mold assembly and the first lower mold assembly, the first positioning pin or the first ejector pin will lift the second stamping part or the third stamping part to demold, making it convenient for the operator to rotate the second stamping part or remove the third stamping part, thus improving production efficiency.

[0007] Preferably, the first lower die assembly includes a first lower die pad connected to the first support assembly, a first lower die template connected to the top of the first lower die pad, and multiple first lower die ducts installed on the first lower die template. The first lower die template has a first lower die cutting edge corresponding to the first punch assembly. The air outlet of the first lower die duct faces the first lower die cutting edge. A first central positioning shaft is fixed to the first lower die template. The first lower die template is provided with a first lower die receiving groove coaxially arranged with the first central positioning shaft. The first lower die receiving groove is used to receive the second dome at the bottom of the first stamped part, the second stamped part, or the third stamped part. The first lower die pad has a first through groove corresponding to the first lower die cutting edge. The shape of the first through groove is the same as that of the first lower die cutting edge, and the size of the first through groove is larger than that of the first lower die cutting edge. This design facilitates the discharge of waste and iron filings generated during rough cutting through the first through groove, ensuring the cleanliness of the top surface of the first lower die template and preventing iron filings from affecting the quality and accuracy of the rough cutting edge.

[0008] Preferably, the first punch assembly includes two first punches A and B, both connected to the first upper die assembly. Two first punches A and two first punches B are provided, with the two first punches A and the two first punches B symmetrically distributed about the first central positioning axis. The shapes of the first punches A and B are identical to the corresponding first lower die cutting edges, and the dimensions of the first punches A and B are smaller than the dimensions of their corresponding first lower die cutting edges. The bottom end of the first punch A has a first guide knife A, and the bottom end of the first punch B has a first guide knife B. This design allows the first guide knife A and the second guide knife B to guide the first punches A and B, preventing bending deformation of the first punches A or B during the roughing process, which would result in excessively low roughing accuracy.

[0009] Preferably, the first upper die assembly includes a first upper die base, symmetrically distributed first nitrogen springs mounted on the first upper die base, a first punch pad connected to the first upper die base, a first punch fixing plate connected to the first punch pad, symmetrically distributed first upper die guide pillars connected to the first punch fixing plate, a first pressure plate connected to the first upper die base via a first unloading screw, symmetrically distributed first shock-absorbing pillars mounted on the first pressure plate, and a plurality of first upper die air ducts mounted on the first pressure plate; Both the first punch A and the first punch B are mounted on the first punch pad. The first punch fixing plate has a first limiting groove through which the first punch A and the first punch B are limited. The first upper die base has a first limiting countersunk hole corresponding to the first unloading screw. The bottom end of the first unloading screw is fixed in the first pressure plate. The first pressure plate is located below the first punch fixing plate. The first pressure plate slides with the first upper die guide post. The first nitrogen spring separates the first pressure plate from the first punch fixing plate. The first pressure plate has a first guide groove corresponding to the first punch A and the first punch B. The air outlet of the first upper die air duct faces the first guide groove. The first pressure plate is provided with a first upper die receiving groove corresponding to the first lower die receiving groove. The first upper die receiving groove is used to receive the first dome at the top of the first stamping part, the second stamping part, or the third stamping part.

[0010] This design allows the second or third stamped part to be uniformly pressed during the forming process, improving the dimensional accuracy and surface quality of the second or third stamped part, and facilitating demolding of the second or third stamped part.

[0011] Preferably, the first support assembly includes a first lower base plate, multiple first lower pads connected to the first lower base plate, a first lower die base connected to the first lower pads, and a first limiting post A connected to the first lower die base. A first lower die pad is mounted on the first lower die base. A first discharge groove corresponding to a first through slot is passed through the first lower die base. The shape of the first discharge groove is the same as that of the first through slot, but the size of the first discharge groove is larger than that of the first through slot. A first limiting post B corresponding to the first limiting post A is mounted on the first upper die base. The first limiting post A and the first limiting post B are used to limit the distance between the first upper die assembly and the first lower die assembly when they are closed. This design protects the first stamped part, the second stamped part, and the third stamped part from being crushed.

[0012] Preferably, the fine blanking mechanism includes a second upper die assembly, a second punch assembly connected to the second upper die assembly, a second lower die assembly corresponding to the second upper die assembly, a second support assembly connected to the second lower die assembly, and a second support and positioning assembly connected to the second lower die assembly. The second support and positioning assembly includes a second central positioning shaft, second ejector pins arranged in a circumferential array around the second central positioning shaft, and second positioning pins symmetrically distributed around the second central positioning shaft. The bottom end of the second ejector pin is connected to a second return spring disposed in the second lower die assembly and the second support assembly, and the second positioning pins are fixed on the second lower die assembly. In its natural state, the top surface of the second positioning pin is higher than the top surface of the second ejector pin. The second central positioning shaft is used to position the third stamping part axially. When the edge is finely cut, the second positioning pin engages with the first cutting groove or the second cutting groove at the non-finely cut edge of the third stamping part to position the third stamping part horizontally. The second ejector pin provides support for the third stamping part.

[0013] By using the fine stamping mechanism described in this invention, the third stamping part can be quickly positioned, shortening the positioning time. Furthermore, when the second upper die assembly and the second lower die assembly are separated, the second ejector pin will lift the power recovery device to demold, making it easier for the operator to remove the power recovery device and improving production efficiency.

[0014] Preferably, the second lower die assembly includes a second lower die pad connected to the second support assembly, a second lower die template connected to the top of the second lower die pad, and multiple second lower die ducts installed on the second lower die template. The second lower die template has a second lower die cutting edge corresponding to the second punch assembly. The air outlet of the second lower die duct faces the second lower die cutting edge. The second central positioning shaft and the second positioning pin are both fixed on the second lower die template. The second lower die template is provided with a second lower die receiving groove coaxially arranged with the second central positioning shaft. The second lower die receiving groove is used to accommodate the second dome at the bottom of the third stamping part or the power recovery device. The second lower die pad has a second through groove corresponding to the second lower die cutting edge. The shape of the second through groove is the same as that of the second lower die cutting edge, and the size of the second through groove is larger than that of the second lower die cutting edge. This design facilitates the discharge of waste and iron filings generated during precision cutting through the second through groove, ensuring the cleanliness of the top surface of the second lower die template and preventing iron filings from affecting the quality and accuracy of the precision cutting edge.

[0015] Preferably, the second punch assembly includes four second punches A arranged in a circumferential array around the second central positioning axis. All four second punches A are connected to the second upper die assembly. The shape and size of the second punches A are identical to those of the corresponding second lower die cutting edges. The bottom end of each second punch A has a second guide blade A. This design allows the second guide blade A to guide the second punches A, preventing them from bending or deforming during the initial trimming process, which could prevent them from smoothly pressing into the second lower die cutting edges.

[0016] Preferably, the second upper die assembly includes a second upper die base, symmetrically distributed second nitrogen springs mounted on the second upper die base, a second punch pad connected to the second upper die base, a second punch fixing plate connected to the second punch pad, symmetrically distributed second upper die guide pillars connected to the second punch fixing plate, a second pressure plate connected to the second upper die base via a second unloading screw, symmetrically distributed second shock-absorbing pillars mounted on the second pressure plate, and a plurality of second upper die air ducts mounted on the second pressure plate; The second punch A is mounted on the second punch pad. The second punch fixing plate has a second limiting groove for limiting the second punch A. The second upper die base has a second limiting countersunk hole corresponding to the second unloading screw. The bottom end of the second unloading screw is fixed in the second pressure plate. The second pressure plate is located below the second punch fixing plate. The second pressure plate slides with the second upper die guide post. The second nitrogen spring separates the second pressure plate from the second punch fixing plate. The second pressure plate has a second guide groove corresponding to the second punch A. The air outlet of the second upper die air duct faces the second guide groove. The second pressure plate is provided with a second upper die receiving groove corresponding to the second lower die receiving groove. The second upper die receiving groove is used to receive the first dome at the top of the third stamping part or the power recovery device.

[0017] This design allows the energy recovery device to be uniformly pressed during the forming process, which helps to reduce defects such as deformation, warping and wrinkles, improve the dimensional accuracy and surface quality of the energy recovery device, and facilitate demolding.

[0018] Preferably, the second support assembly includes a second lower base plate, multiple second lower pads connected to the second lower base plate, a second lower die base connected to the second lower pads, and a second limiting post A connected to the second lower die base. A second lower die pad is mounted on the second lower die base, and a second discharge groove corresponding to the second through groove runs through the second lower die base. The shape of the second discharge groove is the same as that of the second through groove, but the size of the second discharge groove is larger than that of the second through groove. A second limiting post B corresponding to the second limiting post A is mounted on the second upper die base. The second limiting post A and the second limiting post B are used to limit the distance between the second upper die assembly and the second lower die assembly when they are closed. This design protects the third stamping part and the power recovery device from being crushed.

[0019] The beneficial effects of this invention are as follows: 1. By using the forming mold of the power recovery device described in this invention, after the first stamping part is rough-trimmed and the second stamping part is formed, the second stamping part can be manually rotated and positioned by utilizing the height difference between the top surfaces of the first ejector pin and the first positioning pin. The second stamping part can then continue to be rough-trimmed. There is no need to remove the second stamping part from one roughing mechanism and put it into another roughing mechanism for rough trimming. All rough trimming processes can be completed using one roughing mechanism, making the operation process simpler and more convenient. Only one roughing mechanism and one fine stamping mechanism are needed to complete the trimming and forming of the power recovery device, saving one roughing mechanism, greatly reducing the manufacturing cost of the mold, and improving the economic efficiency of producing the power recovery device.

[0020] 2. By using the power recovery device forming mold described in this invention, after the rough trimming is completed, when the first upper mold assembly and the first lower mold assembly separate, the first punch A and the first punch B will retract into the first guide groove of the first pressure plate, and the first positioning pin or the first ejector pin will lift the second stamping part or the third stamping part, which is convenient for demolding and allows the operator to rotate the second stamping part or remove the third stamping part. After the fine trimming is completed, when the second upper mold assembly and the second lower mold assembly separate, the second punch A will retract into the second guide groove of the second pressure plate, and the second ejector pin will lift the power recovery device, which is convenient for demolding and allows the operator to remove the power recovery device, greatly improving production efficiency. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the first stamped part; Figure 2This is a three-dimensional structural diagram of the second stamping formed by the rough cutting edge of the first stamping part; Figure 3 This is a three-dimensional structural diagram of the third stamping formed by the rough cutting edge of the second stamping part; Figure 4 This is a three-dimensional structural diagram of the power recovery device formed by the precision cutting edge of the third stamping part; Figure 5 This is a schematic diagram of the first three-dimensional structure of the molding die for a power recovery device; Figure 6 This is a schematic diagram of the second type of three-dimensional structure of the molding die for the power recovery device; Figure 7 This is a schematic front sectional view of the roughing mechanism; Figure 8 This is a three-dimensional structural diagram of the first lower mold assembly and the first support and positioning assembly; Figure 9 This is a schematic diagram of the three-dimensional structure of the first template; Figure 10 This is a three-dimensional structural diagram of the first lower mold base plate; Figure 11 This is a schematic diagram of the first three-dimensional structure of the first punch A and the first punch B; Figure 12 This is a schematic diagram of the second three-dimensional structure of the first punch A and the first punch B; Figure 13 This is a three-dimensional structural diagram of the first punch fixing plate; Figure 14 This is a three-dimensional structural diagram of the first pressure plate; Figure 15 This is a front sectional view of the first upper die assembly and the first punch assembly; Figure 16 This is a three-dimensional structural diagram of the first punch assembly and part of the first upper die assembly; Figure 17 This is a three-dimensional structural breakdown diagram of the first supporting component; Figure 18 This is a schematic front sectional view of the fine blanking mechanism; Figure 19 This is a three-dimensional structural diagram of the second lower mold assembly and the second support positioning assembly; Figure 20 This is a schematic diagram of the three-dimensional structure of the second template; Figure 21 This is a schematic diagram of the three-dimensional structure of the second lower mold base plate; Figure 22 This is a three-dimensional structural diagram of punch A; Figure 23 This is a three-dimensional structural diagram of the second punch fixing plate; Figure 24 This is a three-dimensional structural diagram of the second pressure plate; Figure 25 This is a schematic front sectional view of the second upper die assembly and the second punch assembly; Figure 26 This is a three-dimensional structural diagram of the second punch assembly and part of the second upper die assembly; Figure 27 This is a three-dimensional structural breakdown diagram of the second support component; Figure 28 This is a process flow diagram (top view) of the formation of the power recovery device. Figure 29 This is a schematic diagram showing the fit between the first stamped part and the mold in the first step. Figure 30 This is a schematic diagram of the fit between the second stamping part and the mold in the second step (before the second stamping part rotates). Figure 31 This is a schematic diagram of the fit between the second stamping part and the mold in the third step (after the second stamping part has rotated). Figure 32 This is a schematic diagram showing the fit between the third stamping part and the mold in step four; Figure 33 This is a schematic diagram showing the fit between the third stamping part and the mold in step five; Figure 34 This is a schematic diagram showing the interaction between the power recovery device and the mold in step six.

[0022] In the diagram: 100, rough stamping mechanism; 200, fine stamping mechanism; 300, first stamping part; 400, second stamping part; 500, third stamping part; 600, power recovery device; 110. First upper die assembly; 111. First upper die base; 1111. First limiting countersunk hole; 1112. First limiting post B; 1113. First upper die guide sleeve; 112. First nitrogen spring; 113. First punch pad; 114. First punch fixing plate; 1141. First limiting groove; 115. First upper die guide post; 116. First stripper screw; 117. First pressure plate; 1171. First guide groove; 1172. First upper die receiving groove; 118. First shock absorber post; 119. First upper die duct; 120. First punch assembly; 121. First punch A; 1211. First guide blade A; 12111. First guide surface; 12112. Second guide surface; 122. First punch B; 1221. First guide blade B; 130. First lower mold assembly; 131. First mounting hole; 132. First lower mold pad; 1321. First through groove; 133. First lower mold template; 1331. First lower mold cutting edge; 1332. First lower mold receiving groove; 1333. First lower mold guide sleeve; 134. First lower mold air duct; 135. First position sensor; 140. First support assembly; 141. First lower base plate; 142. First lower pad; 1421. First guide groove; 143. First lower mold base; 1431. First discharge groove; 144. First limiting post A; 145. First lower mold guide post; 146. Detection plate; 1461. First groove; 1462. Second groove; 1463. Third groove; 150. First support and positioning assembly; 151. First central positioning shaft; 152. First unloading ejector pin; 153. First positioning pin; 154. First return spring; 210. Second upper die assembly; 211. Second upper die base; 2111. Second limiting countersunk hole; 2112. Second limiting post B; 2113. Second upper die guide sleeve; 212. Second nitrogen spring; 2121. Push rod; 213. Second punch pad; 214. Second punch fixing plate; 2141. Second limiting groove; 215. Second upper die guide post; 216. Second unloading screw; 217. Second pressure plate; 2171. Second guide groove; 2172. Second upper die receiving groove; 2173. Blind hole; 218. Second shock absorber post; 219. Second upper die duct; 220. Second punch assembly; 221. Second punch A; 2211. Second guide knife A; 230. Second lower mold assembly; 231. Second mounting hole; 232. Second lower mold pad; 2321. Second through groove; 233. Second lower mold template; 2331. Second lower mold cutting edge; 2332. Second lower mold receiving groove; 2333. Second lower mold guide sleeve; 234. Second lower mold air duct; 235. Second position sensor; 240. Second support assembly; 241. Second lower base plate; 242. Second lower pad; 2421. Second guide groove; 243. Second lower mold base; 2431. Second discharge groove; 244. Second limit post A; 245. Second lower mold guide post; 250. Second support and positioning assembly; 251. Second center positioning shaft; 252. Second unloading ejector pin; 253. Second positioning pin; 254. Second return spring; 410. First cutting groove; 411. First notch; 412. Second notch; 413. Third notch; 414. Fourth notch; 510. Second cutting groove; 511. Fifth notch; 512. Sixth notch; 513. Seventh notch; 514. Eighth notch; 611. First main body; 612. Second main body; 613. Third main body; 614. Fourth main body; 620. First dome; 630. Second dome; Arrow MN points in the radial direction; arrow PQ points in the tangential direction. Detailed Implementation

[0023] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed to enable those skilled in the art to better understand and implement the subject matter described herein. Changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0024] To better understand this invention, the following is combined with... Figures 1-34 The molding die for the power recovery device of the present invention will be described in detail.

[0025] Example 1: like Figures 1-8 As shown, the molding die for the energy recovery device includes: The roughing mechanism 100 includes a first upper die assembly 110, a first punch assembly 120 connected to the first upper die assembly 110, a first lower die assembly 130 corresponding to the first upper die assembly 110, a first support assembly 140 connected to the first lower die assembly 130, and a first support and positioning assembly 150 connected to the first lower die assembly 130. The first support and positioning assembly 150 includes a first central positioning shaft 151, first ejector pins 152 arranged in a circumferential array around the first central positioning shaft 151, and first positioning pins 153 symmetrically distributed around the first central positioning shaft 151. The bottom ends of the first ejector pins 152 and the first positioning pins 153 are each connected to a first return spring 154 disposed in the first lower die assembly 130 and the first support assembly 140. In its natural state, the top surface of the first positioning pin 153 is higher than the top surface of the first unloading ejector pin 152. The first central positioning shaft 151 is used to position the first stamping part 300 or the second stamping part 400 axially. During the first rough trimming, the first positioning pin 153 provides support for the first stamping part 300. During the second rough trimming, the first positioning pin 153 engages with at least a portion of the first trimming groove 410 of the second stamping part 400 to position the second stamping part 400 in a horizontal position. The first unloading ejector pin 152 provides support for the second stamping part 400. The fine blanking mechanism 200 is located on one side of the rough blanking mechanism 100 and is used to finely cut the edges of the third stamped part 500.

[0026] It should be noted that the roughing mechanism 100 is installed on a punch press, and the punch press provides power to drive the first upper die assembly 110 and the first punch assembly 120 to move, and cooperate with the first lower die assembly 130 to rough cut the first stamped part 300 or the second stamped part 400; the first lower die assembly 130 has a first mounting hole 131 for mounting the first return spring 154, and the first mounting hole 131 extends into the interior of the first support assembly 140, and the bottom end of the first return spring 154 is fixed in the first mounting hole 131; after the first stamped part 300 is rough cut, a first cutting groove 410 is formed, and after the second stamped part 400 is rough cut, a second cutting groove 510 is formed.

[0027] In this embodiment, the top end of the first central positioning shaft 151 is provided with an angle, and the inclined surface provided by the angle serves as a guide to facilitate the rapid axial positioning of the first stamping part 300; the first ejector pin 152 is configured with inner and outer layers, the inner layer of the first ejector pin 152 provides support for the middle part of the first stamping part 300 or the second stamping part 400, and the outer layer of the first ejector pin 152 provides support for the edge part of the first stamping part 300 or the second stamping part 400, and more first ejector pins 152 can provide stronger thrust to lift the second stamping part 400 or the third stamping part 500 for demolding; the longitudinal section of the first mounting hole 131, the first ejector pin 152 and the first positioning pin 153 are all inverted T-shaped, and in their natural state, in the first composite Under the thrust of the positioning spring 154, the first unloading ejector pin 152 and the first positioning pin 153 are both at their maximum height. The top surfaces of the symmetrically distributed first positioning pins 153 are on the same horizontal plane, and the top surfaces of the circumferentially distributed first unloading ejector pins 152 are on the same horizontal plane. The top surface of the first positioning pin 153 is higher than the top surface of the first unloading ejector pin 152. Based on the shape of the first trimming groove 410, in order to use fewer first positioning pins 153 to perform more accurate positioning of the second stamping part 400, the first positioning pin 153 is engaged with the first trimming groove 410 at the non-precision trimming edge of the second stamping part 400. The first trimming groove 410 at the non-precision trimming edge is the part of the first trimming groove 410 that will not be trimmed. Two first positioning pins 153 are provided.

[0028] The first stamping part 300 is placed on the first support and positioning assembly 150. The first upper die assembly 110 and the first punch assembly 120 are controlled to press down to rough cut the first stamping part 300. After the first stamping part 300 is rough cut, the first cutting groove 410 is formed, and the second stamping part 400 is obtained. During this process, the first upper die assembly 110 presses down on the first stamping part 300, pushing the first stamping part 300 to press down on the first positioning pin 153 and the first ejector pin 152 until the bottom surface of the first stamping part 300 is in contact with the top surface of the first lower die assembly 130, and the first return spring 154 is compressed.

[0029] After the first rough trimming is completed, the first upper mold assembly 110 and the first lower mold assembly 130 are separated. During this process, the first return spring 154 extends, pushing the first positioning pin 153 and the first ejector pin 152 to move upward. The first positioning pin 153 lifts up the obtained second stamping part 400.

[0030] Then, the second stamping part 400 is manually rotated so that the first positioning pin 153 engages with the first cutting groove 410 at the non-precision cut edge of the second stamping part 400. At this time, the second stamping part 400 falls under its own weight, and the bottom surface of the second stamping part 400 is in contact with the top surface of the multiple first unloading ejector pins 152. The multiple first unloading ejector pins 152 provide support for the second stamping part 400, and the first positioning pin 153 positions the second stamping part 400 in a horizontal position.

[0031] Then, the first upper die assembly 110 and the first punch assembly 120 are pressed down again to rough cut the second stamping part 400. After the second stamping part 400 is rough cut, a second cutting groove 510 is formed, resulting in the third stamping part 500. During this process, the first upper die assembly 110 presses down the first stamping part 300 and the first positioning pin 153, and pushes the first stamping part 300 to press down the first ejector pin 152 until the bottom surface of the second stamping part 400 is in contact with the top surface of the first lower die assembly 130, and the first return spring 154 is compressed.

[0032] After the second roughing is completed, the first upper mold assembly 110 and the first lower mold assembly 130 are separated. During this process, the first reset spring 154 extends and pushes the first positioning pin 153 and the first ejector pin 152 to move upward. The first ejector pin 152 lifts up the obtained third stamping part 500 and removes the third stamping part 500.

[0033] During the rough trimming process, there is no need to remove the second stamping part 400 from one roughing mechanism 100 and then put it into another roughing mechanism 100 for rough trimming. All rough trimming processes can be completed using one roughing mechanism 100, making the operation process simpler and more convenient. Only one roughing mechanism 100 and one fine stamping mechanism 200 are needed to complete the trimming of the power recovery device 600, saving one roughing mechanism 100, greatly reducing the manufacturing cost of the mold, and improving the economic efficiency of producing the power recovery device 600. Furthermore, when controlling the separation of the first upper mold assembly 110 and the first lower mold assembly 130, the first positioning pin 153 or the first ejector pin 152 will lift the second stamping part 400 or the third stamping part 500 to demold, making it easier for the operator to rotate the second stamping part 400 or remove the third stamping part 500, thus improving production efficiency.

[0034] Example 2: As an optimization of Example 1, such as Figures 1-10As shown, the first lower mold assembly 130 includes a first lower mold pad 132 connected to the first support assembly 140, a first lower template 133 connected to the top of the first lower mold pad 132, and a plurality of first lower mold air ducts 134 installed on the first lower template 133. The first lower template 133 has a first lower mold cutting edge 1331 corresponding to the first punch assembly 120. The air outlets of the first lower mold air ducts 134 face the first lower mold cutting edge 1331. The first central positioning shaft 151 is fixed on the first lower template 133. The plate 133 is provided with a first lower die receiving groove 1332 coaxially arranged with the first central positioning shaft 151. The first lower die receiving groove 1332 is used to receive the second dome 630 at the bottom of the first stamping part 300, the second stamping part 400, or the third stamping part 500. The first lower die pad plate 132 is provided with a first through groove 1321 corresponding to the first lower die cutting edge 1331. The first through groove 1321 has the same shape as the first lower die cutting edge 1331, and the size of the first through groove 1321 is larger than the size of the first lower die cutting edge 1331.

[0035] It should be noted that the first stamping part 300, the second stamping press, the third stamping part 500, and the power recovery device 600 all include a main body, a first dome 620 connected to the top of the main body, and a second dome 630 connected to the bottom of the main body. The outer diameter of the second dome 630 is larger than the outer diameter of the first dome 620. The first cutting groove 410 and the second cutting groove 510 are both formed on the main body. The main body of the first stamping part 300 is the first main body 611, the main body of the second stamping part 400 is the second main body 612, the main body of the third stamping part 500 is the third main body 613, and the main body of the power recovery device 600 is the fourth main body 614.

[0036] In this embodiment, multiple first lower mold air ducts 134 are arranged in a fan shape to blow off iron filings at different positions on the first lower mold plate 133. A first position sensor 135 is also installed on the first lower mold plate 133. The opening and closing of the first lower mold air ducts 134 is controlled by a first solenoid valve. The first position sensor 135 is electrically connected to the first solenoid valve. The first position sensor 135 can be an inductive sensor or a capacitive sensor. When the first upper mold assembly 110 and the first lower mold assembly 130 are closed for rough trimming, the bottom surface of the first body 611 of the first stamping part 300 or the second body 612 of the second stamping part 400 is in contact with the top surface of the first lower mold plate 133.

[0037] When the first position sensor 135 detects that the first upper mold assembly 110 and the first lower mold assembly 130 are separating, the first position sensor 135 transmits an electrical signal to the first solenoid valve, the first solenoid valve opens, and the first lower mold air duct 134 starts blowing air, blowing the iron filings on the top surface of the first lower mold plate 133 into the first lower mold cutting edge 1331 and causing them to fall. When the first position sensor 135 detects that the first upper mold assembly 110 and the first lower mold assembly 130 are closing, the first position sensor 135 transmits the opposite electrical signal to the first solenoid valve, the first solenoid valve closes, and the first lower mold air duct 134 stops blowing air.

[0038] By setting up an automatic first lower die air duct 134, the operator's operation process can be reduced, cleaning time can be saved, and production efficiency can be improved. The first through groove 1321 is designed to have the same shape as the first lower die cutting edge 1331. The size of the first through groove 1321 is larger than the size of the first lower die cutting edge 1331, which is conducive to the waste and iron filings generated by the rough cutting edge falling through the first through groove 1321, ensuring the cleanliness of the top surface of the first lower die template 133, and preventing iron filings residue from affecting the quality and accuracy of the rough cutting edge.

[0039] Example 3: As an optimization of Example 2, such as Figure 2 , Figure 6 , Figure 11 , Figure 12 As shown, the first punch assembly 120 includes a first punch A121 and a first punch B122, both connected to the first upper die assembly 110. There are two of each first punch A121 and first punch B122. The two first punches A121 and the two first punches B122 are symmetrically distributed about the axis of the first central positioning axis 151. The shapes of the first punches A121 and B122 are the same as those of the corresponding first lower die cutting edge 1331. The dimensions of the first punches A121 and B122 are smaller than the dimensions of the corresponding first lower die cutting edge 1331. The bottom end of the first punch A121 has a first guide knife A1211, and the bottom end of the first punch B122 has a first guide knife B1221.

[0040] Before the first punches A121 and B122 rough-cut the first stamped part 300 or the second stamped part 400, the first guide cutters A1211 and B1221 first enter the corresponding first lower die cutting edge 1331. During the process of the first punches A121 and B122 moving down to rough-cut the first stamped part 300 or the second stamped part 400, the outer sides of the first guide cutters A1211 and B1221 slide against the inner wall of the first lower die cutting edge 1331, providing a guiding function for the first punches A121 and B122. The outer guide surface of the first guide cutter A1211 includes a flat first guide surface 12111 and arc-shaped second guide surfaces 12112 located at both ends of the first guide surface 12111. The first guide surface 12111 and the second guide surface 12112 are connected. The first guide surface 12111 can slide with the inner wall of the first lower cutting edge 1311 to restrict the first punch A121 from shifting away from the first central positioning axis 151, thereby ensuring the accuracy of the rough cutting edge in the radial direction. The second guide surface 12112 can slide with the inner wall of the first lower cutting edge 1311 to restrict the first punch A121 from shifting in the tangential direction (the tangential direction is perpendicular to the radial direction), thereby ensuring the accuracy of the rough cutting edge in the tangential direction. Through this design, the first punch A121 is accurately guided from at least three directions, further improving the accuracy of the rough cutting edge. The first guide knife A1211 has a similar structural design, which will not be described in detail here.

[0041] By setting the first guide knife A1211 and the second guide knife B, the first punch A121 or the first punch B122 can be prevented from bending and deforming during the rough cutting process, which would result in the rough cutting accuracy being too low and the qualified power recovery device 600 being unable to be obtained through fine cutting.

[0042] Example 4: As an optimization of Example 3, such as Figure 5 , Figure 6 , Figure 7 , Figure 9 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16As shown, the first upper die assembly 110 includes a first upper die base 111, first nitrogen springs 112 symmetrically distributed on the first upper die base 111, a first punch pad 113 connected to the first upper die base 111, a first punch fixing plate 114 connected to the first punch pad 113, first upper die guide pillars 115 symmetrically distributed on the first punch fixing plate 114, a first pressure plate 117 connected to the first upper die base 111 via a first unloading screw 116, first shock-absorbing pillars 118 symmetrically distributed on the first pressure plate 117, and a plurality of first upper die air ducts 119 installed on the first pressure plate 117. Both the first punch A121 and the first punch B122 are mounted on the first punch pad 113. The first punch fixing plate 114 has a first limiting groove 1141 for limiting the first punch A121 and the first punch B122. The first upper die holder 111 has a first limiting countersunk hole 1111 corresponding to the first unloading screw 116. The bottom end of the first unloading screw 116 is fixed in the first pressure plate 117. The first pressure plate 117 is located below the first punch fixing plate 114. The first pressure plate 117 is slidably engaged with the first upper die guide post 115. The first nitrogen spring 112 separates the first pressure plate 117 from the first punch fixing plate 114. The first pressure plate 117 has a first guide groove 1171 corresponding to the first punch A121 and the first punch B122. The air outlet of the first upper die air duct 119 faces the first guide groove 1171. The first pressure plate 117 is provided with a first upper die receiving groove 1172 corresponding to the first lower die receiving groove 1332. The first upper die receiving groove 1172 is used to receive the first dome 620 at the top of the first stamping part 300, the second stamping part 400, or the third stamping part 500.

[0043] It should be noted that the first upper mold base 111 limits the range of motion of the first unloading screw 116 by the first limiting countersunk hole 1111, thereby limiting the distance between the first pressure plate 117 and the first upper mold base 111 and preventing the first pressure plate 117 from falling off.

[0044] In this embodiment, the first lower mold plate 133 is provided with a first lower mold guide sleeve 1333 corresponding to the first upper mold guide post 115. The first lower mold guide sleeve 1333 guides the first upper mold guide post 115, ensuring the matching accuracy of the first upper mold assembly 110 and the first lower mold assembly 130, thereby improving the accuracy of the rough cutting edge. Multiple first upper mold air ducts 119 are distributed in a fan shape to blow off iron filings at different positions on the first pressure plate 117. The first upper mold air ducts 119 and the first lower mold air ducts 134 are staggered. The opening and closing of the first upper mold air ducts 119 are also controlled by the first solenoid valve. The first position sensor 135 can transmit an electrical signal to the first solenoid valve to control the opening and closing of the first upper mold air ducts 119 and the first lower mold air ducts 134 at the same time.

[0045] When roughing the edges of the first stamped part 300 or the second stamped part 400, the first upper die assembly 110 moves downward, the first upper die guide post 115 enters the first lower die guide sleeve 1333, and the first pressure plate 117 first contacts the top surface of the first body 611 of the first stamped part 300 or the second body 612 of the second stamped part 400. The first upper die base 111 and the first pressure plate 117 jointly compress the first nitrogen spring 112, compressing the first nitrogen spring 112 and providing thrust to the first pressure plate 117. The first pressure plate 117 then pushes the first stamped part 300 or the second stamped part downward. 400, until the bottom surface of the first body 611 of the first stamping part 300 or the second body 612 of the second stamping part 400 is in contact with the top surface of the first lower template 133, then the position of the first pressure plate 117 remains unchanged, the other parts of the first upper die assembly 110 continue to move down, the first nitrogen spring 112 continues to compress, the first punch A121 and the first punch B122 extend out of the first guide groove 1171 of the first pressure plate 117 and cooperate with the first lower die cutting edge 1331 of the first lower template 133 to rough cut the first stamping part 300 or the second stamping part 400.

[0046] When the first upper mold assembly 110 and the first lower mold assembly 130 separate, the first nitrogen spring 112 extends, the position of the first pressure plate 117 remains unchanged, the other parts of the first upper mold assembly 110 move upward, and the first punch A121 and the first punch B122 retract into the first guide groove 1171 of the first pressure plate 117. When the other parts of the first upper mold assembly 110 move upward to a certain height, the first upper mold base 111 pulls the first pressure plate 117 upward synchronously through the first unloading screw 116.

[0047] The opening and closing control principle of the first upper mold air duct 119 is the same as that of the first lower mold air duct 134 in Embodiment 2, and will not be repeated here.

[0048] The first damping column 118 can absorb and reduce the impact and vibration generated during the stamping process when the first upper die assembly 110 and the first lower die assembly 130 are closed, ensuring the stability and safety of the stamping process and extending the service life of the mold. The first nitrogen spring 112 can play a buffering role during the stamping and trimming process, so that the second stamping part 400 or the third stamping part 500 is uniformly pressed during the forming process, which helps to reduce defects such as deformation, warping and wrinkles of the second stamping part 400 or the third stamping part 500, and improve the dimensional accuracy and surface quality of the second stamping part 400 or the third stamping part 500. When the first upper die assembly 110 and the first lower die assembly 130 are separated, the first nitrogen spring 112 will push the first pressure plate 117 to move. This design allows the first punches A121 and B122 to retract into the first guide groove 1171 of the first pressure plate 117, facilitating the demolding of the second stamping part 400 or the third stamping part 500. Without this structural design, the second stamping part 400 or the third stamping part 500 would easily get stuck on the first punch assembly 120. During the stamping process, the first upper die guide post 115 guides the first pressure plate 117, and the first guide groove 1171 guides the first punches A121 and B122, ensuring the positional accuracy of the rough cutting edge. The first upper die air duct 119 can blow off the iron filings attached to the bottom surface of the first pressure plate 117, ensuring the cleanliness of the bottom surface of the first pressure plate 117 and preventing iron filings residue from affecting the quality and accuracy of the rough cutting edge.

[0049] Example 5: As an optimization of Example 4, such as Figure 5 , Figure 6 , Figure 16 , Figure 17 As shown, the first support assembly 140 includes a first lower base plate 141, a plurality of first lower pads 142 connected to the first lower base plate 141, a first lower mold base 143 connected to the first lower pads 142, and a first limiting post A144 connected to the first lower mold base 143. A first lower mold pad 132 is installed on the first lower mold base 143. A first discharge groove 1431 corresponding to the first through groove 1321 is passed through the first lower mold base 143. The shape of the first discharge groove 1431 is the same as the shape of the first through groove 1321, and the size of the first discharge groove 1431 is larger than the size of the first through groove 1321. A first limiting post B1112 corresponding to the first limiting post A144 is installed on the first upper mold base 111. The first limiting post A144 and the first limiting post B1112 are used to limit the distance between the first upper mold assembly 110 and the first lower mold assembly 130 when they are closed.

[0050] It should be noted that the bottom ends of the multiple first lower pads 142 are fixedly connected to the first base plate, and the top ends of the multiple first lower pads 142 are fixedly connected to the first lower mold base 143.

[0051] In this embodiment, to provide stable support for the whole, the first lower pads 142 are arranged in a linear array. The first pads at the first discharge groove 1431 are provided with first guide grooves 1421 to facilitate the falling of waste or iron filings onto the first base plate. The first lower die base 143 is equipped with a first lower die guide post 145, and the first upper die base 111 is provided with a first upper die guide sleeve 1113 corresponding to the first lower die guide post 145. The first lower die guide post 145 guides the first upper die guide sleeve 1113. Through the cooperation of the first lower die guide post 145 and the first upper die guide sleeve 1113, and the cooperation of the first upper die guide post 115 and the first lower die guide sleeve 1333, the matching accuracy of the first upper die assembly 110 and the first lower die assembly 130 is ensured. The first lower die base 143 is also equipped with a detection plate 146, which is provided with... The first groove 1461 corresponds to the first body 611 of the first stamping part 300, the second groove 1462 corresponds to the first dome 620 of the first stamping part 300, and the third groove 1463 corresponds to the second dome 630 of the first stamping part 300. The second groove 1462, the first groove 1461 and the third groove 1463 are connected vertically. The second groove 1462 has a semi-circular arc surface that can fit with the outer surface of the first dome 620, and the third groove 1463 has a semi-circular arc surface that can fit with the outer surface of the second dome 630. Since the outer diameter of the second dome 630 is larger than the outer diameter of the first dome 620, the use of the detection plate 146 helps the operator to judge the front and back of the first stamping part 300, and prevents the operator from mistakenly placing the first stamping part 300 in reverse for stamping, which would damage the mold and the first stamping part 300.

[0052] By setting the first limiting post A144 and the first limiting post B1112, the first stamping part 300, the second stamping part 400 and the third stamping part 500 can be protected from being crushed. The waste and iron filings generated by the rough cutting edge fall onto the first lower base plate 141 through the first lower die cutting edge 1331, the first through groove 1321 and the first discharge groove 1431 in sequence for centralized collection and processing.

[0053] Example 6: As a supplement to the subsequent working mechanism of Example 1, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 18 , Figure 19As shown, the fine blanking mechanism 200 includes a second upper die assembly 210, a second punch assembly 220 connected to the second upper die assembly 210, a second lower die assembly 230 corresponding to the second upper die assembly 210, a second support assembly 240 connected to the second lower die assembly 230, and a second support and positioning assembly 250 connected to the second lower die assembly 230. The second support and positioning assembly 250 includes a second central positioning shaft 251, second ejector pins 252 arranged in a circumferential array around the second central positioning shaft 251, and second positioning pins 253 symmetrically distributed around the second central positioning shaft 251. The bottom end of the second ejector pins 252 is connected to a second return spring 254 disposed in the second lower die assembly 230 and the second support assembly 240. The second positioning pins 253 are fixed on the second lower die assembly 230. In its natural state, the top surface of the second positioning pin 253 is higher than the top surface of the second unloading ejector pin 252. The second center positioning shaft 251 is used to position the third stamping part 500 at its axis. When the edge is finely cut, the second positioning pin 253 engages with the first cutting groove 410 or the second cutting groove 510 at the non-finely cut edge of the third stamping part 500 to position the third stamping part 500 in a horizontal position. The second unloading ejector pin 252 provides support for the third stamping part 500.

[0054] It should be noted that the fine blanking mechanism 200 is installed on the punch press, and the punch press provides power to drive the second upper die assembly 210 and the second punch assembly 220 to move, and cooperate with the second lower die assembly 230 to perform fine edge trimming on the third stamped part 500; the second lower die assembly 230 has a second mounting hole 231 for mounting the second return spring 254, and the second mounting hole 231 extends into the interior of the second support assembly 240, and the bottom end of the second return spring 254 is fixed in the second mounting hole 231; the second edge trimming groove 510 at the non-fine edge trimming area is the part of the second edge trimming groove 510 that will not be finely trimmed. After the fine blanking mechanism 200 performs fine edge trimming on part of the edge area of ​​the third stamped part 500, the power recovery device 600 is obtained.

[0055] In this embodiment, two second positioning pins 253 are provided, and the top ends of the second central positioning shaft 251 and the two second positioning pins 253 are all provided with bevels. The bevels provided by the bevels serve as guides to facilitate the rapid horizontal positioning of the third stamping part 500. The longitudinal sections of the second mounting hole 231, the second unloading ejector pin 252, and the second positioning pin 253 are all inverted T-shaped. In the natural state, under the thrust of the second return spring 254, the second unloading ejector pin 252 and the second positioning pin 253 are both at their maximum height. The top surfaces of the two second positioning pins 253 are on the same horizontal plane, and the top surfaces of the multiple second unloading ejector pins 252 distributed in a circumferential array are on the same horizontal plane. The top surface of the second positioning pin 253 is higher than the top surface of the second unloading ejector pin 252.

[0056] The third stamping part 500 is placed on the second support positioning assembly 250, so that the second positioning pin 253 engages with the first cutting groove 410 or the second cutting groove 510 at the non-precision cutting edge of the third stamping part 500. The second upper die assembly 210 and the second punch 220 are controlled to press down to perform precision cutting on the third stamping part 500. After the third stamping part 500 is precision cut, the power recovery device 600 is obtained. During this process, the second upper die assembly 210 presses down on the third stamping part 500 and pushes the third stamping part 500 to press down on the second ejector pin 252 until the bottom surface of the third stamping part 500 is in contact with the top surface of the second lower die assembly 230, and the second return spring 254 is compressed.

[0057] After the precision cutting is completed, the second upper mold assembly 210 and the second lower mold assembly 230 are separated. During this process, the second return spring 254 extends and pushes the second ejector pin 252 to move upward. The second ejector pin 252 lifts up the obtained power recovery device 600 and removes the power recovery device 600.

[0058] The second positioning pin 253 and the second central shaft can be used to quickly position the third stamping part 500, shortening the positioning time. When the second upper mold assembly 210 and the second lower mold assembly 230 are separated, the second ejector pin 252 will lift the power recovery device 600 to demold, making it easier for the operator to remove the power recovery device 600 and improving production efficiency.

[0059] Example 7: As an optimization of Example 6, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 18 , Figure 19 , Figure 20 , Figure 21As shown, the second lower mold assembly 230 includes a second lower mold pad 232 connected to the second support assembly 240, a second lower template 233 connected to the top of the second lower mold pad 232, and a plurality of second lower mold air ducts 234 installed on the second lower template 233. The second lower template 233 has a second lower mold cutting edge 2331 corresponding to the second punch assembly 220. The air outlets of the second lower mold air ducts 234 face the second lower mold cutting edge 2331. The second central positioning shaft 251 and the second positioning pin 253 are both fixed to the second lower template. On plate 233, the second lower template 233 is provided with a second lower die receiving groove 2332 coaxially arranged with the second central positioning shaft 251. The second lower die receiving groove 2332 is used to accommodate the second dome 630 at the bottom of the third stamping part 500 or the power recovery device 600. The second lower die pad 232 has a second through groove 2321 corresponding to the second lower die cutting edge 2331. The second through groove 2321 has the same shape as the second lower die cutting edge 2331, and the size of the second through groove 2321 is larger than the size of the second lower die cutting edge 2331. This design facilitates the removal of waste and iron filings generated during precision cutting through the second through groove 2321, ensuring the cleanliness of the top surface of the second lower template 233 and preventing iron filings residue from affecting the quality and accuracy of the precision cutting.

[0060] In this embodiment, multiple second lower mold air ducts 234 are arranged in a fan shape to blow off iron filings at different positions on the second lower mold plate 233. A second position sensor 235 is also installed on the second lower mold plate 233. The opening and closing of the second lower mold air ducts 234 are controlled by a second solenoid valve. The second position sensor 235 is electrically connected to the second solenoid valve. The second position sensor 235 can be an inductive sensor or a capacitive sensor. When the second upper mold assembly 210 and the second lower mold assembly 230 are closed for precision trimming, the bottom surface of the third body 613 of the third stamping part 500 is in contact with the top surface of the second lower mold plate 233.

[0061] When the second position sensor 235 detects that the second upper mold assembly 210 and the second lower mold assembly 230 are separating, the second position sensor 235 transmits an electrical signal to the second solenoid valve, the second solenoid valve opens, and the second lower mold air duct 234 starts blowing air, blowing the iron filings on the top surface of the second lower mold plate 233 into the second lower mold cutting edge 2331 and causing them to fall. When the second position sensor 235 detects that the second upper mold assembly 210 and the second lower mold assembly 230 are closing, the second position sensor 235 transmits the opposite electrical signal to the second solenoid valve, the second solenoid valve closes, and the second lower mold air duct 234 stops blowing air.

[0062] By setting up an automatic second lower die air duct 234, the operator's operation process can be reduced, cleaning time can be saved, and production efficiency can be improved. The second through groove 2321 is designed to have the same shape as the second lower die cutting edge 2331. The size of the second through groove 2321 is larger than the size of the second lower die cutting edge 2331, which is conducive to the waste and iron filings generated by the precision cutting edge falling through the second through groove 2321, ensuring the cleanliness of the top surface of the second lower die template 233, and preventing iron filings residue from affecting the quality and accuracy of the precision cutting edge.

[0063] Example 8: As an optimization of Example 7, such as Figure 6 , Figure 22 As shown, the second punch assembly 220 includes four second punches A221 arranged in a circumferential array around the axis of the second central positioning axis 251. All four second punches A221 are connected to the second upper die assembly 210. The shape of the second punches A221 is the same as that of the corresponding second lower die cutter 2331. The size of the second punches A221 and the corresponding second lower die cutter 2331 is the same. The bottom end of the second punches A221 has a second guide knife A2211.

[0064] Before the second punch A221 performs precision trimming on the third stamping part 500, the second guide knife A2211 first enters the second lower die cutting edge 2331. During the process of the second punch A221 moving down to perform precision trimming on the third stamping part 500, the outer side of the second guide knife A2211 slides and fits against the inner wall of the second lower die cutting edge 2331, which guides the second punch A221. The second guide knife A2211 has a similar structural design to the first guide knife A1211, thus accurately guiding the second punch A221 from at least three directions, ensuring that the second punch A221 can be smoothly pressed into the second lower die cutting edge 2331, which will not be elaborated here.

[0065] By setting the second guide knife A2211, the second punch A221 can be prevented from bending and deforming during the initial process of precision cutting, which would prevent the second punch A221 from being pressed smoothly into the second lower die cutter 2331 to perform precision cutting on the third stamping part 500.

[0066] Example 9: As an optimization of Example 8, such as Figure 5 , Figure 6 , Figure 18 , Figure 20 , Figure 23 , Figure 24 , Figure 25 , Figure 26As shown, the second upper die assembly 210 includes a second upper die base 211, symmetrically distributed second nitrogen springs 212 mounted on the second upper die base 211, a second punch pad 213 connected to the second upper die base 211, a second punch fixing plate 214 connected to the second punch pad 213, symmetrically distributed second upper die guide pillars 215 connected to the second punch fixing plate 214, a second pressure plate 217 connected to the second upper die base 211 via a second unloading screw 216, symmetrically distributed second shock-absorbing pillars 218 mounted on the second pressure plate 217, and a plurality of second upper die air ducts 219 mounted on the second pressure plate 217. The second punch A221 is mounted on the second punch pad 213. The second punch fixing plate 214 has a second limiting groove 2141 for limiting the second punch A221. The second upper die holder 211 has a second limiting countersunk hole 2111 corresponding to the second unloading screw 216. The bottom end of the second unloading screw 216 is fixed in the second pressure plate 217. The second pressure plate 217 is located below the second punch fixing plate 214. The second pressure plate 217 is slidably engaged with the second upper die guide post 215. The second nitrogen spring 212 separates the second pressure plate 217 from the second punch fixing plate 214. The second pressure plate 217 has a second guide groove 2171 corresponding to the second punch A221. The air outlet of the second upper die air duct 219 faces the second guide groove 2171. The second pressure plate 217 is provided with a second upper die receiving groove 2172 corresponding to the second lower die receiving groove 2332. The second upper die receiving groove 2172 is used to receive the first dome 620 at the top of the third stamping part 500 or the power recovery device 600.

[0067] It should be noted that the second upper mold base 211 limits the range of motion of the second unloading screw 216 by the second limiting countersunk hole 2111, thereby limiting the distance between the second pressure plate 217 and the second upper mold base 211 and preventing the second pressure plate 217 from falling off.

[0068] In this embodiment, the second lower mold plate 233 is provided with a second lower mold guide sleeve 2333 corresponding to the second upper mold guide post 215. The second lower mold guide sleeve 2333 guides the second upper mold guide post 215, ensuring the matching accuracy of the second upper mold assembly 210 and the second lower mold assembly 230, thereby improving the accuracy of the rough cutting edge. The bottom of the second pressure plate 217 is provided with a blind hole 2173 corresponding to the second positioning pin 253 to prevent the second positioning pin 253 from affecting the downward pressing of the second pressure plate 217. Multiple second upper mold air ducts 219 are arranged in a fan shape to blow off iron filings at different positions on the second pressure plate 217. The second upper mold air ducts 219 and the second lower mold air ducts 234 are staggered. The opening and closing of 19 is also controlled by the second solenoid valve. The second position sensor 235 can transmit an electrical signal to the second solenoid valve to control the opening and closing of the second upper mold air duct 219 and the second lower mold air duct 234. Since the distance between the four second punches A221 is small, the second nitrogen spring 212 cannot be directly placed between two adjacent second punches A221. In order to make the power recovery device 600 be uniformly pressed during the forming process, the second nitrogen spring 212 between two adjacent second punches A221 is set in the second upper mold base 211 and pushes the second pressure plate 217 through the push rod 2121. The push rod 2121 slides with the second punch pad 213 and the second punch fixing plate 214.

[0069] When the third stamping part 500 is precision trimmed, the second upper die assembly 210 moves downward, the second upper die guide post 215 enters the second lower die guide sleeve 2333, and the second pressure plate 217 first contacts the top surface of the third body 613 of the third stamping part 500. The second upper die base 211 and the second pressure plate 217 jointly compress the second nitrogen spring 212 or push rod 2121. The second nitrogen spring 212 is compressed and provides thrust to the second pressure plate 217, which pushes the second pressure plate 217 downward. The third stamping part 500 is moved down until the bottom surface of the third body 613 of the third stamping part 500 is in contact with the top surface of the second lower template 233. After that, the position of the second pressure plate 217 remains unchanged, the other parts of the second upper mold assembly 210 continue to move down, the second nitrogen spring 212 continues to compress, and the second punch A221 extends out of the second guide groove 2171 of the second pressure plate 217 and cooperates with the second lower mold cutting edge 2331 of the second lower template 233 to perform precision cutting on the third stamping part 500.

[0070] When the second upper mold assembly 210 and the second lower mold assembly 230 separate, the second nitrogen spring 212 extends, the position of the second pressure plate 217 remains unchanged, the other parts of the second upper mold assembly 210 move upward, and the second punch A221 retracts into the second guide groove 2171 of the second pressure plate 217. When the other parts of the second upper mold assembly 210 move upward to a certain height, the second upper mold base 211 pulls the second pressure plate 217 upward synchronously through the second unloading screw 216.

[0071] The opening and closing control principle of the second upper mold air duct 219 is the same as that of the second lower mold air duct 234 in Example 7, and will not be repeated here.

[0072] The second damping column 218 can absorb and reduce the impact and vibration generated during the stamping process when the second upper die assembly 210 and the second lower die assembly 230 are closed, ensuring the stability and safety of the stamping process and extending the service life of the mold. The second nitrogen spring 212 can play a buffering role during the stamping and trimming process, so that the power recovery device 600 is subjected to uniform pressure during the forming process, which helps to reduce defects such as deformation, warping and wrinkles of the power recovery device 600, and improve the dimensional accuracy and surface quality of the power recovery device 600. When the second upper die assembly 210 and the second lower die assembly 230 are separated, the second nitrogen spring 212 will push the second pressure plate. 217 moves, causing the second punch A221 to retract into the second guide groove 2171 of the second pressure plate 217, facilitating the demolding of the power recovery device 600. Without such a structural design, the power recovery device 600 would easily get stuck on the second punch assembly 220. During the stamping process, the second upper die guide post 215 guides the second pressure plate 217, and the second guide groove 2171 guides the second punch A221, ensuring the positional accuracy of the precision cut edge. The second upper die air duct 219 can blow off the iron filings attached to the bottom surface of the second pressure plate 217, ensuring the cleanliness of the bottom surface of the second pressure plate 217 and preventing iron filings residue from affecting the quality and accuracy of the precision cut edge.

[0073] Example 10: As an optimization of Example 9, such as Figure 5 , Figure 6 , Figure 26 , Figure 27As shown, the second support assembly 240 includes a second lower base plate 241, multiple second lower pads 242 connected to the second lower base plate 241, a second lower mold base 243 connected to the second lower pads 242, and a second limiting post A244 connected to the second lower mold base 243. A second lower mold pad 232 is installed on the second lower mold base 243. A second discharge groove 2431 corresponding to the second through groove 2321 is passed through the second lower mold base 243. The shape of the second discharge groove 2431 is the same as that of the second through groove 2321, and the size of the second discharge groove 2431 is larger than that of the second through groove 2321. A second limiting post B2112 corresponding to the second limiting post A244 is installed on the second upper mold base 211. The second limiting post A244 and the second limiting post B2112 are used to limit the distance between the second upper mold assembly 210 and the second lower mold assembly 230 when they are closed.

[0074] It should be noted that the bottom ends of the multiple second lower pads 242 are fixedly connected to the second base plate, and the top ends of the multiple second lower pads 242 are fixedly connected to the second lower mold base 243.

[0075] In this embodiment, in order to provide stable support for the whole, and based on the positional distribution of the second discharge groove 2431, the second lower pad 242 below the second discharge groove 2431 is widened, and the widened second lower pad 242 is provided with a second guide groove 2421 corresponding to the second discharge groove 2431, so that waste or iron filings can fall onto the second base plate; a second lower mold guide post 245 is installed on the second lower mold base 243, and a second upper mold guide sleeve 2113 corresponding to the second lower mold guide post 245 is provided on the second upper mold base 211. The second lower mold guide post 245 guides the second upper mold guide sleeve 2113. Through the cooperation of the first lower mold guide post 145 and the first upper mold guide sleeve 1113, and the cooperation of the first upper mold guide post 115 and the first lower mold guide sleeve 1333, the matching accuracy of the first upper mold assembly 110 and the first lower mold assembly 130 is ensured.

[0076] By setting the second limiting post A244 and the second limiting post B2112, the third stamping part 500 and the power recovery device 600 can be protected from being crushed. The waste and iron filings generated by the precision cutting edge fall into the second lower base plate 241 through the second lower die cutting edge 2331, the second through groove 2321 and the second discharge groove 2431 in sequence, so as to be collected and processed in a centralized manner.

[0077] like Figures 28-34 As shown, the molding process of the energy recovery device includes the following steps: Step 1: First, place the first stamped part 300 on the first support and positioning assembly 150 (as shown in the attached document). Figure 29As shown in the figure, the dotted line represents the part blocked by the first stamping part 300. The blocked part includes the entire first ejector pin 152, part of the first positioning pin 153 and part of the first lower die cutting edge 1331; the first positioning pin 153 provides support for the first stamping part 300, and the first ejector pin 152 does not contact the first stamping part 300. Step 2: Control the first upper die assembly 110 and the first punch assembly 120 to press down, rough trimming the first stamped part 300 to form the first trimming groove 410, thus obtaining the second stamped part 400 (as shown in the attached figure). Figure 30 As shown in the figure, the dotted line represents the part blocked by the second stamping part 400. The blocked part includes the entire first ejector pin 152, part of the first positioning pin 153 and part of the first lower die cutting edge 1331; the first cutting groove 410 includes the first notch 411, the second notch 412, the third notch 413 and the fourth notch 414. Step 3: Manually rotate the second stamping part 400 so that the two first locating pins 153 respectively engage with the second notch 412 and the fourth notch 414 of the first cutting groove 410 (as shown in the attached diagram). Figure 31 As shown in the figure, the dotted line represents the part obscured by the second stamping part 400. The obscured part includes the entire first ejector pin 152 and part of the first lower die cutting edge 1331. It is worth noting that the first positioning pin 153 is not obscured by the second stamping part 400 at all. After the second stamping part 400 rotates, it falls to a certain height due to its own weight and the positional arrangement of the first positioning pin 153 and the first ejector pin 152. The first positioning pin 153 limits the second stamping part 400, and the first ejector pin 152 provides support for the second stamping part 400. Before manually rotating the second stamping part 400, it is necessary to control the first upper die assembly 110 and the first lower die assembly 130 to separate the molds. Step 4: Control the first upper die assembly 110 and the first punch assembly 120 to press down again, rough trimming the second stamping part 400 to form the second trimming groove 510, thus obtaining the third stamping part 500 (as shown in the attached figure). Figure 32 As shown in the figure, the dotted line represents the part blocked by the third stamping part 500. The blocked part includes the entire first ejector pin 152 and part of the first lower die cutting edge 1331; the second cutting groove 510 includes the fifth notch 511, the sixth notch 512, the seventh notch 513, and the eighth notch 514. Step 5: Remove the third stamped part 500 from the first support positioning assembly 150 and place it on the second support positioning assembly 250, so that the two second positioning pins 253 respectively engage with the second notch 412 and the fourth notch 414 of the first cutting groove 410, or the two second positioning pins 253 respectively engage with the sixth notch 512 and the eighth notch 514 of the second cutting groove 510 (as shown in the attached document). Figure 33As shown in the figure, the dotted line represents the part blocked by the third stamping part 500. The blocked part includes the entire second ejector pin 252 and part of the second lower die cutting edge 2331. Since the notches on the third stamping part 500 are symmetrically distributed around the center, the effect achieved by engaging the two second positioning pins 253 with the second notch 412 and the fourth notch 414 of the first cutting groove 410, or engaging the two second positioning pins 253 with the sixth notch 512 and the eighth notch 514 of the second cutting groove 510, is the same. Before removing the third stamping part 500 from the first support positioning assembly 150, it is necessary to control the first upper die assembly 110 and the first lower die assembly 130 to separate the molds. Step 6: Control the second upper die assembly 210 and the second punch assembly 220 to press down, and perform precision trimming on the third stamping part 500 to obtain the power recovery device 600 (as shown in the attached document). Figure 34 As shown in the figure, the dotted line represents the part blocked by the power recovery device 600. The blocked part includes the entire second ejector pin 252. By controlling the second upper mold assembly 210 and the second lower mold assembly 230 to separate the molds, the power recovery device 600 can be removed.

[0078] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present embodiments without departing from the spirit of the present embodiments and the scope of protection of the claims, and all of these forms are within the protection scope of the present embodiments.

Claims

1. A molding die for a power recovery device, characterized in that, include: The roughing mechanism (100) includes a first upper die assembly (110), a first punch assembly (120) connected to the first upper die assembly (110), a first lower die assembly (130) corresponding to the first upper die assembly (110), a first support assembly (140) connected to the first lower die assembly (130), and a first support positioning assembly (150) connected to the first lower die assembly (130). The first support positioning assembly (150) includes a first central positioning shaft (151), a first ejector pin (152) arranged in a circumferential array around the first central positioning shaft (151), and a first positioning pin (153) symmetrically distributed around the first central positioning shaft (151). The bottom ends of the first ejector pin (152) and the first positioning pin (153) are connected to a first return spring (154) disposed in the first lower die assembly (130) and the first support assembly (140). In its natural state, the top surface of the first positioning pin (153) is higher than the top surface of the first unloading ejector pin (152). The first central positioning shaft (151) is used to position the first stamping part (300) or the second stamping part (400) axially. When the first rough trimming is performed, the first positioning pin (153) provides support for the first stamping part (300). When the second rough trimming is performed, the first positioning pin (153) engages with at least a portion of the first trimming groove (410) of the second stamping part (400) to position the second stamping part (400) in a horizontal position. The first unloading ejector pin (152) provides support for the second stamping part (400). The first stamping part (300) is placed on the first support positioning assembly (150), and the first upper die assembly (110) and the first punch assembly (120) are controlled to press down to rough cut the first stamping part (300) to form the first cutting groove (410) and obtain the second stamping part (400). The first upper die assembly (110) and the first punch assembly (120) are pressed down again to rough cut the second stamping part (400) to form a second cutting groove (510) and obtain the third stamping part (500). The fine blanking mechanism (200) is located on one side of the rough blanking mechanism (100) and is used to finely cut the edges of the third stamping part (500).

2. The molding die for the power recovery device according to claim 1, characterized in that, The first lower die assembly (130) includes a first lower die pad (132) connected to the first support assembly (140), a first lower die template (133) connected to the top of the first lower die pad (132), and a plurality of first lower die air ducts (134) installed on the first lower die template (133). The first lower die template (133) has a first lower die cutting edge (1331) corresponding to the first punch assembly (120) through it. The air outlets of the first lower die air ducts (134) face the first lower die cutting edge (1331). The first central positioning shaft (151) is fixed on the first lower die template (133). 33) A first lower die receiving groove (1332) is provided, which is coaxially arranged with the first central positioning shaft (151). The first lower die receiving groove (1332) is used to receive the second dome (630) at the bottom of the first stamping part (300), the second stamping part (400), or the third stamping part (500). The first lower die pad (132) has a first through groove (1321) corresponding to the first lower die cutting edge (1331). The first through groove (1321) has the same shape as the first lower die cutting edge (1331), and the size of the first through groove (1321) is larger than the size of the first lower die cutting edge (1331).

3. The molding die for the power recovery device according to claim 2, characterized in that, The first punch assembly (120) includes a first punch A (121) and a first punch B (122) both connected to the first upper die assembly (110). There are two first punches A (121) and two first punches B (122). The two first punches A (121) are symmetrically distributed about the axis of the first central positioning axis (151), and the two first punches B (122) are symmetrically distributed about the axis of the first central positioning axis (151). The shapes of the first punches A (121) and the first punches B (122) are the same as those of the corresponding first lower die cutting edge (1331). The dimensions of the first punches A (121) and the first punches B (122) are both smaller than the dimensions of the corresponding first lower die cutting edge (1331). The bottom end of the first punch A (121) has a first guide knife A (1211), and the bottom end of the first punch B (122) has a first guide knife B (1221).

4. The molding die for the power recovery device according to claim 3, characterized in that, The first upper die assembly (110) includes a first upper die base (111), first nitrogen springs (112) symmetrically distributed on the first upper die base (111), a first punch pad (113) connected to the first upper die base (111), a first punch fixing plate (114) connected to the first punch pad (113), first upper die guide pillars (115) symmetrically distributed on the first punch fixing plate (114), a first pressure plate (117) connected to the first upper die base (111) via a first unloading screw (116), first shock-absorbing pillars (118) symmetrically distributed on the first pressure plate (117), and a plurality of first upper die air ducts (119) installed on the first pressure plate (117). The first punch A (121) and the first punch B (122) are both mounted on the first punch pad (113). The first punch fixing plate (114) has a first limiting groove (1141) for limiting the first punch A (121) and the first punch B (122). The first upper die holder (111) has a first limiting countersunk hole (1111) corresponding to the first unloading screw (116). The bottom end of the first unloading screw (116) is fixed in the first pressure plate (117). The first pressure plate (117) is located below the first punch fixing plate (114). The first pressure plate (117) is slidably engaged with the first upper die guide post (115). The first nitrogen spring (112) separates the first pressure plate (117) from the first punch fixing plate (114). The first pressure plate (117) has a first guide groove (1171) corresponding to the first punch A (121) and the first punch B (122). The air outlet of the first upper die air duct (119) faces the first guide groove (1171). The first pressure plate (117) is provided with a first upper die receiving groove (1172) corresponding to the first lower die receiving groove (1332). The first upper die receiving groove (1172) is used to receive the first dome (620) at the top of the first stamping part (300), the second stamping part (400), or the third stamping part (500).

5. The molding die for the power recovery device according to claim 4, characterized in that, The first support assembly (140) includes a first lower base plate (141), a plurality of first lower pads (142) connected to the first lower base plate (141), a first lower mold base (143) connected to the first lower pads (142), and a first limiting post A (144) connected to the first lower mold base (143). The first lower mold pad plate (132) is mounted on the first lower mold base (143), and the first lower mold base (143) has a first discharge groove (1421) corresponding to the first through groove (1321) extending through it. 31) The shape of the first discharge groove (1431) is the same as that of the first through groove (1321). The size of the first discharge groove (1431) is larger than that of the first through groove (1321). The first upper mold base (111) is equipped with a first limiting post B (1112) corresponding to the first limiting post A (144). The first limiting post A (144) and the first limiting post B (1112) are used to limit the distance between the first upper mold assembly (110) and the first lower mold assembly (130) when they are closed.

6. The molding die for the power recovery device according to claim 1, characterized in that, The fine blanking mechanism (200) includes a second upper die assembly (210), a second punch assembly (220) connected to the second upper die assembly (210), a second lower die assembly (230) corresponding to the second upper die assembly (210), a second support assembly (240) connected to the second lower die assembly (230), and a second support positioning assembly (250) connected to the second lower die assembly (230). The second support positioning assembly (250) includes a second central positioning shaft (251), a second ejector pin (252) arranged in a circumferential array around the second central positioning shaft (251), and a second positioning pin (253) symmetrically distributed around the second central positioning shaft (251). The bottom end of the second ejector pin (252) is connected to a second return spring (254) disposed in the second lower die assembly (230) and the second support assembly (240). The second positioning pin (253) is fixed on the second lower die assembly (230). In its natural state, the top surface of the second positioning pin (253) is higher than the top surface of the second ejector pin (252). The second center positioning shaft (251) is used to position the third stamping part (500) at the axial center. When the edge is finely cut, the second positioning pin (253) engages with the first cutting groove (410) or the second cutting groove (510) at the non-finely cut edge of the third stamping part (500) to position the third stamping part (500) at the horizontal position. The second ejector pin (252) provides support for the third stamping part (500).

7. The molding die for the power recovery device according to claim 6, characterized in that, The second lower die assembly (230) includes a second lower die pad (232) connected to the second support assembly (240), a second lower die template (233) connected to the top of the second lower die pad (232), and a plurality of second lower die air ducts (234) installed on the second lower die template (233). The second lower die template (233) has a second lower die cutting edge (2331) corresponding to the second punch assembly (220) through it. The air outlets of the second lower die air ducts (234) face the second lower die cutting edge (2331). The second central positioning shaft (251) and the second positioning pin (253) are both fixed to the second lower die template (233). 3) The second lower template (233) is provided with a second lower die receiving groove (2332) coaxially arranged with the second central positioning shaft (251). The second lower die receiving groove (2332) is used to receive the second dome (630) at the bottom of the third stamping part (500) or the power recovery device (600). The second lower die pad (232) has a second through groove (2321) corresponding to the second lower die cutting edge (2331). The second through groove (2321) has the same shape as the second lower die cutting edge (2331), and the size of the second through groove (2321) is larger than the size of the second lower die cutting edge (2331).

8. The molding die for the power recovery device according to claim 7, characterized in that, The second punch assembly (220) includes four second punches A (221) arranged in a circumferential array around the second central positioning axis (251). All four second punches A (221) are connected to the second upper die assembly (210). The shape of the second punches A (221) is the same as that of the corresponding second lower die cutter (2331). The size of the second punches A (221) is the same as that of the corresponding second lower die cutter (2331). The bottom end of the second punches A (221) has a second guide knife A (2211).

9. The molding die for the power recovery device according to claim 8, characterized in that, The second upper die assembly (210) includes a second upper die base (211), symmetrically distributed second nitrogen springs (212) mounted on the second upper die base (211), a second punch pad (213) connected to the second upper die base (211), a second punch fixing plate (214) connected to the second punch pad (213), symmetrically distributed second upper die guide pillars (215) connected to the second punch fixing plate (214), a second pressure plate (217) connected to the second upper die base (211) via a second unloading screw (216), symmetrically distributed second shock-absorbing pillars (218) mounted on the second pressure plate (217), and a plurality of second upper die air ducts (219) mounted on the second pressure plate (217). The second punch A (221) is mounted on the second punch pad (213). The second punch fixing plate (214) has a second limiting groove (2141) for limiting the second punch A (221). The second upper die holder (211) has a second limiting countersunk hole (2111) corresponding to the second unloading screw (216). The bottom end of the second unloading screw (216) is fixed in the second pressure plate (217). The second pressure plate (217) is located below the second punch fixing plate (214). The second pressure plate (217) is slidably engaged with the second upper die guide post (215). The second nitrogen spring (212) separates the second pressure plate (217) from the second punch fixing plate (214). The second pressure plate (217) has a second guide groove (2171) corresponding to the second punch A (221). The air outlet of the second upper die air duct (219) faces the second guide groove (2171). The second pressure plate (217) is provided with a second upper die receiving groove (2172) corresponding to the second lower die receiving groove (2332). The second upper die receiving groove (2172) is used to receive the first dome (620) at the top of the third stamping part (500) or the power recovery device (600).

10. The molding die for the power recovery device according to claim 9, characterized in that, The second support assembly (240) includes a second lower base plate (241), multiple second lower pads (242) connected to the second lower base plate (241), a second lower mold base (243) connected to the second lower pads (242), and a second limiting post A (244) connected to the second lower mold base (243). The second lower mold pad plate (232) is installed on the second lower mold base (243), and the second lower mold base (243) has a second discharge groove (244) corresponding to the second through groove (2321) extending through it. 31) The shape of the second discharge groove (2431) is the same as that of the second through groove (2321). The size of the second discharge groove (2431) is larger than that of the second through groove (2321). The second upper mold base (211) is equipped with a second limiting post B (2112) corresponding to the second limiting post A (244). The second limiting post A (244) and the second limiting post B (2112) are used to limit the distance between the second upper mold assembly (210) and the second lower mold assembly (230) when they are closed.

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