阅读说明：本技术 一种凸轮直驱的机械压力机 (Mechanical press directly driven by cam ) 是由 华林 胡志力 汪锐 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种凸轮直驱的机械压力机,包括机架、冲压滑块、凸轮轴和动力机构,凸轮轴通过轴承安装在机架上部,冲压滑块通过滑动副安装在机架上,冲压滑块包括顶部支架和中部支撑板,凸轮轴上设有两个主凸轮和一个回凸轮；冲压滑块的顶部支架设有与回凸轮顶部接触的上滚子,冲压滑块的中部支撑板设有与两个主凸轮底部接触的下滚子,两个主凸轮和一个回凸轮一起构成共轭凸轮；所述冲压滑块底部设有上工作台板,上工作台板下方的机架底部设有下工作台板；所述动力机构用于通过凸轮轴和共轭凸轮带动冲压滑块及其上的上工作台板上下运动,完成冲压动作。本发明能实现冲压滑块下死点长时精密保压,整体柔性大,刚性高,结构紧凑,稳定可靠。(The invention discloses a cam direct-driven mechanical press which comprises a rack, a stamping sliding block, a cam shaft and a power mechanism, wherein the cam shaft is arranged on the upper part of the rack through a bearing; the top support of the stamping slide block is provided with an upper roller which is contacted with the top of the return cam, the middle support plate of the stamping slide block is provided with a lower roller which is contacted with the bottoms of the two main cams, and the two main cams and the return cam form a conjugate cam together; an upper working table plate is arranged at the bottom of the stamping sliding block, and a lower working table plate is arranged at the bottom of the machine frame below the upper working table plate; the power mechanism is used for driving the stamping slide block and the upper working table plate on the stamping slide block to move up and down through the cam shaft and the conjugate cam so as to complete stamping action. The invention can realize long-term precise pressure maintaining of the bottom dead center of the stamping slide block, and has the advantages of large overall flexibility, high rigidity, compact structure, stability and reliability.)

1. The utility model provides a mechanical press that cam directly driven which characterized in that: the stamping slide block is a hollow slide block and at least comprises a top support and a middle support plate, two main cams and one return cam are arranged on the cam shaft, the two main cams are symmetrically distributed by taking the return cam as a center, and the phases of the two main cams are the same; the top support of the stamping slide block is provided with an upper roller which is contacted with the top of the return cam, the middle support plate of the stamping slide block is provided with a lower roller which is contacted with the bottoms of the two main cams, and the two main cams and the return cam form a conjugate cam together; the bottom of the stamping sliding block is provided with an upper working table plate, the bottom of the machine frame below the upper working table plate is provided with a lower working table plate, and the upper working table plate and the lower working table plate form a stamping working table together; the power mechanism is used for driving the cam shaft to rotate, and the rotation of the cam shaft drives the stamping slide block and the upper working table plate on the stamping slide block to move up and down through the conjugate cam to complete the stamping action.

2. The mechanical press according to claim 1, characterized in that: the power mechanism comprises four motors and a reduction gearbox, the reduction gearbox is fixedly mounted on the rack, the four motors are circumferentially distributed on the reduction gearbox, the cam shaft extends into the reduction gearbox, a large gear is arranged on the cam shaft at the end, four small gears meshed with the large gear are arranged on the periphery of the large gear in the reduction gearbox, and an output shaft of each motor extends into the reduction gearbox and then is in power transmission connection with one small gear.

3. The mechanical press according to claim 2, characterized in that: and the stamping sliding block is in gapless fit with a sliding pair on the rack by adopting a cylindrical roller.

4. The mechanical press according to claim 2, characterized in that: the cam shaft is arranged on the frame through four bearings, wherein the main cam and the return cam are arranged on the cam shaft between the two bearings in the middle, and the four bearings are symmetrically distributed by taking the return cam as the center.

5. The mechanical press according to claim 4, characterized in that: along the axial of camshaft, install an anti-swing slider through the bearing respectively between two adjacent bearings of both sides, anti-swing slider adopts sliding fit to link to each other with the punching press slider.

6. The mechanical press according to claim 4, characterized in that: and the upper bearing of the camshaft, the main cam and the return cam are directly provided with sleeves for axial positioning.

7. The mechanical press according to claim 2, characterized in that: the lower roller is installed on the middle supporting plate through the roller support, specifically, a plurality of pin shaft holes with different heights are formed in the middle supporting plate, the lower roller is installed on the roller support, the roller support is installed in the pin shaft holes through pin shafts, the roller support is installed in the pin shaft holes through selecting the pin shaft holes with different heights, the height of the lower roller is adjusted, and therefore the stroke of the stamping sliding block is adjusted.

8. The mechanical press according to claim 2, characterized in that: and balance cylinders connected with the stamping sliding blocks are respectively arranged on the frames on the two sides of the camshaft.

9. The mechanical press according to claim 2, characterized in that: the lower working table plate is arranged at the bottom of the frame through a plurality of hydraulic cylinders, and the height of the lower working table plate can be adjusted through the hydraulic cylinders, so that the relative stroke of the stamping slide block is adjusted.

10. The mechanical press according to claim 2, characterized in that: the long-time pressure maintaining of the stamping slide block at the bottom dead point is realized by designing the contour line of the conjugate cam, and the motion equation of the conjugate cam is as follows:

s₁＝h[(δ/δ₁)-sin(2πδ/δ₁)/(2π)](0≤δ≤δ₁)

s₁₁＝h-h[(δ/δ₁)-sin(2πδ/δ₁)/(2π)](π≤δ≤π+δ₁)

s₂＝h(δ₁≤δ≤δ₁+δ₂)

s₂₂＝0(π+δ₁≤δ≤π+δ₁+δ₂)

s₃＝h[1-(δ/δ₃)+sin(2πδ/δ₃)/(2π)](δ₁+δ₂≤δ≤δ₁+δ₂+δ₃)

s₃₃＝h-h[1-(δ/δ₃)+sin(2πδ/δ₃)/(2π)](π+δ₁+δ₂≤δ≤π+δ₁+δ₂+δ₃)

in the above formula, h is the stroke of the stamping slide block, the phase difference between the main cam and the return cam is 180 degrees, delta is the motion corner of the main cam, and s₁Is the push stroke motion curve of the main cam, s₁₁For the curve of the push stroke of the return cam, delta₁Is the total angle of rotation, s, of the main cam during its stroke movement₂Is the far resting motion curve of the main cam, s₂₂For the return cam far rest motion curve, δ₂Total angle of rotation, s, for main cam pressure maintaining₃Is the return motion curve of the main cam, s₃₃For the return-cam return-stroke motion curve, delta₃The total rotation angle of the main cam during return motion;

the pressure maintaining time is as follows:

wherein, T₁The dwell time T when the stamping slide block is stamped downwards₀Is the stamping cycle of the stamping slide motion.

Technical Field

The invention belongs to the technical field of forging and pressing equipment, relates to stamping equipment, and particularly relates to a mechanical press directly driven by a cam.

Background

The traditional press machine adopts a crank-slide block mechanism, a toggle rod mechanism, a screw mechanism, a multi-link mechanism and the like which are driven by a common motor to realize the bottom dead center pressure maintaining function, and the press machine adopting a servo system not only can realize variable speed regulation driving, but also can realize the bottom dead center pressure maintaining. However, the servo motor of the servo press is in an overload state in the lower dead point pressure maintaining process, the servo system is easy to break down due to long-time overload, and meanwhile, accumulated errors of the transmission system enable the sliding block to easily shake in the pressure maintaining process, so that the forming quality of drawn parts (such as 18650/21750 and other type battery cases) is influenced.

In order to realize precise pressure maintaining at the bottom dead center, patent document CN109228446A discloses a cam-driven multi-station press transmission system, which comprises a frame, a slide block and a main shaft, wherein the slide block is slidably mounted on the frame, an upper roller mechanism and a lower roller mechanism are mounted on the slide block at intervals, the main shaft is mounted on the frame, a main cam is mounted on the main shaft, the main shaft is located between the upper roller mechanism and the lower roller mechanism, and the main cam is respectively tangent to the upper roller mechanism and the lower roller mechanism. The patent adopts an equal-diameter cam mechanism with small system error to realize the stamping process of up-and-down reciprocating motion and pressure maintaining of the slide block. Patent document CN2704475Y discloses an open drawing press, which also adopts an equal diameter cam to drive to realize a similar process, however, after the motion law of the equal diameter cam follower within the range of 180 ° is determined, the other 180 ° motion law can only be determined according to the equal diameter condition, and there is a defect of freely designing motion law limitation; in addition, the equal-diameter cam press mechanism cannot change the stroke of the sliding block, is only suitable for stamping and forming of a single product, and has a narrow process window.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a cam direct-drive mechanical press. The invention adopts conjugate cam transmission, can realize the free design of the motion curve of a 360-degree driven part, can also meet the requirements of wider stamping process, and overcomes the defect that the equal-diameter cam mechanism can only design the curve within the range of 180 degrees; the invention adopts the conjugate cam lower roller position adjustable and hydraulic driven lower workbench, overcomes the defect that the stroke can not be adjusted by the technology, and simultaneously adopts a hydraulic system to realize overload protection. Meanwhile, a driven servo motor is replaced by a common motor, the servo motor stopping and pressure maintaining are replaced by mechanical high-precision pressure maintaining of normal rotation of the common motor, the specific forming process needing bottom dead center precision pressure maintaining is met, and particularly the hot stamping pressure maintaining process needing the plate to be always in close contact with a die and complete quenching is achieved. The invention adopts multi-motor drive, has large drive power, simple transmission chain of the conjugate cam mechanism, small accumulated error, compact structure, high rigidity and strength, large bearing capacity and high reliability.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a mechanical press that cam directly driven which characterized in that: the stamping slide block is a hollow slide block and at least comprises a top support and a middle support plate, two main cams and one return cam are arranged on the cam shaft, the two main cams are symmetrically distributed by taking the return cam as a center, and the phases of the two main cams are the same; the top support of the stamping slide block is provided with an upper roller which is contacted with the top of the return cam, the middle support plate of the stamping slide block is provided with a lower roller which is contacted with the bottoms of the two main cams, and the two main cams and the return cam form a conjugate cam together; the bottom of the stamping sliding block is provided with an upper working table plate, the bottom of the machine frame below the upper working table plate is provided with a lower working table plate, and the upper working table plate and the lower working table plate form a stamping working table together; the power mechanism is used for driving the cam shaft to rotate, and the rotation of the cam shaft drives the stamping slide block and the upper working table plate on the stamping slide block to move up and down through the conjugate cam to complete the stamping action.

Furthermore, the power mechanism comprises four motors and a reduction gearbox, the reduction gearbox is fixedly mounted on the frame, the four motors are circumferentially distributed on the reduction gearbox, the cam shaft extends into the reduction gearbox, a large gear is arranged on the cam shaft at the end, four small gears meshed with the large gear are arranged around the large gear in the reduction gearbox, and an output shaft of each motor extends into the reduction gearbox and then is in power transmission connection with one small gear.

Furthermore, a cylindrical roller is adopted between the stamping sliding block and a sliding pair on the frame in a gapless fit mode.

Furthermore, the camshaft is installed on the frame through four bearings, wherein the main cam and the return cam are installed on the camshaft between the two bearings in the middle, and the four bearings are symmetrically distributed by taking the return cam as the center.

Furthermore, along the axial of camshaft, install an anti-swing slider respectively through the bearing between two adjacent bearings of both sides, anti-swing slider adopts sliding fit to link to each other with the punching press slider.

Further, the camshaft upper bearing, the main cam and the return cam are directly provided with sleeves for axial positioning.

Further, the lower roller is installed on the middle supporting plate through a roller support, specifically, a plurality of pin shaft holes with different heights are formed in the middle supporting plate, the lower roller is installed on the roller support, the roller support is installed in the pin shaft holes through a pin shaft, the roller support is installed in the pin shaft holes through selecting the pin shaft holes with different heights, the height of the lower roller is adjusted, and therefore the stroke of the stamping sliding block is adjusted.

Furthermore, balance cylinders connected with the stamping sliding blocks are respectively arranged on the machine frames on the two sides of the cam shaft.

Furthermore, the lower working table plate is installed at the bottom of the frame through a plurality of hydraulic cylinders, and the height of the lower working table plate can be adjusted through the hydraulic cylinders, so that the relative stroke of the stamping slide block is adjusted.

Further, the long-time pressure maintaining of the stamping slide block at the bottom dead point is realized by designing the contour line of the conjugate cam, and the motion equation of the conjugate cam is as follows:

s₁＝h[(δ/δ₁)-sin(2πδ/δ₁)/(2π)] (0≤δ≤δ₁)

s₁₁＝h-h[(δ/δ₁)-sin(2πδ/δ₁)/(2π)] (π≤δ≤π+δ₁)

s₂＝h (δ₁≤δ≤δ₁+δ₂)

s₂₂＝0 (π+δ₁≤δ≤π+δ₁+δ₂)

s₃＝h[1-(δ/δ₃)+sin(2πδ/δ₃)/(2π)] (δ₁+δ₂≤δ≤δ₁+δ₂+δ₃)

s₃₃＝h-h[1-(δ/δ₃)+sin(2πδ/δ₃)/(2π)] (π+δ₁+δ₂≤δ≤π+δ₁+δ₂+δ₃)

in the above formula, h is the stroke of the stamping slide block, the phase difference between the main cam and the return cam is 180 degrees, delta is the motion corner of the main cam, and s₁Is the push stroke motion curve of the main cam, s₁₁For the curve of the push stroke of the return cam, delta₁Is the total angle of rotation, s, of the main cam during its stroke movement₂Is the far resting motion curve of the main cam, s₂₂For the return cam far rest motion curve, δ₂Total angle of rotation, s, for main cam pressure maintaining₃Is the return motion curve of the main cam, s₃₃For the return-cam return-stroke motion curve, delta₃The total rotation angle of the main cam during the return motion.

The pressure maintaining time is as follows:

wherein, T₁The dwell time T when the stamping slide block is stamped downwards₀Is the stamping cycle of the stamping slide motion.

The invention has the beneficial effects that: the driven servo motor can be replaced by a common motor, the servo motor stopping and pressure maintaining are replaced by mechanical high-precision pressure maintaining of normal rotation of the common motor, the specific forming process needing bottom dead center precision pressure maintaining is met, and particularly the hot stamping pressure maintaining process needing the plate to be always in close contact with a die and complete quenching is achieved. Meanwhile, the conjugate cam transmission is adopted, the free design of the motion curve of the 360-degree driven part can be realized, the wider stamping process requirement can be met, and the defect that the equal-diameter cam mechanism can only design the curve within the range of 180 degrees is overcome; the lower working table with the position adjustable lower roller of the conjugate cam and the hydraulic drive is adopted, the defect that the equal-diameter cam mechanism cannot realize stroke adjustment is overcome, and meanwhile, overload protection can be realized by adopting a hydraulic system. The invention realizes the design of different types of stamping slide block kinematic curves and long-term precise pressure maintaining of the bottom dead center of the slide block by designing the conjugate cam contour line. The invention adopts multi-motor drive, has large drive power, simple transmission chain of the conjugate cam mechanism, small accumulated error, compact structure, high rigidity and strength, large bearing capacity and high reliability.

Drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a front-side complete machine of a mechanical press according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a rear-side overall three-dimensional structure of a mechanical press according to an embodiment of the invention;

FIG. 3 is a two-dimensional assembly drawing of a transmission mechanism according to a first embodiment of the present invention;

FIG. 4 is a schematic diagram of an arrangement of four hydraulic cylinders according to a first embodiment of the present invention;

FIG. 5 is a schematic view of a stamping slide according to a first embodiment of the present invention;

FIG. 6 is a line graph of conjugate cams and roller profiles for a certain push stroke in accordance with a second embodiment of the present invention;

FIG. 7 is a profile diagram of conjugate cams of the second embodiment of the present invention;

FIG. 8 is a three-dimensional model of a conjugate cam and roller of a third embodiment of the present invention;

FIG. 9 is a process curve for stamping a slider according to a third embodiment of the present invention.

1-servo motor, 2-pinion, 3-angular contact ball bearing, 4-angular contact ball bearing, 5-bull gear, 6-flat key, 7-shaft end retainer, 8-screw, 9-first bearing, 10-first sleeve, 11-left box, 12-inner hexagon flat head screw, 13-beam, 14-right box, 15-reduction box retainer, 16-second sleeve, 17-second bearing, 18-anti-shaking slide block, 19-third sleeve, 20-third bearing, 21-fourth sleeve, 22-first main cam, 23-return cam, 24-upper roller, 25-second main cam, 26-stamping slide block, 27-left end cover, 28-cam main shaft, 29-flat key, 30-first lower roller, 31-a second lower roller, 32-a pin shaft, 33-a roller bracket, 34-a pin shaft hole, 35-an upper working table plate, 36-a lower working table plate, 37-a screw, 38-a hydraulic cylinder, 39-an oil channel, 40-a rack, 41-a middle supporting plate, 42-a top bracket and 43-a balance cylinder.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

The first embodiment is as follows: as shown in fig. 1 to 5, a cam direct-drive mechanical press comprises a frame 40, a stamping slide block 26, a cam shaft 28 and a power mechanism, wherein the cam shaft 28 is mounted on the upper portion of the frame 40 through a bearing, the stamping slide block 26 is mounted on the frame 40 through a sliding pair in the vertical direction, the stamping slide block 26 is a hollow slide block and comprises a top support 42 and a middle support plate 41, two main cams and a return cam 23 are arranged on the cam shaft 28, the two main cams are symmetrically distributed by taking the return cam 23 as a center, and the phases of the two main cams are the same; the top bracket 42 of the stamping slide block 26 is provided with an upper roller 24 which is contacted with the top of the return cam 23, the middle supporting plate 41 of the stamping slide block is provided with a lower roller which is contacted with the bottoms of the two main cams, and the two main cams and the return cam form a conjugate cam together; an upper working table plate 35 is arranged at the bottom of the stamping slide block 26, a lower working table plate 36 is arranged at the bottom of the machine frame below the upper working table plate 35, and the upper working table plate and the lower working table plate form a stamping working table together; the power mechanism is used for driving the camshaft to rotate, and the rotation of the camshaft 28 drives the stamping slide block 26 and the upper working table plate 35 thereon to move up and down through the conjugate cam, so that the stamping action is completed.

The power mechanism comprises four servo motors which are driven in parallel and have the same power, output shafts of the four motors are respectively connected with small gears in the reduction box, the four small gears drive a large gear together, and the large gear drives the cam shaft to rotate.

Four servo motors are distributed on a right box body 14 in a 90-degree circumferential manner, the right end face of a left box body 11 is matched with the left end face of the right box body 14, the right box body 14 of the left box body 11 is precisely connected with six hexagon socket head cap screws 12 uniformly distributed in the circumferential direction, output shafts of the four servo motors are respectively connected with four pinions 2 in a gearbox formed by the left box body 11 and the right box body 14 through splines, the four pinions 2 are uniformly distributed in the gearbox formed by the left box body 11 and the right box body 14, two end shafts of the four pinions 2 are respectively matched with four pairs of angular contact ball bearings 3 and 4 arranged in the left box body 11 and the right box body 14, the left end of the left box body 11 is fixedly connected with a cross beam 13, the right end of the right box body 14 is matched with a reduction box retainer ring 15, the reduction box retainer ring 15 is fixed on the cross beam 13 through screws, the cross beam 13 is welded on a rack 40, and the four pinions 2 in the gearbox drive a large gear 5 to rotate together, the large gear 5 transmits torque to the cam main shaft 28 through the flat key 6, the left end of the large gear 5 is matched with the right end of the first sleeve 10, the right end of the large gear 5 is pressed by the shaft end check ring 7, the shaft end check ring 7 is fixed at the right end of the cam main shaft 28 through the screw 8, and the left end of the first sleeve 10 abuts against the first bearing 9.

As shown in fig. 3, the cam main shaft 28 is of a left-right symmetrical structure from right to left along the axial direction of the cam main shaft 28, and a right end cover 43, a first bearing 9, a second sleeve 16, a second bearing 17, a third sleeve 19, a third bearing 20, a first main cam 22, a return cam 23, a second main cam 25, a fourth sleeve 21, a third bearing 20, a third sleeve 19, a second bearing 17, a second sleeve 16, a first bearing 9 and a left end cover 27 are sequentially mounted on the cam main shaft 28 from right to left, specifically, the cam main shaft 28 is first mounted on the frame 40 through two first bearings 9 and two third bearings 20, wherein the two first bearings 9 are located at two end positions, the two third bearings 20 are located at a position between the two first bearings 9, and the second main cam 25 and the first main cam 22 are mounted between the two third bearings 20.

For the right: the first bearing 9 and the second bearing 17 are limited by a second sleeve 16, the second bearing 17 and the third bearing 20 are limited by a third sleeve 19, and the third bearing 20 and the first main cam 22 are limited by a fourth sleeve 21.

For the left side: the second main cam 25 is limited by the fourth sleeve 21 with respect to the left third bearing 20, the third sleeve 19 is limited by the third bearing 20 with respect to the third bearing 17, and the third bearing 17 is limited by the second sleeve 16 with respect to the left first bearing 9.

As shown in fig. 3, the second main cam 25 and the first main cam 22 have the same profile and phase and are symmetrically arranged about the center line E-E, the second main cam 25 and the first main cam 22 are connected with the cam main shaft 28 through the flat key 29, the return cam 23 is connected with the cam main shaft 28 through the flat key 29, the second main cam 25 and the first main cam 22 are distributed on both sides of the return cam 23, the left end surface of the second main cam 25 and the right end surface of the first main cam 22 are distributed symmetrically through the fourth sleeve 21, the third bearing 20, the third sleeve 19, the second bearing 17, the second sleeve 16, the first bearing 9, the left end cover 27 and the right end cover 43, which are fixed on the frame 40, so as to limit the left and right movement of the main cam and the return cam. The second main cam 25 and the first main cam 22 are respectively in close contact with a first lower roller 30 and a second lower roller 31 which are symmetrically distributed about E-E, the return cam 23 is in close contact with an upper roller 24, the first lower roller 30 and the second lower roller 31 are mounted on a roller bracket 33, the roller bracket 33 is fixed on a middle support plate 41 of the punching slider 26 by a pin shaft 32, and the upper roller 24 is mounted on a top bracket 42 above the punching slider 26. The middle supporting plate 41 is provided with a plurality of pin shaft holes 34 with different heights, the roller bracket 33 is installed by selecting the pin shaft holes 34 with different heights, the height of the lower roller can be adjusted, conjugate cams with different sizes are synchronously replaced, and the stamping stroke of the stamping slide block 26 is changed. The second bearing 17 is installed in the anti-swing sliding block 18, the anti-swing sliding block 18 is symmetrically arranged along the central line E-E, the symmetrically arranged anti-swing sliding block 18 is in plane sliding fit with the inner parts of the left side and the right side of the stamping sliding block 26, and the upper roller, the lower roller, the base circle of the main return cam and the cam shaft 28 are ensured to be positioned on the same central line.

An upper working table plate 35 is installed at the bottom of the stamping slide block 26, the upper working table plate 35 is parallel to a lower working table plate 36, the lower working table plate 36 is fixed on four hydraulic cylinders 38, the four hydraulic cylinders 38 are fixed with the lower working table plate 36 through screws 37 and matching holes, and hydraulic oil drives the hydraulic cylinders 38 to move through oil passages 39. The purpose of the hydraulic cylinder 38 driving the lower work table plate 36 is to achieve the relative adjustability of the stroke of the slide 35, and at the same time, to have an overload protection function.

The stamping slide block 26 can realize long-time pressure maintaining at the bottom dead point, the pressure maintaining function is realized by the design of conjugate cam contour lines, taking the cycloid motion law as an example:

motion equation of the main cam and the return cam:

s₁＝h[(δ/δ₁)-sin(2πδ/δ₁)/(2π)] (0≤δ≤δ₁)

s₁₁＝h-h[(δ/δ₁)-sin(2πδ/δ₁)/(2π)] (π≤δ≤π+δ₁)

s₂＝h (δ₁≤δ≤δ₁+δ₂)

s₂₂＝0 (π+δ₁≤δ≤π+δ₁+δ₂)

s₃＝h[1-(δ/δ₃)+sin(2πδ/δ₃)/(2π)] (δ₁+δ₂≤δ≤δ₁+δ₂+δ₃)

s₃₃＝h-h[1-(δ/δ₃)+sin(2πδ/δ₃)/(2π)] (π+δ₁+δ₂≤δ≤π+δ₁+δ₂+δ₃)

in the formula, delta₁+δ₂+δ₃2 pi, the phase difference between the main cam and the return cam is 180 degrees, delta is the rotation angle of the main cam, h is the stroke of the stamping slide block, and s₁Is the push stroke motion curve of the main cam, s₁₁For the curve of the push stroke of the return cam, delta₁Is the total angle of rotation, s, of the main cam during its stroke movement₂Is the far rest (pressure maintaining of the slide block) motion curve of the main cam s₂₂For the back cam far rest (slider pressure maintaining) motion curve, δ₂Total angle of rotation, s, for main cam pressure maintaining₃Is the return motion curve of the main cam, s₃₃For the return-cam return-stroke motion curve, delta₃The total rotation angle of the main cam during the return motion.

The pressure maintaining time is as follows:

wherein, T₁The dwell time T when the stamping slide block is stamped downwards₀Is the stamping cycle of the stamping slide motion.

It should be noted that the servo motor of the power mechanism can be replaced by a common motor, and the servo motor stopping and pressure maintaining can be replaced by a mechanical high-precision pressure maintaining mode of normal rotation of the common motor, so that the special forming process requiring precise pressure maintaining of the bottom dead center is met, and particularly the hot stamping process requiring the plate to be always in close contact with the die and complete in-die quenching is realized.

The stamping slide block and the sliding pair on the rack are in gapless fit through the cylindrical roller, the cylindrical roller is arranged on the stamping slide block, the guide rail is arranged on the rack (not shown in the figure), and the roller and the guide rail are in interference fit, so that unbalance loading is inhibited, and the movement precision of the sliding pair is improved.

And the frames on the two sides of the camshaft are respectively provided with a balance cylinder 43 connected with the stamping slide block. The stamping slider is heavy when at rest, which causes the transmission system such as the cam and the driving system motor to bear load, and the balance cylinder 43 is used for balancing the weight; when the stamping slide block moves upwards, in order to reduce the speed, the impact is reduced to carry out speed reduction balance; the punching slide block can be used for avoiding accidents, such as loosening of a connecting rod bolt and balance loss of the supporting force, and the effect of timely buffering and protecting workers is achieved.

Example two: fig. 6 shows the contour lines and relative positions of the linear conjugate cam and the roller, which were determined under the conditions that the radius of the base circle of the cam was 40mm, the stroke was 10mm (i.e., the plunger), the radius of the roller was 10mm, and the amount of eccentricity of the roller was 0. FIG. 6 is a conjugate cam profile diagram showing a cam with a base radius of 40mm, different throw, an eccentricity of 0, and a roller radius of 10 mm.

Example three: a three-dimensional view of the conjugate cam and roller as shown in fig. 8, where the main return cam base radius: 40mm, 30mm of push rod displacement, 10mm of roller radius, 120 degrees of slide block downward stroke (1/3 cycles), 170 degrees of pressure maintaining (about 1/2 cycles), 70 degrees of return stroke (about 1/6 cycles); under above condition, the design obtains the kinematics curve of slider under the motion law of difference and the contrast of the crank connecting rod press displacement curve that the tradition can't realize the pressurize, and in this example promptly, the dwell time is:

and in the pressure maintaining time, the displacement of the sliding block is 0, so that the requirement of the stamping process for maintaining the pressure at the bottom dead center is met.

The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.