CN211564152U - Punch press for pressing die after passing through bottom dead center position - Google Patents
Punch press for pressing die after passing through bottom dead center position Download PDFInfo
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- CN211564152U CN211564152U CN201922332459.2U CN201922332459U CN211564152U CN 211564152 U CN211564152 U CN 211564152U CN 201922332459 U CN201922332459 U CN 201922332459U CN 211564152 U CN211564152 U CN 211564152U
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Abstract
The utility model provides a cross punch press of die holding behind bottom dead center position, it makes the mould accuracy stop at the bottom dead center, ensures that the processing of punch press is accurate reliable. It includes: a lower die; the punch is positioned above the lower die; the upper die is arranged at the bottom end of the punch; a transmission mechanism; and a stop position; the pushing mechanism is arranged between the punch and the transmission mechanism, the transmission mechanism can drive the punch to move through a bottom dead center position through the pushing mechanism and stop at a stop position, and the pushing mechanism is arranged to drive the punch and the upper die to move towards the lower die when the punch and the upper die stop at the stop position so that the upper die is tightly pressed on the lower die.
Description
Technical Field
The utility model relates to a technical field of punch press structure specifically is a punch press of die assembly mould after crossing bottom dead center position.
Background
A conventional hot stamping process heats a workpiece such as a plate material to a predetermined temperature, and then punches the workpiece through a punch to form a desired shape. The cooling runner in the die of the punch press is used for cooling water to circulate, so that the low-temperature die can quench the formed workpiece, and the strength of the quenched workpiece can be improved to over 1450 MPa.
The mechanical punching machine uses the flywheel to drive the crankshaft to rotate, and the crankshaft can drive the punch to move when rotating, so that the upper die moves from the top dead center position to the bottom dead center position and punches the workpiece. The punch stops at the bottom dead center position and a predetermined quenching time elapses to quench the workpiece by the upper and lower dies. Then, the crankshaft drives the punch to move upward to return the upper mold to the top dead center position. Since it takes a certain time and distance for the brakes to brake the crank shaft until the crank shaft actually stops rotating, it is difficult to stop the upper mold exactly at the position of the bottom dead center 180 degrees. If the upper die is not in the bottom dead center position, the upper die cannot be reliably adhered to the lower die, and therefore, the workpiece is easily deformed during the quenching process, and the dimensional accuracy of the quenched workpiece is poor.
Disclosure of Invention
To the above problem, the utility model provides a cross punch press of die assembly mould behind bottom dead center position, it makes the mould accuracy stop at the bottom dead center, ensures that the processing of punch press is accurate reliable.
The utility model provides a cross punch press of die holding back after bottom dead center position which characterized in that, it includes:
a lower die;
the punch is positioned above the lower die;
the upper die is arranged at the bottom end of the punch;
a transmission mechanism; and
a stop position;
the pushing mechanism is arranged between the punch and the transmission mechanism, the transmission mechanism can drive the punch to move through a bottom dead center position through the pushing mechanism and stop at a stop position, and the pushing mechanism is arranged to drive the punch and the upper die to move towards the lower die when the punch and the upper die stop at the stop position so that the upper die is tightly pressed on the lower die.
It is further characterized in that: the transmission mechanism comprises a crank shaft which is arranged to stop at any angle between 180 degrees and 189 degrees so as to stop the punch at the stop position;
the pushing mechanism comprises at least one ejector arranged between the punch and the transmission mechanism, and the ejector is used for driving the punch and the upper die to move towards the lower die;
the ejector comprises an oil hydraulic cylinder arranged at the bottom end of the transmission mechanism, a piston group which can move up and down relative to the oil hydraulic cylinder and is connected with the punch, and at least one clamping group which can clamp the piston group in a clamping-releasing manner and enables the piston group to be fixed on the oil hydraulic cylinder;
the clamping group is provided with a clamping rod, and the clamping rod can move between a clamping position for clamping the piston group and a releasing position for releasing the piston group;
the oil hydraulic cylinder is provided with an upper flange, an upper guide hole is formed in the upper flange, the piston group is provided with a lower flange, a lower guide hole is formed in the lower flange, the clamping group is also provided with a pressure cylinder arranged at the top end of the upper flange, the clamping rod is provided with a rod body penetrating through the upper guide hole and the lower guide hole, a piston formed at the top end of the rod body and positioned in the pressure cylinder, and a clamping block formed at the bottom end of the rod body and used for clamping the bottom end of the lower flange;
the pushing mechanism comprises a plurality of ejectors arranged between the punch and the transmission mechanism;
the ejector comprises a plurality of clamping groups which are spaced from each other.
After the technical scheme is adopted, the pushing mechanism is arranged to drive the punch and the upper die to move towards the lower die when the pushing mechanism is at the stop position, so that the upper die is tightly pressed on the lower die, and the problem that the punch cannot be accurately stopped at the bottom dead center position to cause a gap to be generated between the lower die and the upper die can be solved. Therefore, the workpiece can be prevented from being deformed in the quenching process, and the size precision of the quenched workpiece is improved.
Drawings
FIG. 1 is a front view of one embodiment of the present novel punch press capable of passing a bottom dead center position and thereafter clamping a mold illustrating a punch in a top dead center position;
FIG. 2 is a fragmentary cross-sectional view of an ejector of an embodiment, illustrating a clamping bar in a clamping position
FIG. 3 is a front view of the embodiment illustrating the punch in a bottom dead center position;
FIG. 4 is an operational view of a crank section of a crankshaft illustrating rotation of the crank section to a 180 degree position according to an embodiment;
FIG. 5 is a front view of the embodiment illustrating the punch in a stop position;
FIG. 6 is an operational view of the crank section of the embodiment crank axle illustrating the crank section rotated to a 189 degree position;
FIG. 7 is a fragmentary cross-sectional view of the ejector of the embodiment, illustrating the clamping bar in a release position;
FIG. 8 is a fragmentary cross-sectional view of the ejector of the embodiment, illustrating a piston assembly being pushed downward by hydraulic oil;
FIG. 9 is a fragmentary front view of the embodiment, illustrating an upper mold in a press position in which it is pressed tightly against a lower mold;
the names corresponding to the sequence numbers in the figure are as follows:
1. workpiece
200 punch press
2. base
21. seat body
22. top plate
3. frame
4. lower punch assembly
41. carrying plate
42. lower die
5. upper punch assembly
51. punch
52. upper die
6. transmission mechanism
61 crank shaft
611 middle shaft section
612 crank section
613 side shaft section
62. connecting rod
63. flywheel
64. brake
65. piston
7-pushing mechanism
71-pusher
711 oil hydraulic cylinder
712 piston group
713 clamp the group.
Detailed Description
A press for pressing a mold after passing a bottom dead center position, see fig. 1-9:
referring to fig. 1, an embodiment of the present invention is a punch 200 capable of pressing a mold after passing through a bottom dead center position, and is suitable for punching a workpiece 1, where the workpiece 1 is a metal plate, for example.
The punch 200 is a mechanical punch and includes a base 2, a frame 3, a lower punch assembly 4, an upper punch assembly 5, a transmission mechanism 6, and a pushing mechanism 7.
The base 2 includes a base body 21 and a top plate 22 disposed on the top end of the base body 21. The frame 3 is disposed on the top of the seat body 21 of the base 2. The lower punch assembly 4 includes a carrier plate 41 and a lower die 42. The bearing plate 41 is mounted and fixed on the top end of the top plate 22 of the base 2 in a laterally movable manner. The lower mold 42 is disposed on the top of the supporting plate 41 for supporting the workpiece 1. The upper punch assembly 5 is located above the lower punch 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 an up-and-down direction. The upper die 52 is provided at the bottom end of the punch 51 and can cooperate with the lower die 42 to punch the workpiece 1.
The transmission mechanism 6 includes a crankshaft 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 central shaft section 611, two crank sections 612, and two side shaft sections 613. Two crank segments 612 are connected to opposite ends of the central shaft segment 611. The two side shaft sections 613 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 flywheels 63 are disposed on the corresponding side shaft sections 613, and the flywheels 63 are connected to a driving mechanism (not shown) and can be driven by the driving mechanism to rotate, so that the flywheels 63 can drive the crank shaft 61 to rotate. The brakes 64 and the pistons 65 are disposed on the corresponding side shaft sections 613, and the pistons 65 are used to drive the brakes 64 to operate, so that the brakes 64 brake the crankshaft 61 to stop the rotation of the crankshaft 61.
Referring to fig. 1 and 2, the pushing mechanism 7 includes two pushing devices 71, and the two pushing devices 71 are respectively disposed between the bottom ends of the two connecting rods 62 and the punch 51. Each of the ejectors 71 includes a hydraulic cylinder 711, a piston set 712, and a plurality of clamping sets 713. The hydraulic cylinder 711 can be fixed to the bottom end of the corresponding connecting rod 62 by, for example, a screw fastening method or a welding method. The oil cylinder 711 is formed with a chamber 714, and a flow passage 715 communicating with the chamber 714. The flow passage 715 is in communication with an external oil supply mechanism (not shown) that can supply the hydraulic oil 710 into the chamber 714 or recover the hydraulic oil 710 discharged from the chamber 714 through the flow passage 715. The cylinder 711 has an upper flange 716 adjacent to the bottom end thereof, and 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 is movable up and down with respect to the hydraulic cylinder 711 and has a piston 718 and a piston rod 719. The piston 718 is received within the chamber 714 of the oil hydraulic cylinder 711. The piston rod 719 is formed at the bottom end of the piston 718, for example, in an integral manner, and the bottom end of the piston rod 719 can be fixedly connected to the punch 51, for example, by screwing or welding. The plunger 719 has a lower flange 720 with a ring shape adjacent to the top end, 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 being communicated with the upper guide holes 717, respectively.
Each clamping group 713 of the present embodiment is exemplified by a hydraulic clamping cylinder, and each clamping group 713 can clamp the piston group 712 to the hydraulic cylinder 711 so as to release the clamping. Each clamping group 713 has a cylinder 722 and a clamping rod 723. The pressing cylinder 722 is fixed to the top end of the upper flange 716 by, for example, welding or other suitable fixing means, and the pressing cylinder 722 forms a chamber 724, a first through hole 725 communicating with one side of the chamber 724, and a second through hole 726 communicating with the top end of the chamber 724. Chamber 724 is located above a corresponding upper via 717. The first through hole 725 is connected between a lower oil chamber 727 of the chamber 724 and an oil supply mechanism (not shown), and the oil supply mechanism can supply hydraulic oil 728 into the lower oil chamber 727 or recover the hydraulic oil 728 discharged from the lower oil chamber 727 through the first through hole 725. The second through hole 726 communicates between an upper oil chamber portion 729 of the chamber 724 and the oil supply mechanism, and the oil supply mechanism can supply hydraulic oil 728 into the upper oil chamber portion 729 through the second through hole 726 or recover the hydraulic oil 728 discharged from the upper oil chamber portion 729.
The clamping rod 723 has a rod 730, a piston 731, and a clamping block 732. The rod 730 is disposed through the corresponding upper guide hole 717 and the corresponding lower guide hole 721 communicated therewith, and can move up and down along the extending direction of the upper guide hole 717 and the lower guide hole 721. A piston 731 is formed at the top end of the rod 730 and is located in the chamber 724 of the cylinder 722, and the piston 731 divides the chamber 724 into a lower oil chamber 727 and an upper oil chamber 729. The clamping block 732 is formed at the bottom end of the rod 730 and located below the lower flange 720 for clamping the bottom end of the lower flange 720.
The hydraulic oil 728 is supplied into the lower oil chamber 727 by the oil supply mechanism, and the piston 731 is pushed upward by the hydraulic oil 728, so that the clamping rod 723 moves upward. When the clamping block 732 contacts and is stopped by the lower flange 720, the clamping block 732 moves the lower flange 720 upward. When the lower flange 720 contacts and is stopped by the upper flange 716, the clamping rod 723 cannot move upwards any further, and the clamping rod 723 is positioned at a clamping position (shown in fig. 2) for clamping the lower flange 720 to fix the piston assembly 712 to the hydraulic cylinder 711. By supplying hydraulic oil 728 into the upper oil chamber 729 by the oil supply mechanism, the piston 731 is pushed downward by the hydraulic oil 728, so that the clamping rod 723 moves downward. When the piston 731 contacts and is stopped by the cylinder 722, the clamping rod 723 cannot move downward any further, and the clamping rod 723 is positioned at a release position (shown in fig. 5) that releases the lower flange 720 of the piston assembly 712. The supply of the hydraulic oil 728 into the lower oil chamber portion 727 or the upper oil chamber portion 729 is controlled by an oil supply mechanism so that the clamping rod 723 can be moved between the clamping position and the releasing position.
The operation of the punch 200 will be described in detail below:
referring to fig. 1, 2, 3 and 4, in the press 200 of the present embodiment, when the hot stamping process is performed, the clamping rods 723 of the clamping group 713 of each ejector 71 are positioned at the clamping position. When the driving mechanism drives the transmission mechanism 6 to operate, when the crank section 612 of the crank shaft 61 of the transmission mechanism 6 rotates from the 0 degree position to the 180 degree position, the crank section 612 drives the punch 51 to move downward from a top dead center position shown in fig. 1 to a bottom dead center position shown in fig. 3 along a downward moving direction D1 through the connecting rod 62 and the pushing mechanism 7, so that the upper die 52 is matched with the lower die 42 and presses the workpiece 1.
Referring to fig. 3, 5 and 6, the punch 51 of the upper punch assembly 5 is configured to pass through the bottom dead center position and then stop at a stop position as shown in fig. 5. Specifically, an encoder (not shown) senses the rotation of the crankshaft 61 from the 0 degree position of fig. 4 to a predetermined angle close to 180 degrees or equal to 180 degrees, and generates a control signal, and a controller (not shown) receives the control signal and controls the driving mechanism to stop, and controls the piston 65 to drive the brake 64 to brake the crankshaft 61. Therefore, the crank section 612 of the crank shaft 61 can be stopped at any angle position between 180 degrees and 189 degrees when the rotation is stopped, so that the punch 51 can be stopped at the stop position through the bottom dead center position. In the present embodiment, the crank section 612 of the crank shaft 61 is stopped at 189 degrees as shown in fig. 6. Since the punch 51 is pulled upward by the crank shaft 61 through the connecting rod 62 and the ejector mechanism 7 in an upward moving direction D2 after passing through the bottom dead center position, when the punch 51 stops at the stop position, the bottom end of the upper die 52 is separated from the top end of the lower die 42 by a small gap S as shown in fig. 4.
Referring to fig. 5 and 7, when the encoder senses that the crankshaft 61 stops rotating, the encoder generates another control signal, and the controller receives the control signal and controls the oil supply mechanism to supply the hydraulic oil 728 into the upper oil chamber 729 of each clamping group 713, so that the hydraulic oil 728 pushes the piston 731 downward in the downward moving direction D1 to move the clamping rod 723 downward to the release position.
Referring to fig. 8 and 9, the oil supply mechanism then supplies hydraulic oil 710 into the chamber 714 through the flow passage 715 of each ejector 71, and the hydraulic oil 710 pushes the piston 718 downward along the downward moving direction D1, so that the piston group 712 pushes the punch 51 downward to drive the upper die 52 to move downward. When the upper die 52 is moved down to a press-fit position (shown in fig. 9) where it is pressed tightly against the lower die 42, the upper die 52 is stopped by the lower die 42 from moving down further and is positioned at the press-fit position, whereby a gap S between the bottom end of the upper die 52 and the top end of the lower die 42 can be eliminated. Since the workpiece 1 is deformed into a predetermined shape after the punch 51 passes through the bottom dead center position, the upper die 52 does not need to apply a load for deforming the workpiece 1 to the workpiece 1 during the downward movement, and the hydraulic oil 710 can smoothly move the piston 718 downward without applying an excessive pushing force thereto.
The upper die 52 stops at the press-fit position for a predetermined quenching time, and cooling channels (not shown) in the upper die 52 and the lower die 42 are supplied with cooling water for circulation, so that the upper die 52 and the lower die 42 quench the formed workpiece 1. Since the upper die 52 can be stably positioned at the press-fit position by the pushing force of the hydraulic oil 710 applied to the top end of the piston 718, the workpiece 1 can be prevented from being deformed during the quenching process, so as to improve the dimensional accuracy of the quenched workpiece 1.
Referring to fig. 2 and 5, after the predetermined quenching time, the oil supply mechanism supplies the hydraulic oil 728 into the lower oil chamber 727 of each clamping group 713, and the hydraulic oil 728 pushes the piston 731 upward in the upward direction D2 to move 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 plunger 719, the clamping block 732 pushes the lower flange 720 upward to drive the piston assembly 712 to move upward. When the clamping rod 723 returns to the clamped position, the piston assembly 712 returns to and is secured in the position of fig. 2. Then, the driving mechanism drives the transmission mechanism 6 to operate, and the transmission mechanism 6 drives the punch 51 to move upward along the upward moving direction D2 through the pushing mechanism 7 and return to the top dead center position shown in fig. 1.
It should be noted that, in the present embodiment, if the crank section 612 of the crank shaft 61 is just stopped at the 180 ° position so that the punch 51 is just stopped at the bottom dead center position, the ejectors 71 of the ejector mechanism 7 do not need to be actuated to eject the punch 51 downward. Only when the crank section 612 stops at a position over 180 degrees and the punch 51 stops at the stop position, the ejectors 71 of the ejector mechanism 7 are actuated to eject the punch 51 downward to eliminate the gap S between the lower die 42 and the upper die 52. In other embodiments of the present embodiment, the number of the connecting rods 62 and the number of the ejectors 71 may be one or two or more, respectively, according to the size of the punch 200. 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 may be one.
As described above, in the press machine 200 of the present embodiment, the pusher mechanism 7 is provided to drive the punch 51 and the upper die 52 to move toward the lower die 42 at the stop position, so that the upper die 52 is tightly pressed against the lower die 42, thereby eliminating the problem that the punch 51 cannot be accurately stopped at the bottom dead center position and the gap S is generated between the lower die 42 and the upper die 52. It can prevent that work piece 1 from producing the deformation in the quenching process to promote the dimensional accuracy of work piece 1 after the quenching, so can reach this neotype purpose.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a cross punch press of die holding back after bottom dead center position which characterized in that, it includes:
a lower die;
the punch is positioned above the lower die;
the upper die is arranged at the bottom end of the punch;
a transmission mechanism; and
a stop position;
the pushing mechanism is arranged between the punch and the transmission mechanism, the transmission mechanism can drive the punch to move through a bottom dead center position through the pushing mechanism and stop at a stop position, and the pushing mechanism is arranged to drive the punch and the upper die to move towards the lower die when the punch and the upper die stop at the stop position so that the upper die is tightly pressed on the lower die.
2. A press for past bottom dead center post-compression molding as claimed in claim 1, wherein: the transmission mechanism includes a crank shaft configured to stop at any angle between 180 degrees or more and 189 degrees to stop the ram at the stop position.
3. A press for past bottom dead center post-compression molding as claimed in claim 2, wherein: the pushing mechanism comprises at least one pusher arranged between the punch and the transmission mechanism, and the pusher is used for driving the punch and the upper die to move towards the lower die.
4. A press for past bottom dead center post-compression molding as claimed in claim 3 wherein: the ejector comprises an oil hydraulic cylinder arranged at the bottom end of the transmission mechanism, a piston group which can move up and down relative to the oil hydraulic cylinder and is connected with the punch, and at least one clamping group which can clamp the piston group in a clamping-releasing manner and enables the piston group to be fixed on the oil hydraulic cylinder.
5. The press for press-fitting a mold after passing through a bottom dead center position according to claim 4, wherein: the clamping group has a clamping lever movable between a clamping position to clamp the piston group and a release position to release the piston group.
6. A press for past bottom dead center post-compression molding as claimed in claim 5, wherein: the oil hydraulic cylinder is provided with an upper flange, an upper guide hole is formed in the upper flange, the piston group is provided with a lower flange, a lower guide hole is formed in the lower flange, the clamping group is further provided with a pressure cylinder arranged at the top end of the upper flange, the clamping rod is provided with a rod body penetrating through the upper guide hole and the lower guide hole, a piston formed at the top end of the rod body and located in the pressure cylinder, and a clamping block formed at the bottom end of the rod body and used for clamping the bottom end of the lower flange.
7. The press for press-fitting a mold after passing through a bottom dead center position according to any one of claims 3 to 6, wherein: the pushing mechanism comprises a plurality of ejectors arranged between the punch and the transmission mechanism.
8. The press for pressing a mold after passing through a bottom dead center position according to any one of claims 4 to 6, wherein: the ejector comprises a plurality of clamping groups which are spaced from each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922332459.2U CN211564152U (en) | 2019-12-23 | 2019-12-23 | Punch press for pressing die after passing through bottom dead center position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922332459.2U CN211564152U (en) | 2019-12-23 | 2019-12-23 | Punch press for pressing die after passing through bottom dead center position |
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| Publication Number | Publication Date |
|---|---|
| CN211564152U true CN211564152U (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922332459.2U Active CN211564152U (en) | 2019-12-23 | 2019-12-23 | Punch press for pressing die after passing through bottom dead center position |
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| Country | Link |
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| CN (1) | CN211564152U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743892A (en) * | 2020-12-23 | 2021-05-04 | 无锡市欧凯电子有限公司 | Node righting point selection stamping control method and press |
| CN113635382A (en) * | 2021-08-27 | 2021-11-12 | 汕头市盟星包装机械有限公司 | Mould capable of automatically adjusting and eliminating mould clearance during mould closing |
-
2019
- 2019-12-23 CN CN201922332459.2U patent/CN211564152U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743892A (en) * | 2020-12-23 | 2021-05-04 | 无锡市欧凯电子有限公司 | Node righting point selection stamping control method and press |
| CN112743892B (en) * | 2020-12-23 | 2021-08-27 | 无锡市欧凯电子有限公司 | Node righting point selection stamping control method and press |
| CN113635382A (en) * | 2021-08-27 | 2021-11-12 | 汕头市盟星包装机械有限公司 | Mould capable of automatically adjusting and eliminating mould clearance during mould closing |
| CN113635382B (en) * | 2021-08-27 | 2022-12-13 | 汕头市盟星包装机械有限公司 | Mould clearance is eliminated in compound die self-interacting |
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