TWM592388U - Punch press capable of pressing mold after passing through bottom dead center - Google Patents

Abstract

A punch press capable of pressing a die after passing through the bottom dead center position includes a lower die, a punch, an upper die, a transmission mechanism, and a pushing mechanism. The punch is located above the lower die. The upper die is arranged at the bottom end of the punch. The pushing mechanism is arranged between the punch and the transmission mechanism, and the transmission mechanism can drive the punch to move past the dead point position and stop at a stop position through the pushing mechanism, and the pushing mechanism is arranged at the stop In the position, the punch and the upper die are driven to move toward the lower die, so that the upper die is tightly pressed against the lower die. In this way, the workpiece can be prevented from being deformed during the quenching process to improve the dimensional accuracy of the quenched workpiece.

Description

Punch capable of pressing die after passing through the bottom dead center position

The present invention relates to a punching machine, especially a punching machine that can press the upper and lower dies after passing through the bottom dead center.

The existing hot stamping process is to heat a workpiece such as a sheet material to a predetermined temperature, and then stamp the workpiece through a punch to form a desired shape. The cooling flow channel in the die of the punch press allows cooling water to circulate, so that the low-temperature die quenches the formed workpiece, and the strength of the quenched workpiece can be increased to reach more than 1450MPa.

The mechanical punch press uses the flywheel to drive the crank shaft to rotate. When the crank shaft rotates, the punch moves, so that the upper die moves from the top dead center position to the bottom dead center position and presses the workpiece. The punch will stop at the bottom dead center and pass a predetermined quenching time, so that the upper and lower molds quench the workpiece. After that, the crank shaft will drive the punch to move up to restore the upper die to the top dead center position. It takes a period of time and distance for the brake to brake the crankshaft until the crankshaft actually stops rotating. Therefore, it is difficult to stop the upper mold exactly at 180 degrees at the bottom dead center. If the upper mold is not in the bottom dead center position, it cannot be firmly adhered to the lower mold, so it is easy to cause deformation of the workpiece during the quenching process, resulting in poor dimensional accuracy of the workpiece after quenching.

Therefore, an object of the present invention is to provide a punch capable of pressing the die after passing the bottom dead center position, which can overcome at least one disadvantage of the prior art.

Therefore, the novel press capable of pressing the die after passing through the bottom dead center position includes a die, a punch, an upper die, a transmission mechanism, and a pushing mechanism.

The punch is located above the lower die. The upper die is arranged at the bottom end of the punch. The pushing mechanism is arranged between the punch and the transmission mechanism, and the transmission mechanism can drive the punch to move past the dead point position and stop at a stop position through the pushing mechanism, and the pushing mechanism is arranged at the stop In the position, the punch and the upper die are driven to move toward the lower die, so that the upper die is tightly pressed against the lower die.

In the novel punching machine capable of pressing the die after passing through the bottom dead center position, the transmission mechanism includes a crank shaft, and the crank shaft is arranged to stop at any angle between 180 degrees and 189 degrees to make the punch Stop at the stop position.

In the novel punching machine capable of pressing the die after passing through the bottom dead center position, the pushing mechanism includes at least one pusher disposed between the punch and the transmission mechanism, and the pusher is used to drive the punch and the The upper mold moves toward the lower mold.

According to the novel punching machine capable of pressing the die after passing through the bottom dead center, the pusher includes a hydraulic cylinder arranged at the bottom end of the transmission mechanism, and a hydraulic cylinder which can move up and down relative to the hydraulic cylinder and is connected to the punch The piston group and at least one clamping group capable of clamping the piston group to be unfixed and fixed to the hydraulic cylinder.

In the novel press capable of pressing the die after passing through the bottom dead center position, the clamping group has a clamping rod, which can clamp the clamping position of the piston group at one clamping position, and one that releases the piston group Move between release positions.

In the novel press capable of pressing a die after passing through a bottom dead center position, the hydraulic cylinder has an upper flange, the upper flange forms an upper guide hole, the piston group has a lower flange, and the lower flange is formed with The lower guide hole, the clamping group also has a pressing cylinder arranged at the top of the upper flange, the clamping rod has a rod body penetrating through the upper guide hole and the lower guide hole, and a rod body formed on the rod body A piston at the top and located in the pressure cylinder, and a clamping block formed at the bottom end of the rod body for clamping the bottom end of the lower flange.

According to the novel punching machine capable of pressing the die after passing through the bottom dead center position, the pushing mechanism includes a plurality of pushing devices arranged between the punch and the transmission mechanism.

In the novel press capable of pressing the die after passing through the bottom dead center, the pusher includes a plurality of clamping groups spaced apart from each other.

The effect of the new model is that the pushing mechanism is set to drive the punch and the upper die to move toward the lower die when in the stop position, so that the upper die is tightly pressed against the lower die, and the punch cannot be stopped accurately. The position of the dead spot causes a gap between the lower mold and the upper mold. In this way, the workpiece can be prevented from being deformed during the quenching process to improve the dimensional accuracy of the quenched workpiece.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same number.

Referring to FIG. 1, it is an embodiment of the new punching machine 200 capable of pressing the mold after passing through the bottom dead center position, and is suitable for punching a workpiece 1. The workpiece 1 is an example of a metal plate.

The punch 200 is a mechanical punch and includes a base 2, a frame 3, a lower stamping assembly 4, an upper stamping assembly 5, a transmission mechanism 6, and a pushing mechanism 7.

The base 2 includes a base 21 and a top plate 22 disposed on the top of the base 21. The frame 3 is disposed on the top of the base 21 of the base 2. The lower stamping assembly 4 includes a bearing plate 41 and a lower die 42. The carrying plate 41 is fixed to the top end of the top plate 22 of the base 2 so as to be movable laterally. The lower die 42 is disposed on the top of the carrying plate 41 to carry the workpiece 1. The upper stamping assembly 5 is located above the lower stamping assembly 4 and includes a punch 51 and an upper die 52. The punch 51 is located in the frame 3 and can be guided by the frame 3 to move up and down in a vertical direction. The upper die 52 is disposed at the bottom end of the punch 51 and can cooperate with the lower die 42 to stamp the workpiece 1.

The transmission mechanism 6 includes a crank shaft 61, two connecting rods 62, a flywheel 63, a brake 64, and a piston 65. The crank shaft 61 is pivotally connected to the frame 3 and has a middle shaft section 611, two crank sections 612, and two side shaft sections 613. The two crank segments 612 are respectively connected to opposite ends of the central shaft segment 611. The shaft sections 613 on both sides are respectively connected to the ends of the two crank sections 612 opposite to the middle shaft section 611. The two connecting rods 62 are pivotally connected to the two crank segments 612 respectively. The flywheel 63 is disposed on the corresponding side shaft section 613. The flywheel 63 is connected to a driving mechanism (not shown) and can be driven to rotate by the driving mechanism, so that the flywheel 63 can drive the crank shaft 61 to rotate. The brake 64 and the piston 65 are disposed on the corresponding side shaft section 613. The piston 65 is used to drive the brake 64 to actuate, so that the brake 64 brakes the crank shaft 61 and stops the crank shaft 61 from rotating.

Referring to FIGS. 1 and 2, the ejector mechanism 7 includes two ejectors 71. The two ejectors 71 are respectively disposed between the bottom ends of the two connecting rods 62 and the punch 51. Each pusher 71 includes a hydraulic cylinder 711, a piston group 712, and a plurality of clamping groups 713. The hydraulic cylinder 711 can be fixed to the bottom end of the corresponding connecting rod 62 by, for example, a screw locking method or a welding method. The hydraulic cylinder 711 is formed with a cavity 714 and a flow channel 715 communicating with the cavity 714. The flow channel 715 communicates with an external oil supply mechanism (not shown). The oil supply mechanism can supply hydraulic oil 710 into the chamber 714 or the hydraulic oil 710 discharged from the recovery chamber 714 through the flow channel 715. The hydraulic cylinder 711 has an upper flange 716 having a ring shape near the bottom end. The upper flange 716 is formed with a plurality of upper guide holes 717 arranged in a ring shape and spaced apart from each other.

The piston group 712 can move up and down relative to the hydraulic cylinder 711 and has a piston 718 and a piston rod 719. The piston 718 is accommodated in the chamber 714 of the hydraulic cylinder 711. The piston rod 719 is integrally formed on the bottom end of the piston 718, for example, and the bottom end of the piston rod 719 can be fixedly connected to the punch 51 through, for example, screw locking or welding. The piston rod 719 has a ring-shaped lower flange 720 adjacent to the top, and the lower flange 720 can abut against the bottom end of the upper flange 716. The lower flange 720 is formed with a plurality of lower guide holes 721 arranged in a ring shape and spaced apart from each other. The lower guide holes 721 communicate with the upper guide holes 717, respectively.

Each clamping group 713 in this embodiment is an example of a hydraulic clamping cylinder. Each clamping group 713 can clamp the piston group 712 to be fixed to the hydraulic cylinder 711 without releasing clamping. Each clamping group 713 has a pressing cylinder 722 and a clamping rod 723. The pressing cylinder 722 can be fixed to the top of the upper flange 716 by, for example, welding or other suitable fixing methods. The pressing cylinder 722 is formed with a chamber 724, a first through hole 725 communicating with one side of the chamber 724, and a communicating with The second through hole 726 at the top of the chamber 724. The chamber 724 is located above the corresponding upper guide hole 717. The first through hole 725 communicates between the lower oil chamber portion 727 of the chamber 724 and the oil supply mechanism (not shown). The oil supply mechanism can supply hydraulic oil 728 into the lower oil chamber portion 727 through the first through hole 725 or The hydraulic oil 728 discharged from the lower oil chamber 727 is recovered. The second through hole 726 communicates between an oil chamber 729 of the chamber 724 and the oil supply mechanism. The oil supply mechanism can supply hydraulic oil 728 into the oil chamber 729 or recover the oil chamber through the second through hole 726 The hydraulic oil 728 discharged by the unit 729.

The clamping rod 723 has a rod body 730, a piston 731, and a clamping block 732. The rod body 730 penetrates the corresponding upper guide hole 717 and the corresponding lower guide hole 721 communicating therewith, and can move up and down along the extending direction of the upper guide hole 717 and the lower guide hole 721. The piston 731 is formed at the top of the rod body 730 and is located in the chamber 724 of the pressing cylinder 722. The piston 731 partitions the chamber 724 into a lower oil chamber portion 727 and an upper oil chamber portion 729. The clamping block 732 is formed at the bottom end of the rod body 730 and located below the lower flange 720 for clamping the bottom end of the lower flange 720.

By supplying the hydraulic oil 728 into the lower oil chamber portion 727 through the oil supply mechanism, the hydraulic oil 728 will push the piston 731 upward and move the clamping rod 723 upward. When the clamping block 732 contacts and is blocked by the lower flange 720, the clamping block 732 will drive the lower flange 720 to move upward. When the lower flange 720 contacts the upper flange 716 and is blocked by it, the clamping rod 723 cannot continue to move upward. At this time, the clamping rod 723 is positioned to clamp the lower flange 720 to fix the piston group 712 to the hydraulic pressure The clamping position of the cylinder 711 (as shown in FIG. 2). By supplying hydraulic oil 728 into the upper oil chamber portion 729 through the oil supply mechanism, the hydraulic oil 728 will push the piston 731 downward and move the clamping rod 723 downward. When the piston 731 contacts the pressure cylinder 722 and is blocked by it, the clamping rod 723 cannot continue to move downward. At this time, the clamping rod 723 is positioned at a release position of the lower flange 720 that releases the piston group 712 (see FIG. 5 Shown). The oil supply mechanism controls the supply of hydraulic oil 728 into the lower oil chamber portion 727 or the upper oil chamber portion 729 so that the clamping rod 723 can move between the clamping position and the release position.

The operation mode of the punch 200 will be described in detail below:

Referring to FIGS. 1, 2, 3 and 4, when the punch 200 of this embodiment performs a hot stamping process, the clamping rod 723 of the clamping group 713 of each pusher 71 is positioned at the clamping position. The driving mechanism will drive the transmission mechanism 6 to run. When the crank segment 612 of the crank shaft 61 of the transmission mechanism 6 rotates from the 0-degree position to the 180-degree position, the crank segment 612 will drive the punch 51 through a connecting rod 62 and the pushing mechanism 7 to drive the punch 51 from a The top dead center position shown in FIG. 1 moves down to the bottom dead center position shown in FIG. 3 in the downward movement direction D1, so that the upper mold 52 and the lower mold 42 cooperate and press the workpiece 1.

Referring to FIG. 3, FIG. 5 and FIG. 6, the punch 51 of the upper punch assembly 5 is set to stop at a stop position as shown in FIG. 5 after passing through the bottom dead center position. Specifically, when an encoder (not shown) senses that the crank shaft 61 rotates from the 0-degree position in FIG. 4 to a predetermined angle close to 180 degrees or equal to 180 degrees, the encoder generates a control signal, a After receiving the control signal, the controller (not shown) controls the driving mechanism to stop its operation, and at the same time controls the piston 65 to drive the brake 64 to brake the crankshaft 61. In this way, to ensure that the crank segment 612 of the crank shaft 61 stops rotating at any angular position between 180 degrees and 189 degrees, so that the punch 51 passes through the bottom dead center position and stops at the stop position. In this embodiment, the crank segment 612 of the crank shaft 61 is stopped at the 189-degree position shown in FIG. 6 as an example. After the punch 51 passes the bottom dead center position, it will be pulled upward by the crank shaft 61 through the connecting rod 62 and the pushing mechanism 7 in an upward direction D2 to move upward. Therefore, when the punch 51 stops at the stop position, The bottom end of the upper mold 52 will be separated from the top end of the lower mold 42 by a small gap S as shown in FIG. 4.

5 and 7, when the encoder senses that the crank shaft 61 stops rotating, the encoder generates another control signal. After receiving the control signal, the controller controls the oil supply mechanism to supply hydraulic oil 728 to each clamping group 713 In the upper oil chamber portion 729, the hydraulic oil 728 will push the piston 731 downward in the downward direction D1 to move the clamping rod 723 downward to the release position.

Referring to FIGS. 8 and 9, then, the oil supply mechanism supplies hydraulic oil 710 into the chamber 714 through the flow channel 715 of each ejector 71, and the hydraulic oil 710 will push the piston 718 downward in the downward direction D1. The piston group 712 pushes the punch 51 downward to drive the upper die 52 downward. When the upper mold 52 moves down to a pressing position tightly pressed together with the lower mold 42 (as shown in FIG. 9), the upper mold 52 is blocked by the lower mold 42 and cannot continue to move down and is positioned at the pressing By this position, the gap S between the bottom end of the upper mold 52 and the top end of the lower mold 42 can be eliminated. After the punch 51 passes through the bottom dead center position, the workpiece 1 has been punched and deformed into a predetermined shape. Therefore, during the downward movement of the upper die 52, there is no need to apply a load to the workpiece 1 to cause the workpiece 1 to deform. Therefore, the hydraulic oil 710 can smoothly move the piston 718 without applying excessive thrust to the piston 718.

When the upper mold 52 is in the pressing position, it will stop for a predetermined quenching time. During the aforementioned predetermined quenching time, the cooling flow channels (not shown) in the upper mold 52 and the lower mold 42 allow cooling water to flow, so that the upper mold 52 and the The lower die 42 quenches the formed workpiece 1. Since the thrust force exerted by the hydraulic oil 710 on the top of the piston 718 allows the upper mold 52 to be firmly positioned at the pressing position, the workpiece 1 can be prevented from being deformed during the quenching process to improve the dimensional accuracy of the quenched workpiece 1.

2 and FIG. 5, after a predetermined quenching time, the oil supply mechanism will supply hydraulic oil 728 to the lower oil chamber portion 727 of each clamping group 713, and the hydraulic oil 728 will move the piston 731 upward in the upward direction D2 The pushing pushes the clamping rod 723 upward. During the upward movement of the clamping rod 723, when the clamping block 732 contacts the bottom end of the lower flange 720 of the piston rod 719, the clamping block 732 pushes the lower flange 720 upward to drive the piston group 712 upward. When the clamping rod 723 returns to the clamping position, the piston set 712 returns to and is fixed at the position of FIG. 2. After that, the driving mechanism drives the transmission mechanism 6 to run, and the transmission mechanism 6 will drive the punch 51 through the pushing mechanism 7 to move upward in the upward movement direction D2 and return to the top dead center position shown in FIG. 1.

It should be noted that, in this embodiment, if the crank segment 612 of the crank shaft 61 just stops at the 180-degree position so that the punch 51 just stops at the bottom dead center position, each pusher 71 of the push mechanism 7 does not It is necessary to push the punch 51 downward. Only when the crank segment 612 stops at a position above 180 degrees and causes the punch 51 to stop at the stop position, each pusher 71 of the pushing mechanism 7 will actuate to push the punch 51 downward to eliminate the lower die 42 and The gap S between the upper molds 52. In other implementations of this embodiment, as the size of the punch 200 is different, the number of connecting rods 62 and the number of ejectors 71 may also be one or two or more each. In addition, by designing the shape of the clamping group 713 to be the same as the shape of the upper flange 716 and the lower flange 720, the number of the clamping group 713 can also be one.

In summary, the punch 200 of this embodiment is configured to drive the punch 51 and the upper die 52 toward the lower die 42 at the stop position by the pushing mechanism 7, so that the upper die 52 is tightly pressed against the lower die The method of 42 can eliminate the problem that the punch 51 cannot be accurately stopped at the bottom dead center and the gap S between the lower die 42 and the upper die 52 is generated. Thereby, the deformation of the workpiece 1 during quenching can be prevented to improve the dimensional accuracy of the workpiece 1 after quenching, so it can indeed achieve the purpose of new cost.

However, the above are only examples of the new model. When the scope of the new model cannot be limited by this, any simple equivalent changes and modifications made according to the patent application scope and patent specification content of the new model are still regarded as Within the scope of this new patent.

1: Workpiece 200: Punch 2: base 21: seat body 22: Top plate 3: rack 4: Lower stamping assembly 41: Carrying tablet 42: Lower mold 5: Upper stamping assembly 51: punch 52: Upper mold 6: Transmission mechanism 61: crank shaft 611: Middle shaft section 612: crank segment 613: Side shaft section 62: connecting rod 63: flywheel 64: Brake 65: Piston 7: Pushing mechanism 71: Pusher 710: hydraulic oil 711: hydraulic cylinder 712: Piston set 713: clamping group 714: Chamber 715: runner 716: Upper flange 717: Upper pilot hole 718: Piston 719: Piston rod 720: Lower flange 721: Lower guide hole 722: Cylinder 723: clamping rod 724: chamber 725: first through hole 726: Second through hole 727: Lower oil compartment 728: hydraulic oil 729: Oil Department 730: Rod body 731: Piston 732: clamping block D1: Move down D2: Move up S: gap

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a front view of an embodiment of a punch of the present invention that can press a die after passing through a bottom dead center position, illustrating a punch at a top dead center position; 2 is an incomplete cross-sectional view of an ejector of this embodiment, illustrating a clamping rod in a clamping position; FIG. 3 is a front view of the embodiment, illustrating that the punch is at a dead center position; 4 is a schematic diagram of an operation of a crank segment of a crank shaft of the embodiment, illustrating that the crank segment rotates to a 180 degree position; Figure 5 is a front view of the embodiment, illustrating the punch in a stopped position; 6 is a schematic diagram of an operation of the crank segment of the crank shaft of the embodiment, illustrating that the crank segment rotates to a position of 189 degrees; 7 is an incomplete cross-sectional view of the ejector of the embodiment, illustrating the clamping lever in a release position; 8 is an incomplete cross-sectional view of the pusher of the embodiment, illustrating that the hydraulic oil pushes a piston group downward; and FIG. 9 is an incomplete front view of the embodiment, illustrating a pressing position where an upper mold is tightly pressed against a lower mold.

1: Workpiece

200: Punch

2: base

21: seat body

22: Top plate

3: rack

4: Lower stamping assembly

41: Carrying tablet

42: Lower mold

5: Upper stamping assembly

51: punch

52: Upper mold

6: Transmission mechanism

61: crank shaft

611: Middle shaft section

612: crank segment

613: Side shaft section

62: connecting rod

63: flywheel

64: Brake

65: Piston

7: Pushing mechanism

71: Pusher

711: hydraulic cylinder

712: Piston set

713: clamping group

Claims (8)

A punch press capable of pressing a die after passing through the bottom dead center position includes: A mold A punch is located above the lower die; An upper die set at the bottom of the punch; A transmission mechanism; and A pushing mechanism is provided between the punch and the transmission mechanism. The driving mechanism can drive the punch through the dead point position and stop at a stop position through the pushing mechanism. The pushing mechanism is arranged at At the stop position, the punch and the upper die are driven toward the lower die, so that the upper die is tightly pressed against the lower die. The punch capable of pressing the die after passing through the bottom dead center position as described in claim 1, wherein the transmission mechanism includes a crank shaft, the crank shaft is arranged to stop at any angle between 180 degrees and 189 degrees To stop the punch at the stop position. The punch press capable of pressing the die after passing through the bottom dead center position according to claim 1, wherein the pushing mechanism includes at least one pusher disposed between the punch and the transmission mechanism, the pusher is used to The punch and the upper die are driven toward the lower die. The punch capable of pressing the die after passing through the bottom dead center position as described in claim 3, wherein the pusher includes a hydraulic cylinder provided at the bottom end of the transmission mechanism, and a movable up and down relative to the hydraulic cylinder and A piston group connected to the punch, and at least one clamping group capable of clamping the piston group to be unfixed and fixed to the hydraulic cylinder. The punch press capable of pressing the die after passing through the bottom dead center position as described in claim 4, wherein the clamping group has a clamping rod which can clamp the piston group at a clamping position, and As soon as the piston group is released, it moves between the release positions. The punch capable of pressing the die after passing through the bottom dead center position according to claim 5, wherein the hydraulic cylinder has an upper flange, the upper flange is formed with an upper guide hole, and the piston group has a lower flange, The lower flange is formed with a lower guide hole, the clamping group further has a pressing cylinder provided at the top of the upper flange, the clamping rod has a rod body which is penetrated between the upper guide hole and the lower guide hole, A piston formed at the top of the rod body and located in the pressure cylinder, and a clamping block formed at the bottom end of the rod body for clamping the bottom end of the lower flange. The punch capable of pressing the die after passing through the bottom dead center position according to any one of claims 3 to 6, wherein the pushing mechanism includes a plurality of pushers provided between the punch and the transmission mechanism . The punch capable of pressing a die after passing through the bottom dead center position according to any one of claims 4 to 6, wherein the pusher includes a plurality of clamping groups spaced apart from each other.

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