A stamping type manufacturing metal mold

Abstract

The application relates to the technical field of metal molds, in particular to a stamping type manufacturing metal mold which comprises a mold base, a female die, guide columns, an upper mold base and a male die, wherein the female die is fixedly installed on the top wall of the lower mold base, a plurality of guide columns are connected to the four corners of the top wall of the lower mold base, the top portions of the guide columns are jointly connected with the upper mold base, the male die is installed on the bottom of the upper mold base, the male die is movably matched with the female die through the up-down movement of the upper mold base, and the male die is internally provided with a lubricating device for accurately supplying lubricating oil to the mold processing position. The lubricating device accurately supplies lubricating oil to the mold processing position, not only saving the use amount of the lubricating oil, but also improving the cooling and lubricating effect in cold forging stamping, avoiding the influence of the splashing of the lubricating oil on the normal work of other equipment, and reducing the production cost without the need of additionally installing other equipment.

Description

Technical Field

[0001] This invention relates to the field of metal mold technology, specifically to a stamping type metal mold. Background Technology

[0002] Stamping is a forming process that uses a press and dies to apply external force to sheet metal, strip, tube, and profiles, causing plastic deformation or separation to obtain workpieces (stamped parts) of the desired shape and size. The dies used in stamping are called stamping dies, or simply dies. Dies are specialized tools used to process materials (metal or non-metal) into the required stamped parts in batches. Dies are crucial in stamping; without suitable dies, mass production is difficult; without advanced dies, advanced stamping processes cannot be realized. The stamping process, dies, stamping equipment, and stamping materials constitute the four essential elements of stamping processing; only when these elements are combined can stamped parts be produced.

[0003] During the stamping process, especially in cold forging, the temperature of a workpiece rises rapidly, necessitating lubrication. If stamping is performed without lubrication, the workpiece surface finish will be affected, the die life will be shortened, and precision will decrease, requiring significant investment in die improvements. For these reasons, stamping lubrication is essential in cold forging.

[0004] Currently, the main lubrication methods are immersion, dripping, spraying, or brushing onto the workpiece. However, these methods all have a common drawback: they cannot accurately apply the lubricating oil to the designated processing position during the stamping process. Achieving lubrication by completely covering the upper surface of the workpiece with lubricating oil not only results in a lot of waste but also easily causes lubricating oil to splash everywhere, affecting the normal operation of other equipment.

[0005] To address this, a stamping-type metal manufacturing die is proposed. Through a lubrication device, lubricating oil is precisely delivered to the die processing position, which not only saves the amount of lubricating oil used, but also improves the cooling and lubrication effect in cold forging and stamping. Summary of the Invention

[0006] The purpose of this invention is to provide a stamping type metal manufacturing mold that, through a lubrication device, precisely delivers lubricating oil to the mold processing position, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A stamping die for manufacturing metal includes a lower die base, a die cavity, guide pillars, an upper die base, and a punch. The die cavity is fixedly installed on the top wall of the lower die base via a threaded connection. Multiple guide pillars are fixedly installed at the four corners of the top wall of the lower die base. The tops of the multiple guide pillars are connected to the upper die base. The punch is installed on the bottom wall of the upper die base, and the punch cooperates with the die cavity by moving up and down through the upper die base.

[0009] A lubrication device is installed inside the punch to precisely deliver lubricating oil to the die processing position.

[0010] Preferably, the lubrication device includes an oil inlet, an oil outlet, a control rod, and oil passage holes. The top of the punch has an oil inlet in a vertical direction, and multiple oil outlets are opened laterally on the side wall. The middle ends of the oil inlet and the oil outlets are connected. A sliding groove is opened inside the punch, and a small hole is opened on the bottom wall of the punch. A control rod that cooperates with the sliding groove is slidably installed in the sliding groove, and the bottom end of the control rod extends out of the small hole. Oil passage holes that cooperate with the oil outlets are opened around the top of the control rod. The oil passage holes will allow the oil outlets to flow or be cut off as the control rod moves up and down, thereby controlling the flow and disconnection between the oil inlet and the oil outlets. Before processing, lubricating oil is first connected to the input end of oil inlet one. When the stamping equipment is started, the upper die holder will drive the punch to move up and down reciprocally in the vertical direction to achieve the processing purpose. The punch begins to move downward, and the bottom of the control rod first contacts the workpiece. At this time, it continues to move downward until the bottom of the punch is fully in contact with the workpiece. At the same time, the control rod is fully pressed back into the punch. The oil passage hole opened above the control rod corresponds exactly to oil outlet one, allowing the oil outlet one to circulate. This allows the lubricating oil to slowly flow out from oil outlet one through oil inlet one, flowing to the bottom of the punch side wall for lubrication. At this time, the punch continues to move downward, and the punch punches the workpiece. After the blanking is completed, the middle part falls out of the blanking hole. At this time, the control rod falls again under the action of gravity, and the small hole re-extends from the bottom. The position of the oil passage is offset from the oil outlet, so the oil outlet is cut off. At this time, the lubricating oil stops flowing out. The upper die holder drives the punch back to the initial position. When the workpiece moves to the designated processing position, the processing is performed again. The above steps are automatically repeated without manual operation. This lubrication device changes the internal structure of the punch and does not require the addition of additional spraying devices or other mechanisms. It is automatically triggered when the control rod is squeezed back by the workpiece during each stamping and acts on the bottom of the punch on the side that acts on the workpiece, achieving the effect of saving space and precise lubrication.

[0011] Preferably, a return spring is installed between the control rod and the sliding groove. When the punch starts to move downward, the bottom of the control rod first contacts the workpiece. As it continues to move downward, the spring is compressed until the control rod is completely pressed back into the punch. At the same time, the spring is fully compressed, and the punch punches the workpiece. After punching, the elastic force of the return spring will eject the middle part of the workpiece from the blanking port. Since the lubricating oil flowing out at this time can no longer act on the processing position, the return spring can make the control rod return to the initial position more quickly, avoiding the punch sticking to the workpiece after punching, which would cause a long time of lubricating oil leakage and waste. In addition, the return spring can also effectively prevent the phenomenon of material jamming during punching.

[0012] Preferably, the top of the punch has multiple adjustment holes, and the top of the control rod extends out of the adjustment holes and is connected to a pull ring. When processing begins, since it takes a certain amount of time for the lubricating oil to flow to the bottom, and the movement speed of the punch during stamping is much higher than the speed at which the lubricating oil flows to the bottom of the punch during processing, the workpiece and the outer surface of the mold are not lubricated during the first processing. If processing is carried out directly, the workpiece will have problems such as burrs, scratches, and deformation. Therefore, pre-lubrication must be performed before processing. At this time, the pull ring can be pulled upward manually to move the control rod upward so that the oil passage hole is exactly aligned with the oil outlet. At this time, the oil outlet flows inside, and the lubricating oil flows slowly out from the oil inlet to the bottom of the punch side wall to play a pre-lubricating role. At this time, the stamping equipment can be started to begin processing.

[0013] Preferably, the sidewall of the punch has a guide groove below the oil outlet that communicates with the oil outlet. When the lubrication device is working, the lubricating oil flows slowly from the oil outlet through the oil inlet. However, since the oil outlet is too narrow, the lubricating oil cannot be evenly distributed on the sidewall of the punch when it flows out. Therefore, a guide groove is opened below the oil outlet so that the lubricating oil flowing out from the oil outlet accumulates inside the guide groove. Since the lubricating oil used for punching in the stamping equipment has a low viscosity, when the lubricating oil accumulates to a certain extent, it will overflow evenly from the guide groove and be evenly distributed on the entire side when it reaches the bottom of the punch, thus improving the lubrication effect.

[0014] Preferably, a rubber pad is fixedly installed at the bottom of the control rod. During the processing, the control rod comes into contact with the workpiece. In order to prevent the control rod from scratching or denting the workpiece under the elastic force of the return spring and gravity, which would reduce the quality of the processed product, a rubber pad is fixedly installed at the bottom of the control rod. The flexible material at the bottom can effectively prevent the above phenomenon from occurring.

[0015] Preferably, the rubber pad is detachably installed at the bottom of the control rod. The rubber pad can also be of different heights. In actual production, different workpieces and different processing speeds will result in different amounts of lubricating oil required for each processing. At this time, the amount of lubricating oil flowing out each time can be adjusted by replacing the rubber pad with one of different heights. When the height of the rubber pad decreases, the stroke of the control rod will also decrease. At this time, the area between the oil passage and the oil outlet becomes smaller, so that the amount of lubricating oil flowing out each time also decreases, thereby achieving the effect of adjusting the amount of oil flowing out at one time.

[0016] Preferably, the lubrication device includes two oil inlets, two oil outlets, a cavity, a movable sleeve, a blocking ball, a ball cover, and two return springs. The cavity is formed inside the punch, and the top wall of the punch has two oil inlets connected to the top wall of the cavity. A ball cover is fixedly installed on the top of the cavity, and a blocking ball that cooperates with two oil inlets is movably installed inside the ball cover. Multiple oil outlets are formed on the bottom wall of the punch and connected to the side walls of the cavity. A movable sleeve is slidably installed inside the cavity, and multiple oil passage grooves that cooperate with two oil outlets are formed around the movable sleeve. A through hole is formed on the bottom wall of the punch, and a push rod extending out of the through hole is connected to the bottom of the movable sleeve. A return spring is installed between the bottom of the push rod and the through hole. Before processing, lubricating oil is first connected to oil inlet two to fill the cavity. When the stamping equipment is started, the punch begins to move downwards. The push rod at the bottom of the movable sleeve first contacts the workpiece, causing the movable sleeve to move upwards and squeeze the lubricating oil inside the cavity. At the same time, the return spring two is compressed, and the blocking ball moves upwards with the liquid flow and pressure to block oil inlet two. The oil passage on the movable sleeve also gradually moves to the position of oil outlet two. At this time, the normally closed oil outlet two begins to flow. The lubricating oil is squeezed from inside the cavity to oil outlet two and then sprayed out from the bottom of oil outlet two until the push rod is completely retracted into the punch, at which point the lubricating oil stops flowing. The second return spring is also fully pressed back; after the punch finishes punching the workpiece, the movable sleeve begins to move downward under the action of the second return spring. At the same time, the oil groove on the movable sleeve moves downward to cut off the opened oil outlet two. At this time, a negative pressure will be formed inside the cavity. The blocking ball falls under the action of the negative pressure. At this time, the second oil inlet opens, and new hydraulic oil enters the cavity to fill the cavity. The above steps can be repeated for the next processing. This lubrication device changes the internal structure of the punch and does not require the addition of additional spraying devices or other mechanisms. It is automatically triggered when the push rod is squeezed back by the workpiece during each punching, spraying hydraulic oil onto the working position of the punch of the workpiece, achieving the effect of saving space and precise lubrication.

[0017] Preferably, a square nozzle is fixedly installed at the bottom of the second oil outlet. When the lubrication device is working, the lubricating oil is sprayed out from the second oil outlet through the pressure of the movable sleeve during each processing. However, since the second oil outlet is too narrow, the lubricating oil can only act on a local area of ​​the workpiece. During processing, the position of the lubricating oil acting on the workpiece cannot completely correspond to the side of the punch, which weakens the lubrication effect. Adding a square nozzle at the bottom of the second oil outlet can expand the spray range and make the lubricating oil completely act on the processing position corresponding to the side of the punch.

[0018] Preferably, the bottom area of ​​the push rod is larger than the top area. Since the push rod is in contact with the workpiece, in order to avoid the push rod causing scratches or dents to the workpiece under the action of the elastic force of the return spring and gravity, which would reduce the quality of the processed product, the bottom area of ​​the push rod is increased. This reduces the pressure of the bottom of the push rod on the workpiece when pressing down and reduces the gap between the bottom of the push rod and the through hole. During the punching process, the elastic force of the return spring and the gravity of the push rod itself can be used to offset part of the stress generated by the through hole on the workpiece, thus avoiding plastic deformation of the workpiece.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention uses a lubrication device to accurately deliver lubricating oil to the mold processing position. Compared with the traditional lubrication method of evenly covering the entire surface of the workpiece by immersion, dripping, spraying, and brushing, this invention concentrates the lubricating oil at the local processing position, resulting in higher lubrication efficiency and better effect.

[0021] 2. Compared with the current lubrication method of spraying lubricating oil onto the workpiece, the present invention uses a lubrication device that saves more lubricating oil during the lubrication process, and the lubricating oil will not splash around and affect the normal operation of other equipment during the processing.

[0022] 3. Current lubrication methods require the additional installation of spraying devices and control systems in the stamping equipment, which takes up space and increases production costs. This invention achieves lubrication during the stamping process by directly improving the internal structure of the mold, saving space and eliminating the need for additional external devices and control systems, thus reducing production costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0024] Figure 2 For the present invention Figure 1 A partial sectional view of the control lever extending from section A;

[0025] Figure 3 For the present invention Figure 1A partial sectional view of the retracted control lever in section A;

[0026] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0027] Figure 5 For the present invention Figure 4 A partial sectional view of the extended push rod in section B;

[0028] Figure 6 For the present invention Figure 4 A partial sectional view of the retracted push rod in section B.

[0029] In the diagram: 1. Lower mold base; 2. Cavity mold; 3. Guide post; 4. Upper mold base; 5. Punch; 6. Oil inlet 1; 7. Oil outlet 1; 8. Control rod; 9. Oil passage hole; 10. Return spring 1; 11. Adjustment hole; 12. Pull ring; 13. Guide groove; 14. Rubber pad; 15. Oil inlet 2; 16. Oil outlet 2; 17. Cavity; 18. Movable sleeve; 19. Blocking ball; 20. Ball cover; 21. Push rod; 22. Return spring 2; 23. Square nozzle. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1, please refer to Figures 1 to 3 This embodiment describes the working state using the first type of lubrication device, as detailed below:

[0032] A stamping die for manufacturing metal includes a lower die base 1, a die cavity 2, guide pillars 3, an upper die base 4, and a punch 5. The die cavity 2 is fixedly installed on the top wall of the lower die base 1. Multiple guide pillars 3 are connected to the four corners of the top wall of the lower die base 1. A blanking port is opened in the center of the lower die base 1. The tops of the multiple guide pillars 3 are connected to the upper die base 4. The punch 5 is installed on the bottom wall of the upper die base 4. The punch 5 moves up and down with the die cavity 2 and cooperates with it. A lubrication device is installed inside the punch 5 to accurately deliver lubricating oil to the die processing position.

[0033] The lubrication device includes an oil inlet 6, an oil outlet 7, a control rod 8, and oil passage holes 9. The top of the punch 5 has a vertically oriented oil inlet 6, and multiple horizontally oriented oil outlet holes 7 are provided on the side wall. The middle ends of the oil inlet 6 and oil outlet holes 7 are connected. A sliding groove is provided inside the punch 5, and a small hole is provided on the bottom wall of the punch 5. A control rod 8, which cooperates with the sliding groove, is slidably installed in the sliding groove, and the bottom end of the control rod 8 cooperates with the small hole. Oil passage holes 9, which cooperate with the oil outlet holes 7, are provided around the top of the control rod 8. A return spring 10 is installed between the control rod 8 and the sliding groove. Multiple adjustment holes 11 are provided on the top of the punch 5. The top end of the control rod 8 extends out of the adjustment holes 11 and is connected to a pull ring 12. A guide groove 13 is provided on the side wall of the punch 5 below the oil outlet holes 7. A rubber pad 14 is installed at the bottom end of the control rod 8. The rubber pad 14 can be detachably installed at the bottom end of the control rod 8, and the rubber pad 14 can be of different heights.

[0034] Before processing, first connect the lubricating oil circuit to the input end of the oil inlet 6. Manually pull the pull ring 12 upwards to move the control lever 8 upwards, so that the oil passage 9 is aligned with the oil outlet 7. The oil outlet 7 is circulated, allowing the lubricating oil to slowly flow out from the oil inlet 6 and the oil outlet 7. Under the action of the guide groove 13, the lubricating oil is dispersed to both sides and evenly distributed on the entire side when it reaches the bottom of the punch 5, thus playing a pre-lubricating role. Then, start the stamping equipment. The upper die holder 4 will drive the punch 5 to move up and down in the vertical direction to achieve the processing purpose. The punch 5 begins to move downwards. The rubber pad 14 at the bottom of the control lever 8 first contacts the workpiece. At this time, it continues to move downwards, and the return spring 10 is compressed. The bottom of the punch 5 contacts the workpiece, and at the same time, the control lever 8 is pressed back into the punch 5. The oil passage 9 opened above the control lever 8 is aligned with the oil outlet 7, allowing the oil outlet 7 to circulate. The lubricating oil is then slowly flowing out from the oil outlet 7 through the oil inlet 6. The lubricating oil flows out slowly and disperses to both sides under the action of the guide groove 13, which lubricates the punch 5 and the workpiece. At this time, it continues to move downward. The punch 5 punches the workpiece. After the punching is completed, the elastic force of the return spring 10 will eject the middle part of the workpiece from the blanking port. At this time, the control rod 8 falls again under the action of gravity and the elastic force of the return spring 10. The bottom protrudes from the small hole again, and the position of the oil passage 9 is offset from the oil outlet 7, so the oil outlet 7 is closed. At this time, the lubricating oil stops flowing out. The upper die seat 4 drives the punch 5 back to the initial position. When the next part of the workpiece moves to the designated processing position, the processing is performed again. The above steps are automatically repeated without manual operation. The first lubrication device used in this embodiment changes the internal structure of the punch 5. When the control rod 8 is squeezed back by the workpiece during each punching, it is automatically triggered and acts directly on the bottom of the punch 5 on the side that acts on the workpiece. The lubrication effect is good, but it is necessary to manually pull the pull ring 12 for pre-lubrication during the first processing.

[0035] Example 2, please refer to Figures 4 to 6 This embodiment describes the working state using the second lubrication device, as detailed below:

[0036] The lubrication device includes an oil inlet 15, an oil outlet 16, a cavity 17, a movable sleeve 18, a blocking ball 19, a ball cover 20, a push rod 21, and a return spring 22. The cavity 17 is located inside the punch 5. An oil inlet 15, connected to the top wall of the cavity 17, is located on the top of the cavity 17. A ball cover 20 is fixedly installed on the top of the cavity 17. A blocking ball 19, which mates with the oil inlet 15, is movably installed inside the ball cover 20. Multiple oil outlets 16, connected to the side walls of the cavity 17, are located on the bottom wall of the punch 5. A movable sleeve 18 is slidably installed inside the cavity 17, and multiple oil passage grooves are opened around the movable sleeve 18 to cooperate with the oil outlet 16. A through hole is opened on the bottom wall of the punch 5. A push rod 21 that cooperates with the through hole is connected to the bottom of the movable sleeve 18, and a return spring 22 is installed between the bottom of the push rod 21 and the through hole. A square nozzle 23 is fixedly installed at the bottom of the oil outlet 7. The bottom area of ​​the push rod 21 is larger than the top area, and the clearance between the bottom of the movable sleeve 18 and the through hole is 0.1mm.

[0037] Before processing, lubricating oil is first connected to the oil inlet 15 to fill the cavity 17. When the stamping equipment is started, the punch 5 begins to move downwards. The push rod 21 at the bottom of the movable sleeve 18 first contacts the workpiece. The push rod 21 causes the movable sleeve 18 to move upwards, squeezing the lubricating oil inside the cavity 17. At the same time, the return spring 22 is compressed. At this time, the blocking ball 19 moves upwards with the liquid flow and pressure to block the oil inlet 15. The oil passage groove on the movable sleeve 18 also gradually moves to the position of the oil outlet 16. At this time, the normally cut-off oil outlet 16 begins to flow. The lubricating oil is squeezed from inside the cavity 17 to the oil outlet 16 and then flows out from the bottom of the oil outlet 16. The lubricating oil is sprayed out, and the spray range is expanded through the square nozzle 23, so that the lubricating oil is completely applied to the corresponding processing position on the side of the punch 5 until the push rod 21 is completely compressed back into the punch 5 and the lubricating oil stops flowing out. At the same time, the return spring 22 is also completely pressed back. After the punch 5 has finished punching the workpiece, the movable sleeve 18 begins to move downward under the action of the return spring 22. At the same time, the oil passage groove on the movable sleeve 18 moves downward and cuts off the opened oil outlet 16. At this time, a negative pressure will be formed inside the cavity 17. The blocking ball 19 falls onto the ball cover 20 under the action of the negative pressure. At this time, the oil inlet 15 opens, and new hydraulic oil enters the cavity 17 and fills the cavity 17. The above steps can be repeated for the next processing.

[0038] Compared with Example 1, Example 2 uses a lubrication device that acts directly on the punch 5, resulting in better lubrication. However, it requires pre-lubrication before stamping. Example 2 uses a lubrication device that acts on the workpiece, which is slightly less effective than Example 1. However, it does not require pre-lubrication before stamping and can be processed directly.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stamping type manufacturing metal mold comprising a lower die shoe (1), a die (2), a guide pillar (3), an upper die shoe (4), and a punch (5), wherein: The lower mold base (1) has a die (2) fixedly installed on its top wall. The lower mold base (1) has multiple guide pillars (3) connected to its top wall. The lower mold base (1) has a material discharge port at its center. The tops of the multiple guide pillars (3) are connected to an upper mold base (4). The upper mold base (4) has a punch (5) installed on its bottom wall. The punch (5) moves up and down with the die (2) through the upper mold base (4). The upper mold base (4) is characterized by further including a lubrication device. The punch (5) has a lubrication device installed inside it for accurately delivering lubricating oil to the mold processing position. The lubrication device includes an oil inlet (6), an oil outlet (7), a control rod (8), and an oil passage hole (9). The top of the punch (5) has an oil inlet (6) in the vertical direction. The side wall of the punch (5) has multiple oil outlets (7) in the horizontal direction. The oil inlet (6) and the oil outlet (7) are connected. The punch (5) has a sliding groove inside and a small hole on the bottom wall. The control rod (8) is slidably installed in the sliding groove. The bottom end of the control rod (8) cooperates with the small hole. The control rod (8) has multiple oil passage holes (9) that cooperate with the oil outlet (7). The top of the punch (5) has multiple adjustment holes (11). The top of the control rod (8) extends out of the adjustment holes (11) and the top of the control rod (8) is connected to a pull ring (12). Alternatively, the lubrication device includes an oil inlet (15), an oil outlet (16), a cavity (17), a movable sleeve (18), a blocking ball (19), a ball cover (20), a push rod (21), and a return spring (22). The cavity (17) is provided inside the punch (5), and the oil inlet (15) is provided on the top wall of the punch (5) to connect with the top wall of the cavity (17). The ball cover (20) is fixedly installed on the top of the cavity (17), and a component movably installed inside the ball cover (20) is connected to the oil inlet (15). The punch (5) has multiple oil outlets (16) on its bottom wall that connect to the side wall of the cavity (17). A movable sleeve (18) is slidably installed in the cavity (17). Multiple oil passage grooves that cooperate with the oil outlets (16) are provided around the movable sleeve (18). A through hole is provided on the bottom wall of the punch (5). A push rod (21) that cooperates with the through hole is connected to the bottom of the movable sleeve (18). A return spring (22) is installed between the bottom of the push rod (21) and the through hole.

2. The press-type manufacturing metal mold according to claim 1, characterized by: A reset spring (10) is installed between the control rod (8) and the sliding groove.

3. The press-type manufacturing metal mold according to claim 1, characterized by: The side wall of the punch (5) is provided with a guide groove (13) that communicates with the oil outlet (7).

4. The press-type manufacturing metal mold according to claim 1, characterized by: A rubber pad (14) is installed at the bottom of the control lever (8).

5. The press-type manufacturing metal mold according to claim 4, characterized by: The rubber pad (14) is detachably mounted on the bottom of the control rod (8).

6. The press-type manufacturing metal mold according to claim 1, characterized by: A square nozzle (23) is fixedly installed at the bottom of the oil outlet (7).

7. The press-type manufacturing metal mold according to claim 1, characterized by: The bottom area of ​​the push rod (21) is larger than the top area.

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