CN112547959A

CN112547959A - Mechanical hysteresis ejection device

Info

Publication number: CN112547959A
Application number: CN202011302912.6A
Authority: CN
Inventors: 马梨哲; 李康; 罗洪松; 陈毅; 茹承曦; 王韦; 余冬晴; 吴娟; 朱汉强; 陈亚鑫
Original assignee: Dongfeng Wuhan Industrial Co ltd
Current assignee: Dongfeng Wuhan Industrial Co ltd
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-03-26
Anticipated expiration: 2040-11-19
Also published as: CN112547959B

Abstract

The invention discloses a mechanical lag ejection device, wherein a stamping workpiece is positioned between an upper die pressing material core and a lower die blank holder, is stamped and ejected, and the mechanical lag ejection device comprises: the rotary support assembly is arranged on the side face of the lower die blank holder body and comprises a profiling support block mounting seat, a profiling rotary support block, a first rotating shaft, a top pin spring, a top pin fixing pressure plate and a lower strength support block; the side driving assembly is arranged on the lower die holder body and comprises a driving block mounting seat, a nitrogen spring, a sliding plate, a second rotating shaft, a roller, a driving block positioning key, a sliding plate cover plate and a protection plate; go up intensity supporting shoe and adjustment cushion. The invention has the function of preventing the stamping workpiece from being pressed and deformed by mechanical hysteresis movement, effectively solves the problem that the stamping workpiece is easily pressed and deformed by a blank holder (ejector), and has the characteristics of simplicity, convenience, low manufacturing cost, reasonable and scientific use and strong universality.

Description

Mechanical hysteresis ejection device

Technical Field

The invention relates to the technical field of automobile stamping dies. More particularly, the present invention relates to a mechanical hysteresis ejection device.

Background

In the deep material pressing and forming production process of metal sheet parts, generally, due to the requirements of product technology and appearance quality, a mold is designed into a complex double-active material pressing and forming structure so as to better meet the requirements of material pressing, crease resistance and ejection function of the mold. Meanwhile, the production unit is to improve the production efficiency of the finished piece, ensure stable production quality, shorten the installation time of the punching die and the like, and the upper die pressing material core and the lower die pressing edge ring (ejector) are required to provide pressing and ejecting force by adopting a standard nitrogen spring arrangement mode. However, most of the existing mold nitrogen spring forces are always in a non-linear gradual change state along with the change of a compression stroke, so that in the actual production process of a thin plate workpiece, the forming mold of the double-movable structure completely using the nitrogen spring is easy to cause the workpiece to be pressed and deformed by a lower mold blank holder (ejector) (the upward movement speed of the material pressing core, the workpiece and the blank holder is changed from slow to fast in the return process of a press sliding block, an upper mold concave die firstly leaves the upper surface of the workpiece, and the pressing force of the lower mold blank holder on the workpiece cannot be balanced by other parts), so that the workpiece is deformed and scrapped and cannot be normally produced. In addition, the existing time-delay nitrogen spring is also limited by factors such as high cost, mold cavity space range, complex electrical circuit arrangement, weak safety, short service life, complex maintenance and debugging and the like, and cannot be widely accepted and used by the mold market. In order to solve the problem, the workpiece can be smoothly and stably separated from the die cavity after being jacked up, and the workpiece is not jacked and deformed.

Disclosure of Invention

The invention aims to provide a mechanical hysteresis ejection device, which has the function of preventing a stamped part from being jacked and deformed by mechanical hysteresis motion, effectively solves the problem that the stamped part is easily jacked and deformed by a blank holder (ejector), and has the characteristics of simplicity, convenience, low manufacturing cost, reasonable and scientific use and strong universality.

To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a mechanical hysteresis ejection apparatus for performing press forming and ejecting of a press-formed article between an upper die core and a lower die binder, the mechanical hysteresis ejection apparatus comprising:

the rotary support assembly is arranged on the side face of the lower die blank holder body and comprises a profiling support block mounting seat, a profiling rotary support block, a first rotating shaft, a top pin and a top pin spring, the profiling support block mounting seat is fixed on the side face of the lower die blank holder body, a notch is formed in the side face of the profiling support block mounting seat, the first rotating shaft is arranged in the notch, the profiling rotary support block is of a U-shaped structure and is vertically arranged in the side direction, the side end below the profiling rotary support block is sleeved on the first rotating shaft and is arranged to rotate in the notch, a bulge is arranged on the outer side face of the upper portion of the profiling rotary support block, the profiling rotary support block rotates around the first rotating shaft through lateral stress to change the action point of the top pin, the inner bottom face of the U-shaped of the profiling rotary support block tightly abuts against one end of the horizontal top pin, and the other large end face of, the other end of the ejector pin spring is fixedly and tightly abutted in a spring hole in the side face of the lower die blank holder body and is used for providing lateral rotation reset power for the profiling rotation supporting block;

side drive assembly, it is installed on lower die holder body, side drive assembly includes drive block mount pad, nitrogen spring, slide, second rotation axis and running roller, recess passageway is located in the drive block mount pad, the slide is the type of falling L, and its horizontal plate is located drive block mount pad upper surface covers just recess passageway top, nitrogen spring one end is tightly supported recess passageway face, and its other end tightly supports the vertical board of slide for provide gliding power for the slide, the second rotation axis assemble in the slide tip of buckling, the running roller cover is located on the second spiral shaft and with the rotatory supporting shoe of profile modeling produces the revolute pair.

Preferably, the upper die pressing core is provided with an upper strength support block at a position contacting the rotary support assembly, the rotary support assembly further comprises a lower strength support block fixed on the upper surface of the lower die blank holder body, and the lower strength support block is located right below the side end above the profiling rotary support block and is used for generating a jacking force action balance point when contacting the upper strength support block of the upper die pressing core.

Preferably, an adjusting cushion block is fixedly arranged on the upper die material core in contact with the rotary support component, the upper strength support block is fixed on the adjusting cushion block, and the thickness of the adjusting cushion block is adjustable.

Preferably, the rotary support assembly further comprises a top pin fixing pressing plate, the top pin fixing pressing plate is fixed to the side face of the lower die blank holder body, and the top pin fixing pressing plate is sleeved on the outer side of the top pin and used for guiding and limiting the top pin.

Preferably, the lateral driving assembly further comprises a driving block positioning key for accurately positioning the driving block mounting seat and balancing the lateral force applied to the driving block mounting seat, the lower part of the driving block positioning key is fixedly embedded in the lower die holder body, the upper part of the driving block positioning key is fixedly embedded in the driving block mounting seat, and the driving block mounting seat is fixed in the lower die holder body through the driving block positioning key and a bolt.

Preferably, the lateral driving assembly further comprises a sliding plate cover plate fastened to the upper surface of the driving block mounting seat and located on the upper surface of the sliding plate through bolts for limiting the Z-directional displacement of the sliding plate.

Preferably, the lateral driving assembly further comprises a protection plate which is also positioned on the surface of the driving block mounting seat to seal the driving block mounting seat and prevent the nitrogen spring from being damaged and flying out to hurt people and prevent foreign matters from entering the ejection device.

Preferably, both ends of the first rotating shaft and the second rotating shaft are provided with screw plugs for locking and limiting the first rotating shaft and the second rotating shaft so as to prevent the first rotating shaft and the second rotating shaft from falling.

Preferably, the adjusting cushion block is composed of a plurality of thin gaskets and a cushion block body.

Preferably, the adjusting pad block includes:

the cushion block base body is a square solid fixed block, the peripheries of three side surfaces of the upper surface of the cushion block base body are all downwards sunken to form a lateral U-shaped concave channel, the front side surface of the cushion block base body, which is not provided with the concave channel, is provided with a plurality of clamping grooves which are horizontally inwards sunken and are arranged at intervals along the height direction of the cushion block base body, and the upper reinforcing supporting block is fixed on the lower bottom surface of the cushion block base body;

the adjusting shell is of a hollow square structure with an opening on the lower bottom surface and one side surface, the upper top surface of the adjusting shell is fixed on the upper die pressing material core, one side surface of the opening of the adjusting shell corresponds to the front side surface of the cushion block base body without the concave channel, the adjusting shell is vertically and tightly matched in the U-shaped concave channel from top to bottom, the upper top surface of the adjusting shell and the upper top surface of the cushion block base body are sequentially stacked up and down through a plurality of standard cushion blocks to form tight filling, any standard cushion block is arranged to be capable of being just clamped in the clamping groove, a plurality of threaded holes are formed in the rear side surface of the adjusting shell at intervals in the vertical direction and the horizontal direction, and the threaded holes in the horizontal direction are positioned on one side of the central line of the;

the fixing mechanism comprises a fixing plate and a pair of fixing belts, the fixing plate is hinged to the top of the front side face of the cushion block base body, the front side face of the cushion block base body is not provided with a concave channel, the length of the fixing plate is equal to that of the adjusting shell, one end of each fixing belt is fixed to the two sides of the fixing plate, the other end of each fixing belt is located on the rear side of the adjusting shell after being wound on the two sides of the adjusting shell, a plurality of circular through holes matched with the rear side face of the adjusting shell are formed in the other end of each fixing belt along the length direction of the fixing belt, a clamping ring is arranged at the other end of one fixing belt, and the other end of the other fixing belt penetrates through the clamping ring to enable the pair of fixing belts to be.

The invention at least comprises the following beneficial effects:

in the process that an automobile sheet stamping workpiece is ejected by returned materials after being pressed and formed, the action position of ejection force in the movement process is changed by using a corresponding mechanical hysteresis ejection device, and overlarge ejection force is balanced, specifically, the ejection force of a lower die pressing edge ring acts on a material pressing core through a side supporting block during initial ejection, the workpiece is in the middle balance position of the blank holder ring, the workpiece and the material pressing core, the blank holder ring supporting block laterally rotates and loses the supporting effect along with the rising movement of the blank holder ring, at the moment, the upper die pressing material core is separated from the upper surface of the workpiece, the rising speed of the blank holder ring gradually becomes slow, the ejection action force of the upper die pressing material core gradually becomes weak, so that the problems that the sheet metal workpiece is scrapped due to ejection deformation by the blank holder ring (ejector) in the production process, the demolding is difficult, the production efficiency is low and the like are solved, the ejection device is very suitable for ejection design, assembly and manufacture of the automobile thin plate deep material pressing forming die.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic perspective view of the device of the present invention in a closed position;

FIG. 2 is a schematic view of the construction of the rotary support assembly of the binder ring (ejector) of the present invention;

FIG. 3 is a schematic side view of the rotary support assembly of the present invention;

FIG. 4 is a schematic view of a lower strength support block of the upper mold core of the present invention;

FIG. 5 is a schematic view of a front view of the adjusting pad of the present invention;

FIG. 6 is a schematic rear view of the adjusting pad of the present invention.

Description of reference numerals:

1. the device comprises a lower die blank holder, a profiling supporting block mounting seat, a profiling rotating supporting block, a first rotating shaft, a second rotating shaft, a notch, a top pin, a boss, a top pin fixing pressing plate, a lower strength supporting block, a lower boss, a driving block positioning key, a driving block mounting seat, a nitrogen spring, a sliding plate cover plate, a second rotating shaft, a groove channel, a roller, a protecting plate, a roller, a protecting plate, an upper die pressing material core, a clamping groove, a groove channel, an adjusting shell, a regulating cushion block, a standard cushion block, a fixing plate.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In fig. 1 to 4, in order to clearly show the structures and the positional relationships of the respective components, a partial structure is processed by partial cutting, and a complete component is not shown, so that the comprehension of the completeness and the clarity of the structure of the present application is not affected.

As shown in fig. 1 to 4, the present invention provides a mechanical hysteresis liftout apparatus, in which a punched article is positioned between an upper mold core 20 and a lower mold blank holder 1 to be punched and lifted, the mechanical hysteresis liftout apparatus comprising:

the rotary support assembly is arranged on the side surface of the body of the lower die blank holder 1 and comprises a profiling support block mounting seat 2, a profiling rotary support block 3, a first rotating shaft 4, a top pin 6, a top pin spring and a top pin fixing pressing plate 8, the profiling support block mounting seat 2 is fixed on the side surface of the body of the lower die blank holder 1, a notch 5 is formed in the side surface of the profiling support block mounting seat 2, the first rotating shaft 4 is arranged in the notch 5, the profiling rotary support block 3 is of a U-shaped structure and is vertically arranged in the side direction, the side end below the profiling rotary support block 3 is sleeved on the first rotating shaft 4 and is arranged to rotate in the notch 5 without rotating interference, a bulge 7 is arranged on the outer side surface of the upper part of the profiling rotary support block 3, and the profiling rotary support block 3 rotates around the first rotating shaft 4 to change the, the U-shaped inner bottom surface of the profiling rotating supporting block 3 tightly supports one end of a horizontal jacking pin 6, the other large end surface of the jacking pin 6 horizontally and tightly supports one end of a jacking pin spring, the other end of the jacking pin spring is fixed and tightly supported in a spring hole in the side surface of a lower die blank holder 1 body and used for providing lateral rotating reset power for the profiling rotating supporting block 3, a jacking pin fixing pressing plate 8 is fixed on the side surface of the lower die blank holder 1 body, and the jacking pin fixing pressing plate 8 is sleeved on the outer side of the jacking pin 6 and used for guiding and limiting the jacking pin 6

The side driving assembly is arranged on the lower die holder 10 body and comprises a driving block mounting seat 12, a nitrogen spring 13, a sliding plate 14, a second rotating shaft 16, a roller 18, a driving block positioning key 11, a sliding plate cover plate 15 and a protection plate 19, wherein a groove channel 17 is formed in the driving block mounting seat 12, the sliding plate 14 is of an inverted L shape, a horizontal plate of the sliding plate is positioned on the upper surface of the driving block mounting seat 12 and just covers the upper part of the groove channel 17, one end of the nitrogen spring 13 is tightly abutted against the surface of the groove channel 17, the other end of the nitrogen spring is tightly abutted against a vertical plate of the sliding plate 14 and used for providing sliding power for the sliding plate 14, the second rotating shaft 16 is assembled in the bent end part of the sliding plate 14, the roller 18 is sleeved on the second rotating shaft and generates a rotating pair with the profiling rotating support block 3, and the roller 18 sleeved on the second rotating shaft interacts with the bulge 7 of the profiling rotating support block 3, the driving block positioning key 11 is used for accurately positioning the driving block mounting seat 12 and balancing lateral force applied to the driving block mounting seat 12, the lower portion of the driving block positioning key 11 is fixedly embedded in the lower die holder 10 body, the upper portion of the driving block positioning key is fixedly embedded in the driving block mounting seat 12, the driving block mounting seat 12 is fixed in the lower die holder 10 body through the driving block positioning key 11 and bolts, the sliding plate cover plate 15 is fastened to the upper surface of the driving block mounting seat 12 through bolts and located on the upper surface of the sliding plate 14 and used for limiting the displacement of the sliding plate 14 in the Z direction, the protection plate 19 is also located on the surface of the driving block mounting seat 12 to seal the driving block mounting seat 12, and the nitrogen spring 13 is prevented from being damaged and flying out to hurt people and foreign matters are prevented from entering the.

The two ends of the first rotating shaft 4 and the second rotating shaft 16 are both provided with screw plugs for locking and limiting the first rotating shaft 4 and the second rotating shaft 16 so as to prevent the first rotating shaft 4 and the second rotating shaft 16 from falling.

In the technical scheme, as shown in fig. 2, a profiling support block mounting seat 2 is fixed on the side surface of a lower die blank holder 1 (ejector) body, a first rotating shaft 4 is arranged in a groove in the middle of the profiling support block mounting seat 2, namely a notch 5, a profiling rotating support block 3 is arranged on the first rotating shaft 4, a side ejector pin 6 is limited by an ejector pin fixing pressure plate 8, an ejector pin spring is arranged in the side ejector pin spring to provide power, and a lower strength support block 9 is arranged at the upper part of the side surface of the lower die blank holder 1 body. When the mould is closed, the profiling rotating support block 3 is forced to rotate to the vertical direction, and the ejecting force is transmitted through the profiling rotating support block 3 and acts on the strength support block 21 on the upper mould pressing material core 20. And the profiling rotating supporting block 3 is ejected out, rotated and reset by the ejector pin 6 at the back side after the mould is opened.

As shown in fig. 3, the roller 18 and the second rotating shaft 16 are mounted on the sliding plate 14, and are powered by the side nitrogen spring 13, and the surface of the roller 18 acts on the profiling surface of the profiling rotating support block 3. In the downward closing stage of the mold, the side driving assembly applies force to the profiling rotating support block 3 to enable the profiling rotating support block to rotate to the vertical direction. The side driving component provides reset power for the profiling rotating supporting block 3, and the strength supporting block 21 on the upper die pressing core 20 and the profiling rotating supporting block 3 are contacted and stressed to move together in an interaction manner, so that the pressing area of a workpiece is protected to be slowly jacked up after lagging and not deformed.

In another technical solution, as shown in fig. 2 and 4, an upper strength support block 21 is disposed at a position on the upper die pressing core 20 contacting the rotation support assembly, the rotation support assembly further includes a lower strength support block 9 fixed on an upper surface of the lower die blank holder 1 body, and the lower strength support block 9 is located right below a side end above the profiling rotation support block 3 and is configured to generate a balance point of an ejection force action when contacting the upper strength support block 21 on the upper die pressing core 20. An adjusting cushion block 22 is fixedly arranged on the upper die material core 20, which is in contact with the rotary supporting component, the upper strength supporting block 21 is fixed on the adjusting cushion block 22, and the thickness of the adjusting cushion block 22 is adjustable.

In the above technical scheme, the strength supporting block 21 on the upper die pressing core 20 is fixedly installed on the adjusting cushion block 22, and the upper strength supporting block 21 always balances the acting force of the blank holder in the processes of die closing and die opening (the pressing core is not separated from the upper surface of the workpiece). In addition, when the finished piece cracks or wrinkles in the production process and the blank holder force needs to be adjusted, the gap between the material pressing surfaces can be controlled by reducing or increasing the thickness of the material pressing core adjusting cushion block 22.

In another technical scheme, the adjusting cushion block 22 is composed of a plurality of shims and a cushion block body, the cushion block body has a basic thickness, the plurality of shims are in an adjustable thickness range of the adjusting cushion block 22, the number of the shims is increased or decreased according to the adjustment requirement, then the cushion block body and the plurality of shims are fixed into a whole and then fixed on the upper mold material core 20, and then the upper strength support block 21 is fixed.

In another embodiment, as shown in fig. 5 and 6, the adjusting pad 22 includes:

the cushion block base body 23 is a square solid fixing block, the peripheries of three side surfaces of the upper surface of the cushion block base body 23 are all recessed downwards to form a lateral U-shaped concave channel 24, the front side surface of the cushion block base body 23, which is not provided with the concave channel 24, is provided with a plurality of clamping grooves 25 which are horizontally recessed inwards and are arranged at intervals along the height direction of the cushion block base body 23, and the upper reinforcing supporting blocks 21 are fixed on the lower bottom surface of the cushion block base body 23;

the adjusting shell 26 is a hollow square structure with an opening on the lower bottom surface and one side surface, the upper top surface of the adjusting shell 26 is fixed on the upper die pressing core 20, the open side surface of the adjusting shell 26 corresponds to the front side surface of the cushion block base body 23 without the concave channel 24, the adjusting shell is vertically and tightly matched in the U-shaped concave channel 24 from top to bottom, the upper top surface of the adjusting shell 26 and the upper top surface of the cushion block base body 23 are sequentially stacked up and down through a plurality of standard cushion blocks 27 to form tight filling, any standard cushion block 27 is arranged to be capable of being tightly clamped in the clamping groove 25, the rear side surface of the adjusting shell 26 is provided with a plurality of threaded holes 30 at intervals in the vertical direction and the horizontal direction, and the threaded hole 30 in the horizontal direction is positioned on one side of the central line of the rear side surface of the adjusting shell 26;

the fixing mechanism comprises a fixing plate 28 and a pair of fixing belts 29, the fixing plate 28 is hinged on the top of the front side surface of the cushion block base body 23 without the concave channel 24, the length of the fixing plate 28 is equal to the length of the adjusting shell 26, one end of a pair of fixing straps 29 is fixed on both sides of the fixing plate 28, the other end of the pair of fixing straps 29 is positioned on the rear side of the adjusting shell after being wound on both sides of the adjusting shell 26, the other end of the pair of fixing straps 29 is provided with a plurality of round through holes matched with the rear side surface of the adjusting shell 26 along the length direction, the other end of one of the fixing straps 29 is provided with a snap ring 31, and the other end of the other fixing strap 29 passes through the snap ring 31 so that at least one pair of circular through holes of the pair of fixing straps 29 corresponds to at least one threaded hole 30 on the rear side of the adjusting shell 26 and is fixed by bolts.

In the above technical solution, the general adjusting cushion block 22 increases or decreases the number of shims as required to adjust the actual thickness of the cushion block, and this method only needs to adjust the thickness of the shim each time before fixing the adjusting cushion block 22 and the upper strength support block 21 thereon, which is inconvenient and inefficient in the actual operation process. This technical scheme is through the structure of reasonable setting adjustment cushion 22, does not need fixed adjustment cushion 22 again after the adjustment gasket thickness and last intensity supporting shoe 21 on it, initial condition has fixed adjustment cushion 22 and last intensity supporting shoe 21 on it, adjust the thickness as required can, realize the thickness of convenient and fast adjustment cushion.

The number of the standard cushion blocks 27 between the adjusting shell 26 and the cushion block base 23 is set according to the requirement, the redundant standard cushion blocks 27 can be inserted into the clamping grooves 25 of the cushion block base 23, when the adjusting shell 26 and the cushion block base 23 are required to be used, the adjusting shell 26 is placed between the adjusting shell 26 and the cushion block base 23 after being taken out, the adjusting shell 26 realizes the adjustment of the space between the adjusting shell 26 and the cushion block base 23 through the concave channel 24, then the thickness adjustment is realized by tightly filling the standard cushion blocks 27, the standard cushion blocks 27 are thin cushion blocks, the adjustment of various thicknesses is completely met, the adjusting shell 26 is tightly matched with the concave channel 24 to increase the connection tightness between the adjusting shell 26 and the cushion block base 23, the clamping grooves 25 are used for placing the temporarily unnecessary standard cushion blocks 27, on one hand, the storage and adjustment are convenient, on the other hand, the strength of the cushion, the strength of the cushion block base body 23 can meet the actual requirement, and in addition, when the standard cushion block 27 of the clamping groove 25 cannot meet the adjustment requirement of the actual thickness, the standard cushion block 27 processed on site can be used for supplement. Since the standard cushion block 27 is tightly compacted between the adjustment housing 26 and the cushion block base 23, the screw hole 30 provided on the rear side surface of the adjustment housing 26 can facilitate the auxiliary ejection of the standard cushion block 27 by the ejector pin passing through the screw hole 30.

After the thickness of the adjusting shell 26 and the pad base 23 is adjusted, the tight fit between the concave channel 24 and the adjusting shell 26 cannot ensure the tightness of the connection between the two, so a fixing mechanism is provided. Fixed plate 28 articulates on cushion base member 23, when carrying out thickness adjustment, fixed plate 28 rotates for keeping away from the space between adjustment shell 26 and the cushion base member 23, do not interfere the increase and decrease of standard cushion 27, after the adjustment is accomplished, rotate fixed plate 28 for the space between vertical orientation adjustment shell 26 and the cushion base member 23, again with a pair of fixed band 29 from adjustment shell 26 both sides around establishing to the rear side, fixed band 29 is soft rubber material, certain elasticity has, one of them fixed band 29 passes from the snap ring 31 of another fixed band 29, then pass through the bolt with a pair of fixed band 29 be fixed in screw hole 30, realize the fixed connection of adjustment shell 26 and cushion base member 23, fixed bolt length is shorter, its end hugs closely fixed band 29 and sets up after the bolt fastening. In the process of adjusting the housing 26 to enter or exit the concave channel 24, the bottom row of threaded holes 30 may not be exactly horizontally located on the horizontal plane of the fixing band 29, and the fixing band 29 is made of a soft material and can be tilted as required to ensure that the circular through holes on the fixing band 29 can be matched with the threaded holes 30. The size of the circular through hole matches the size of the threaded hole 30.

As shown in fig. 1, when the blank holder is initially ejected, the ejection force of the lower die holder 1 acts on the upper strength support block 21 of the upper die pressing core 20 through the lower strength support block 9 on the side surface of the body of the lower die holder 1, at the moment, the ejection force applied to the workpiece is the largest, the workpiece is located at a force balance position between the upper strength support block and the lower strength support block, and the blank holder and the pressing core cannot generate torque action on the whole workpiece. Along with the ascending motion of the blank holder, the finished piece and the material pressing core, the blank holder profiling rotating supporting block 3 rotates laterally to lose the supporting effect, at the moment, the upper die material pressing core 20 leaves the upper surface of the finished piece, the ascending speed of the blank holder motion gradually becomes slow, the ejection acting force of the blank holder motion gradually becomes weak, and therefore the finished piece cannot be ejected and deformed.

The principle of the mechanical lag ejection device is divided into three stages:

firstly, the mold is in the down-forming closing stage

Before closing, the ejector pin 6 pushes the profiling rotating supporting block 3 to be in a lateral leftward inclined state through the resilience of the ejector pin spring, when the roller 18 of the sliding plate 14 of the side driving assembly is not in contact with the profiling supporting block, the sliding plate 14 is in a maximum telescopic state because the nitrogen spring 13 in the sliding plate is not compressed, the upper die continues to descend, when the roller 18 is in contact with the profiling rotating supporting block 3 and is stressed to the forming closing process, the nitrogen spring 13 is in a compressed state, the sliding plate 14 moves leftwards all the time, and the sliding plate 14 is gradually changed from the maximum extension amount to the minimum extension amount. The side driving component acts on the profiling rotating support block 3, and when the mould is closed to the bottom, the profiling rotating support block 3 is just in the vertical direction of 90 degrees, namely the state shown in figure 1.

During closing, the nitrogen spring 13 pushes the sliding plate 14 to move rightwards, and the roller 18 at the end of the sliding plate 14 provides a force in the right horizontal direction to the bulge 7 of the profiling rotating support block 3, so that the profiling rotating support block gradually rotates from an inclined state to a vertical state. Meanwhile, the top of the profiling rotating supporting block 3 is just contacted with the upper strength supporting block 21 on the upper die pressing core 20 to bear force.

Secondly, the mould is in the stage that the upward mould opening pressing surface is not separated from the upper surface of the workpiece

The upper die concave die surface leaves the upper surface of the workpiece firstly, the upper die pressing core 20 is still pressed in the middle area of the workpiece, and the jacking acting force of the blank holder is transmitted to the upper die pressing core 20 through the profiling rotating support block 3, so that the three objects of the blank holder, the workpiece and the pressing core are in an integral ascending motion state, and the workpiece cannot be deformed.

Third, the stage that the material pressing core of the mold leaves the upper surface of the workpiece

At the moment, the ejector pin 6 pushes the profiling rotating support block 3 away to rotate and reset to an initial inclined state, and the ejection force of the blank holder applied to the workpiece approaches to 0, so that the workpiece is not deformed. In addition, if the product is wrinkled or cracked in the whole forming process, the quality defect can be eliminated by adjusting the thickness of the adjusting cushion block 22 on the upper die material core 20.

The assembly process of the device of the invention is as follows:

after the parts profiling support block mounting seat 2, the profiling rotating support block 3, the first rotating shaft 4 screw plug, the ejector pin 6, the ejector pin spring, the ejector pin fixing pressure plate 8 and the lower strength support block 9 are assembled as shown in fig. 2, the sub-part rotating support assembly is mounted and fixed on the side wall of the lower die blank holder 1 (ejector) body, and rotation interference needs to be noticed.

After the part driving block positioning key 11, the driving block mounting seat 12, the nitrogen spring 13, the sliding plate 14, the sliding plate cover plate 15, the second rotating shaft 16, the screw plug and the roller 18 are assembled as shown in fig. 3, the part side driving assembly is fixedly installed on the side wall of the lower die holder 10 body, and the part protection plate 19 is separately fixed on the upper portion of the side wall of the lower die holder 10 body.

After the strength supporting block 21 and the adjusting cushion block 22 on the component are assembled as shown in fig. 4, the component is mounted and fixed on the upper die material core 20 body, it should be noted that the thickness of the adjusting cushion block 22 is reduced to the cushion block body by lowering the tool of the adjusting cushion block 22 of the material core, the adjusting range of the cushion block is increased by supplementing the thickness with a plurality of thin cushion pieces, and the closing distance of the die is controlled by withdrawing or adding the thin cushion pieces, so as to facilitate the on-site debugging.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. The utility model provides a machinery lags ejecting device, the punching press finished piece is located punch forming between upper die material core and the lower mould blank holder and is ejecting, its characterized in that, machinery lags ejecting device includes:

2. The mechanical hysteresis liftout attachment of claim 1, wherein the upper die core is provided with an upper strength support block at a portion contacting the rotary support assembly, and the rotary support assembly further comprises a lower strength support block fixed to the upper surface of the lower die blank holder body, the lower strength support block being located directly below the side end above the profiling rotary support block for generating a balance point of the lifting force when contacting the upper strength support block of the upper die core.

3. The mechanical hysteresis ejection device of claim 2, wherein the upper die core is fixedly provided with an adjusting pad at a portion contacting the rotary support member, the upper strength support block is fixed to the adjusting pad, and the adjusting pad is configured to be adjustable in thickness.

4. The mechanical hysteresis ejection device of claim 1, wherein the rotary support assembly further comprises an ejector pin fixing pressing plate fixed to a side surface of the lower die blank holder body, and the ejector pin fixing pressing plate is sleeved outside the ejector pin for guiding and limiting the ejector pin.

5. The mechanical lag ejection device of claim 1, wherein the lateral drive assembly further comprises a drive block positioning key for accurately positioning a drive block mounting seat to balance lateral forces applied thereto, the drive block positioning key being embedded in the lower die holder body at a lower portion thereof and embedded in the drive block mounting seat at an upper portion thereof, the drive block mounting seat being fixed in the lower die holder body by the drive block positioning key and a bolt.

6. The mechanical hysteresis ejection device of claim 1 wherein the lateral drive assembly further comprises a sled cover plate bolted to the drive block mount upper surface and located on the sled upper surface for limiting Z-displacement of the sled.

7. The mechanical hysteresis ejection device of claim 6, wherein the lateral drive assembly further comprises a shield plate also located on the drive block mount surface to enclose the drive block mount and prevent nitrogen spring damage from flying out and injuring a person and foreign objects from entering the ejection device.

8. The mechanical hysteresis ejection device as claimed in claim 1, wherein the first rotating shaft and the second rotating shaft are provided at both ends thereof with screw plugs for locking and limiting the first rotating shaft and the second rotating shaft to prevent them from falling.

9. The mechanical hysteresis ejection device of claim 3 wherein said adjustable pad is comprised of a plurality of shims and a pad body.

10. The mechanical hysteresis ejection device of claim 3 wherein said adjustment pad comprises: