Thermoforming, hole-punching and edge-cutting integrated technique and mold of high-duty steel part

[0026] The integrated process of hot forming, punching and trimming of high-strength steel parts of the present invention firstly includes corresponding trimming and punching on the punch, die or press plate of the hot forming die of high-strength steel parts. Hole tool, install edge trimming and punching device on punch, die or pressing plate. The process of this process is that the sheet material heated to austenite state is placed on the concave mold of the thermoforming mold → driven by the press, the pressing plate first presses the thermoformed sheet, and then the convex mold and the concave mold are closed , Complete the hot forming of the part → the movement of the trimming and punching device in the punch, die or blanking plate to complete the trimming and punching → pass the cooling medium into the punch, the die or the blanking plate to perform the mold Cooling to achieve quenching of high-strength parts. At the same time, the trimming and punching tools are reset, and the scrap formed by trimming and punching is ejected. Under the drive of the press, the punch and die are opened, and the hot formed parts and trimming are taken out. Scrap formed by punching. The processes of hot forming, trimming and punching of high-strength steel parts can be completed in one stamping process.

[0027] figure 2 , image 3 with Figure 4 Gives a way to Figure 1a with Figure 1b The structure of the integrated mold for thermoforming, punching and trimming of the parts shown, figure 2 with Figure 4 The mold state before punching and hot trimming of the part after hot forming is given, Figure 5 with Figure 6The state of the part after punching and hot trimming is given. The hot forming, trimming and punching integrated die includes a blanking plate 1, an upper trimming tool 2, a lower trimming tool 3, a lower trimming tool 12, an upper trimming tool 13, a lower punching tool 8, and an upper punching tool 15. Lower trimming cylinder 6, lower trimming cylinder 10, upper trimming cylinder 14, upper trimming cylinder 19, lower punching cylinder 7, upper punching cylinder 17, ejector pin 4, ejector pin 11, ejector pin 16, forming convex Die 18 and forming die 5. The forming male mold 18 and the forming female mold 5 adopt the technology disclosed in CN101288889, and cooling water channels are provided in the forming male mold 18 and the forming female mold 5 ( figure 2 Not shown in). The outer contour of the forming punch 18 is consistent with the inner shape of the part, and the inner cavity contour of the forming female mold 5 is consistent with the outer shape of the part. An upper trimming cylinder 19 and an upper trimming cylinder 14 are installed on the top surface of the blanking plate 1, an upper punching cylinder 17 is installed on the upper end of the forming punch 18, and a lower trimming cylinder 6 and a lower trimming are installed on the forming die 5. The cylinder 10 and the lower punch cylinder 7. The piston rod 19c of the upper trimming cylinder 19 is connected with the upper trimming tool 2 through threads, the piston rod 14c of the upper trimming cylinder 14 is connected with the upper trimming tool 13 through threads, and the piston rod 6c of the lower trimming cylinder 6 The mandrel 4 is connected with the mandrel 4 by threads, the mandrel 4 is connected with the lower trimming tool 3 by the threads, the piston rod 10c of the lower trimming cylinder 10 is connected with the mandrel 11 by threads, and the mandrel 11 is connected with the lower trimming by the threads. The tools 12 are connected together. The piston rod 17c of the upper punching cylinder 17 is connected with the mandrel 16 through threads, the mandrel 16 is connected with the upper punching tool 15 through threads, and the piston rod 7c of the lower punching cylinder 7 is connected with the lower punching tool through threads 8 connected together. The forming punch 18 and the blanking plate 1 are fixed on the upper template (not shown in the figure) by screws and pins, the upper template is then fixed on the slider of the press, and the forming female mold 5 is fixed on the lower template ( (Not shown in the figure) The upper and lower templates are then fixed on the worktable of the press.

[0028] In the hot forming process, the forming punch 18 and the blanking plate 1 move downwards driven by the press slider and the upper template. The blanking plate 1 first contacts the austenite heated to the upper surface of the lower die 5 For the high-strength steel plate, the elastic pressing device (not shown in the figure) on the top surface of the pressing plate 1 will compress, thereby pressing the high-strength plate to avoid wrinkling and other defects during the forming process. While the press slider continues to descend, the forming punch 18 presses the high-strength steel plate heated to the austenite state into the forming die 5, so that the high-strength plate is formed in the mold to form an uncut edge punching Hot formed parts 9.

[0029] After the parts are formed, the auxiliary hydraulic system controls the piston rod 19c of the upper trimming cylinder 19 to drive the upper trimming tool 2 downward, while the hydraulic system controls the piston rod 6c of the lower trimming cylinder 6 to drive the top rod 6, the lower trimming tool 3. Downward movement; the auxiliary hydraulic system controls the piston rod 14c of the upper trimming cylinder 14 to drive the upper trimming tool 13 downwards, while the hydraulic system controls the piston rod 10c of the lower trimming cylinder 10 to drive the top rod 11 and the lower trimming tool 12 Moving downwards; under the combined action of the upper surface of the forming die 5, the upper trimming tool 2, the lower trimming tool 3, the upper trimming tool 13, and the lower trimming tool 12, the waste 20 formed by the hot trimming is thermoformed from the edge to be trimmed The parts 9 are separated to complete the hot trimming process inside the mold. The auxiliary hydraulic system controls the piston rod 7c of the lower punching cylinder 7 to drive the lower punching tool 8 upwards, while the hydraulic system controls the piston rod 17c of the upper punching cylinder 17 to drive the top rod 16 and the upper punching tool 15 to move upwards. Under the combined action of the lower surface of the forming punch 18, the upper punching tool 15, and the lower punching tool 8, the waste 21 formed by hot punching is separated from the hot forming part 9 to be punched, thereby completing the hot punching inside the mold process. In the process of hot punching and hot trimming of high-strength steel parts, the hot punching process and hot trimming process are performed simultaneously inside the mold.

[0030] After the hot edge trimming and hot punching are completed, a cooling medium is introduced into the cooling water channels of the forming male mold 18 and the forming female mold 5 to cool the mold, thereby quenching the formed part. While passing cooling water into the mold, the auxiliary hydraulic system controls the lower trimming cylinder 6, the lower trimming cylinder 10, the upper trimming cylinder 14, and the upper trimming cylinder 19 to drive the corresponding trimming tool along the opposite side of the trimming. The lower punching cylinder 7 and the upper punching cylinder 17 drive the punching tool to run in the direction opposite to the punching direction, and the trimming waste 20 formed by trimming is ejected from the forming die 5 and punched The formed punching waste 21 is ejected from the forming punch 18. After the formed parts are cooled, the press slider moves upwards. Driven by the upper template, the forming punch 18 and the pressing plate 1 move upwards, the mold opens, and the trimming waste 20, punching waste 21 and forming parts 22 are taken out Mold, and then enter the next work cycle.

[0031] The trimming process needs to cut all the scrap around the hot forming part 9 of high-strength steel to be trimmed. In order to ensure the smooth implementation of the trimming process and simplify the design of the trimming tool, the trimming tool is as shown in Figure 10. Block form. The peripheral contour of the high-strength steel part may be an arbitrary curve. The number of blocks for the lower edge trimming tool is determined by the complex program of the high-strength steel part. The number of blocks for the upper edge trimming tool and the lower edge trimming tool is the same. Among all the blocks of the trimming tool, a few of them exceed the boundary line of the high-strength steel part ( image 3 The dotted line in the middle) to ensure that the waste can be divided into several pieces after trimming, which is convenient for taking out the waste. The thickness of the edge trimming tool is generally determined according to the wall thickness of the formed high-strength parts. The thickness of the edge trimming tool is 1.5 to 4.0 times the wall thickness of the part. Strength parts, remove the lower limit. During the trimming process, the upper trimming tool is guided through the corresponding mounting hole in the blanking plate 1, and the lower trimming tool is guided through the corresponding mounting hole in the forming die 5.

[0032] The single-piece trimming tool is generally longer in length. If a hydraulic cylinder is used to apply trimming force to the trimming tool, it will result in insufficient trimming force or the uneven force of the trimming tool in the trimming process will lead to deflection, which will speed up the cutting. Wear speed of edge tools and molds. In order to solve this problem, such as Figure 4 with Figure 6 As shown, according to the size of the upper trimming tool 2, the upper trimming tool 13 or the lower trimming tool 3, 12, two or more upper mold cylinders or lower mold cylinders are used to provide the trimming tool with trimming force, and the cylinders should be The edge-cutting tools are uniformly distributed to ensure that the edge-cutting tools can provide sufficient cutting force, and the force of the edge-cutting tools is balanced to avoid deflection. The upper oil holes 19a of the upper mold cylinders 19 that provide power for the upper trimming tool 2 are connected together, and the lower oil holes 19b are connected together to ensure that the multiple cylinders of the upper mold can act simultaneously; provide the upper trimming tool 13 The upper oil holes 14a of the power multiple upper mold cylinders 14 are connected together, and the lower oil holes 14b are connected together to ensure that the multiple cylinders of the upper mold can operate at the same time; the multiple lower mold cylinders 6 that provide power for the lower trimming tool 3 The upper oil holes 6a are connected together, and the lower oil holes 6b are connected together to ensure that multiple lower mold cylinders can operate at the same time; the upper oil holes 10a of the multiple lower mold cylinders 10 that provide power for the lower trimming tool 12 are connected together, The lower oil holes 10b are connected together to ensure that multiple lower mold oil cylinders can act simultaneously.