CN110884184B - A crank press - Google Patents

Abstract

The present invention relates to the technical field of automobile parts processing, and discloses a crank press, comprising a bed, a crankshaft rotatably connected to the bed, a power mechanism for driving the crankshaft to rotate, a slider slidably arranged on the bed, and a connecting rod hinged to the crankshaft at one end and hinged to the slider at the other end. The present invention has the following advantages and effects: when processing workpieces such as automobile parts, the power mechanism drives the crankshaft to rotate, and the crankshaft drives the slider to reciprocate through the connecting rod to complete the stamping of the workpiece. A positioning bracket is arranged under the slider, and the positioning bracket also performs reciprocating linear motion to avoid the actual movement stroke of the slider being greater than the set stroke, so that the slider moves smoothly and the stamping process has high precision. At the same time, the worker can visually observe the guide column and the positioning bracket to judge whether there is any deviation in the slider stroke and movement state, which can effectively improve the yield rate during stamping.

Description

A crank press

Technical Field

The invention relates to the technical field of automobile parts processing, in particular to a crank press.

Background Art

As the foundation of the automotive industry, automotive parts are an essential factor in supporting the sustainable and healthy development of the automotive industry. Stamping is one of the common processes in the processing of automotive parts. The press and the die are used to apply external force to the material to cause plastic deformation or separation, so as to obtain the workpiece of the required shape and size. The crank press is a cold stamping equipment that uses a crank connecting rod as the working mechanism. In the process of processing automotive parts, the crank press is prone to aging after long-term use, especially after the slider and the bed are worn, and the crankshaft and the connecting rod are worn, which will cause the slider stamping stroke to be inaccurate, which is very likely to cause the problem of poor quality of automotive parts after stamping.

Summary of the invention

The object of the present invention is to provide a crank press which has the effect of improving the precision of the punching stroke.

The above technical purpose of the present invention is achieved through the following technical solutions: a crank press, comprising a bed, a crankshaft rotatably connected to the bed, a power mechanism for driving the crankshaft to rotate, a slider slidably arranged on the bed, and a connecting rod hinged to the crankshaft at one end and hinged to the slider at the other end; the bed is provided with a rotatable lead screw, a servo motor and a reducer installed on the bed for driving the lead screw to rotate; the lead screw sleeve is provided with a nut assembly, the slider is provided with a guide hole, the nut assembly is provided with a guide column passing through the guide hole, and the guide column is fixed with a positioning bracket located below the slider.

By adopting the above technical solution, when the crank press is working, the power mechanism drives the crankshaft to rotate, and the crankshaft drives the slider to reciprocate through the connecting rod. The output shaft of the servo motor is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to the lead screw. The servo motor and the reducer drive the lead screw to rotate, and the lead screw drives the nut assembly to move, thereby driving the guide column and the positioning bracket to move. The positioning bracket reciprocates with the slider. When the slider moves downward and breaks through the set stroke, the positioning bracket contacts and supports the slider to prevent the slider from continuing to slide downward, so as to improve the accuracy of the stamping stroke. When processing automotive parts, the slider moves smoothly and the processing accuracy is high.

The present invention is further configured as follows: a guide rail is fixed to the bed body, and the side wall of the nut assembly is slidably connected to the guide rail.

The present invention is further configured as follows: a receiving groove is provided on a side wall of the guide column, and the guide rail is placed in the receiving groove.

The present invention is further configured as follows: a positioning ring is fixed to the inner wall of the guide hole, and a coating 1 is provided on the outer wall of the guide column.

By adopting the above technical solution, when the side wall of the slider and the bed body are worn, the slider deflects in the horizontal direction. During the movement of the slider, the positioning ring at the guide hole contacts the outer wall of the guide column and scrapes off the coating on the outer wall of the guide column. The workers can visually observe that the coating on the outer wall of the guide column is scraped off, and thus determine that the slider has deflected during movement.

The present invention is further configured as follows: an upper die is fixed to the slider, a workbench is fixed to the bed, a die base is hinged to the workbench, and a lower die is fixed to the die base.

By adopting the above technical solution, the workpiece to be processed is placed on the lower die, and the slide block and the upper die move downward to process the workpiece.

The present invention is further configured as follows: the mold base is hinged with a hook portion 1, the mold base is provided with an elastic element for driving the hook portion 1 to press against the mold base, the guide column is provided with a hook portion 2, when the guide column moves downward, the hook portion 2 slides over the hook portion 1, and when the guide column moves upward, the hook portion 2 hooks the hook portion 1 and drives the mold base to flip.

By adopting the above technical solution, when the slider and the lower die move downward, the workpiece is stamped, the guide column moves downward, and the hook part 2 slides over the hook part 1. When the slider and the upper die move upward, the hook part 2 on the guide column hooks the hook part 1 on the die base, driving the die base and the lower die to flip, and the workpiece on the lower die is separated from the lower die, completing automatic unloading, avoiding manual unloading by workers, and improving the safety of the crank press when in use. After the hook part 2 of the guide column is separated from the hook part 1 of the die base, the die base is reset under the action of gravity.

The present invention is further configured as follows: the workbench is hinged with a swing arm, a buffer spring is fixed at one end of the swing arm, a through hole is opened on the workbench, and a positioning assembly is provided on the workbench; when the mold base flips over and contacts and pushes the swing arm to flip over, the buffer spring passes through the through hole and is located under the mold base, and the positioning assembly fixes the position of the swing arm.

By adopting the above technical solution, the mold base contacts and pushes the swing arm to flip after flipping, and the buffer spring of the swing arm passes through the through hole and is located under the mold base. When the mold base is reset under its own gravity, it contacts the buffer spring to prevent the mold base from directly hitting the workbench and generating harsh noise.

The present invention is further configured as follows: the workbench is provided with mounting holes distributed on one side of the swing arm, the positioning assembly includes a positioning block inserted into the mounting hole, a positioning spring with one end fixed to the inner wall of the mounting hole and the other end fixed to the positioning block, the positioning block is provided with a guide surface, and when the swing arm is flipped, the guide surface is subjected to force and drives the positioning block to move toward the mounting hole.

By adopting the above technical solution, when the swing arm is flipped after being pushed by the mold base, the guide surface on the positioning block contacts the swing arm, and the guiding positioning block moves away from the swing arm. When the swing arm moves through the positioning block, the positioning spring drives the positioning block to move, and the positioning block blocks the swing arm from resetting, thereby achieving the function of positioning the swing arm.

The present invention is further configured as follows: a second coating is provided on the upper end surface of the positioning bracket.

By adopting the above technical solution, when the actual movement stroke of the slider is greater than the preset stroke, the slider hits the positioning bracket when it moves to the lower end. After the worker visually observes the wear of the coating, it can be determined that the actual movement stroke of the slider exceeds the set stroke.

The present invention is further configured as follows: the power mechanism includes an electric motor.

The beneficial effects of the present invention are as follows: when processing workpieces such as automobile parts, the power mechanism drives the crankshaft to rotate, and the crankshaft drives the slider to reciprocate through the connecting rod to complete the stamping of the workpiece. A positioning bracket is set under the slider, and the positioning bracket also performs reciprocating linear motion to avoid the actual movement stroke of the slider being greater than the set stroke, so that the slider moves smoothly and the stamping process is high in precision. At the same time, the worker can visually observe the guide column and the positioning bracket to determine whether there is a deviation in the slider stroke and movement state, which can effectively improve the yield rate during stamping.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram showing the connection relationship among the lead screw, the nut assembly, the guide post, and the slider of the present invention.

FIG. 3 is a schematic diagram of the state of the swing arm and the mold base of the present invention.

FIG. 4 is a second schematic diagram of the state of the swing arm and the mold base of the present invention.

FIG. 5 is a schematic diagram showing the positional relationship between the swing arm and the workbench of the present invention.

FIG. 6 is an enlarged view of point A in FIG. 5 .

FIG. 7 is a schematic diagram of the structure of the positioning assembly of the present invention.

In the figure, 1. bed; 11. power mechanism; 12. crankshaft; 13. connecting rod; 2. slider; 21. guide hole; 3. lead screw; 31. nut assembly; 32. guide column; 321. hook part 2; 4. workbench; 41. table; 42. positioning seat; 421. mounting hole; 43. through hole; 44. notch; 5. servo motor; 51. reducer; 6. positioning assembly; 61. positioning block; 611. guide surface; 612. positioning spring; 7. swing arm; 71. buffer spring; 8. die base; 81. lower die; 82. hook part 1; 83. elastic element.

DETAILED DESCRIPTION

The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment: A crank press, as shown in FIG1 , comprises a bed 1, a crankshaft 12 rotatably connected to the bed 1, a power mechanism 11 for driving the crankshaft 12 to rotate, a slider 2 slidably arranged on the bed 1, and a connecting rod 13 hinged to the crankshaft 12 at one end and hinged to the slider 2 at the other end, wherein the power mechanism 11 is an electric motor. An upper die is mounted on the slider 2, a workbench 4 is fixed on the bed 1, a die base 8 is hinged on the workbench 4, and a lower die 81 is mounted on the die base 8. When the crank press is working, a workpiece is placed on the lower die 81, the power mechanism 11 drives the crankshaft 12 to rotate, and the crankshaft 12 drives the slider 2 to reciprocate through the connecting rod 13. When the slider 2 moves downward, the upper die on the slider 2 contacts and punches the workpiece, completing the punching process of the workpiece.

As shown in Figures 1 and 2, the bed 1 is equipped with a lead screw 3 rotatably connected to the bed 1, a servo motor 5 and a reducer 51 fixed on the bed 1, the output shaft of the servo motor 5 is connected to the input shaft of the reducer 51, and the output shaft of the reducer 51 is connected to the lead screw 3. A nut assembly 31 is sleeved on the lead screw 3, a guide rail is fixed on the bed 1, and the nut assembly 31 is embedded in the guide rail. A guide hole 21 is opened on the slider 2, and a guide column 32 is fixed on the outer wall of the nut assembly 31, and the guide column 32 passes downward through the guide hole 21. A positioning bracket is fixed on the guide column 32, and the positioning bracket is located below the slider 2. A positioning ring is fixed on the inner wall of the guide hole 21, and a coating 1 is provided on the outer wall of the guide column 32, and a coating 2 is provided on the upper end surface of the positioning bracket.

As shown in Fig. 2 and Fig. 3, a hook part 2 321 is fixed on the guide column 32, a hook part 1 82 is hinged on the die base 8, and an elastic element 83 is also fixed on the die base 8. The elastic element 83 is a spring, one end of the elastic element 83 is fixed to the die base 8 and the other end is fixed to the hook part 1 82. The die base 8 includes a blocking part located above the hook part 1 82, and the elastic force of the elastic element 83 drives the hook part 2 321 to abut against the blocking part. When the nut assembly 31 moves downward, the guide column 32 is driven to descend, and the hook part 2 321 slides over the hook part 1 82 and is located below the hook part 1 82. When the nut assembly 31 moves upward, the guide column 32 is driven to rise, and the hook part 2 321 hooks the hook part 1 82 during the rising process, driving the die base 8 to flip, and the processed workpiece slides off from the lower die 81, realizing automatic unloading. When the hook part 2 321 is separated from the hook part 1 82, the die base 8 moves downward and resets under its own gravity.

As shown in Fig. 3 and Fig. 4, a swing arm 7 is hinged in the workbench 4, and the workbench 4 is provided with a through hole 43 and a notch 44. A buffer spring 71 is fixed at one end of the swing arm 7, and the other end is located above the workbench 4 after passing through the notch 44. As shown in Fig. 3 to Fig. 7, a positioning assembly 6 is also provided at the workbench 4, and the workbench 4 includes a table body 41, two positioning seats 42 fixed on the table body 41, and the two positioning seats 42 are distributed on both sides of the swing arm 7, and a side wall of one of the positioning seats 42 is provided with a mounting hole 421, and the positioning assembly 6 includes a positioning block 61 inserted into the mounting hole 421, a positioning spring 612 fixed at one end to the positioning block 61 and at the other end to the inner wall of the mounting hole 421, and the positioning block 61 is provided with a guide surface 611. When the mold base 8 is turned up, the mold base 8 contacts and pushes the swing arm 7 to turn over, and the swing arm 7 contacts the guide surface 611 of the positioning block 61 and pushes the positioning block 61 to move toward the mounting hole 421. When the swing arm 7 slides over the positioning block 61, the positioning block 61 moves and resets under the elastic force of the positioning spring 612. One side wall of the swing arm 7 rests against the inner wall of the slot 44, and the other side wall is blocked by the positioning block 61. At this time, the position of the swing arm 7 is fixed, and the buffer spring 71 on the swing arm 7 passes through the through hole 43 of the workbench 4 and is located below the mold base 8. During the process of the mold base 8 moving downward and resetting under its own gravity, it contacts the buffer spring 71 to avoid directly hitting the workbench 4 and generating loud noise.

When the crank press is working: the power mechanism 11 drives the crankshaft 12 to rotate, the crankshaft 12 drives the slider 2 to reciprocate through the connecting rod 13, the output shaft of the servo motor 5 is connected to the input shaft of the reducer 51, the output shaft of the reducer 51 is connected to the screw 3, the servo motor 5 and the reducer 51 drive the screw 3 to rotate, the screw 3 drives the nut assembly 31 to move, and then drives the guide column 32 and the positioning bracket to move, the positioning bracket reciprocates with the slider 2, when the slider 2 moves downward and breaks through the set stroke, the positioning bracket contacts and supports the slider 2 to prevent the slider 2 from continuing to slide downward, so as to improve the accuracy of the stamping stroke. When processing automotive parts, the slider 2 moves smoothly and the processing accuracy is high.

Claims (5)

1. A crank press, characterized in that it comprises a bed (1), a crankshaft (12) rotatably connected to the bed (1), a power mechanism (11) for driving the crankshaft (12) to rotate, a slider (2) slidably arranged on the bed (1), a connecting rod (13) hinged to the crankshaft (12) at one end and hinged to the slider (2) at the other end, the bed (1) being provided with a lead screw (3) rotatably arranged, a servo motor (5) installed on the bed (1) for driving the lead screw (3) to rotate, and a reduction gear (6). The invention relates to a speed machine (51), wherein the lead screw (3) is sleeved with a nut assembly (31), the slider (2) is provided with a guide hole (21), the nut assembly (31) is provided with a guide column (32) passing through the guide hole (21), and the guide column (32) is fixed with a positioning bracket located below the slider (2); the bed (1) is fixed with a guide rail, and the side wall of the nut assembly (31) is slidably connected to the guide rail; the slider (2) is fixed with an upper mold, and the bed (1) is fixed with a workbench (4), and the workbench ( 4) is hingedly connected to a mold base (8), a lower mold (81) is fixed on the mold base (8); the mold base (8) is hingedly connected to a hook portion (82), the mold base (8) is provided with an elastic element (83) for driving the hook portion (82) to press against the mold base (8), the guide column (32) is provided with a hook portion (321), when the guide column (32) moves downward, the hook portion (321) slides over the hook portion (82), when the guide column (32) moves upward, the hook portion (321) hooks the hook portion (82) The mold base (8) is driven to flip after the mold base (8) flips; the workbench (4) is hinged with a swing arm (7), one end of the swing arm (7) is fixed with a buffer spring (71), the workbench (4) is provided with a through hole (43), and a positioning component (6) is provided on the workbench (4); when the mold base (8) flips and contacts and pushes the swing arm (7) to flip, the buffer spring (71) passes through the through hole (43) and is located below the mold base (8), and the positioning component (6) fixes the position of the swing arm (7). 2. A crank press according to claim 1, characterized in that a positioning ring is fixed to the inner wall of the guide hole (21), and a coating is provided on the outer wall of the guide column (32). 3. A crank press according to claim 1, characterized in that: the workbench (4) is provided with mounting holes (421) distributed on one side of the swing arm (7), the positioning assembly (6) comprises a positioning block (61) inserted into the mounting hole (421), and a positioning spring (612) fixed at one end to the inner wall of the mounting hole (421) and at the other end to the positioning block (61), the positioning block (61) is provided with a guide surface (611), and when the swing arm (7) is flipped, the guide surface (611) is subjected to force to drive the positioning block (61) to move toward the mounting hole (421). 4. A crank press according to claim 1, characterized in that: a second coating is provided on the upper end surface of the positioning bracket. 5. A crank press according to claim 1, characterized in that the power mechanism (11) comprises an electric motor.