CN111283088A - Stretching and squeezing integrated die and machining tool thereof - Google Patents

Abstract

The invention relates to the technical field of automobile cold stamping dies, in particular to a stretching and extruding integrated die and a processing tool thereof, wherein the die comprises an upper die and a lower die; the upper die comprises a stretching female die; the lower die comprises a stretching male die and a lower extrusion block arranged around the periphery of the stretching male die; when the plate is contacted with the lower extruding and breaking block in the descending process, the plate can be extruded and broken by the lower port of the concave cavity of the stretching female die and the lower extruding and breaking block. The invention can integrally realize the stretching and the extrusion breaking of the plate without trimming and flanging processes, can realize the processes of the traditional three-way die by one set of die, has low material cost and simple assembling and debugging procedures, reduces the working hours, manpower and processing and debugging equipment for assembling and debugging the die, simultaneously reduces the storage space and later-period transportation cost of the die, produces stamping parts in the later period, saves the cost of manpower, equipment, time and the like, simultaneously improves the production efficiency, has strong applicability, and can be applied to box-shaped parts such as general oil tank end covers and the like.

Description

Stretching and squeezing integrated die and machining tool thereof

Technical Field

The invention relates to the technical field of automobile cold stamping dies, in particular to a stretching and extruding integrated die and a processing tool thereof.

Background

The existing processing of the automobile oil tank end cover generally needs the processing processes of stretching, trimming, flanging and shaping, closing up and the like, and also needs special stretching dies, trimming dies, flanging dies and other dies and equipment, and also needs to be processed, assembled and debugged respectively. After the dies are finished, the dies are respectively installed on a press machine, and are produced through at least four processes of stretching, trimming, flanging, closing up and the like in a cold stamping mode.

The above prior art has the following disadvantages:

(1) three processes of stretching, trimming and flanging need three sets of dies, and the required material is more, so that the material cost is high;

(2) the number of parts is large, each set of die needs to be assembled and debugged independently, and more processing working hours, more manpower and processing debugging equipment are needed in the later production process;

(3) the number of adopted moulds is more, more storage space is needed, and the later transportation cost is higher;

(4) when the oil tank end covers are produced in batches at the later stage, because the number of dies is large, higher labor cost and higher equipment cost are needed to meet production requirements, and the number of production steps is large, the consumed time is long, and the production efficiency is low.

Disclosure of Invention

The invention aims to provide a stretching and extruding integrated die device and a processing tool thereof, so as to solve the technical problems in the prior art.

In order to solve the technical problem, the stretching and extruding integrated die provided by the invention comprises an upper die and a lower die; the upper die comprises a stretching female die; the lower die comprises a stretching male die and a lower extrusion block arranged around the periphery of the stretching male die; when the plate is contacted with the lower extrusion breaking block in the descending process, the plate can be extruded and broken by the lower port of the concave cavity of the stretching female die and the lower extrusion breaking block.

Further, the lower extrusion block and the lower port of the concave cavity have a horizontal distance in the horizontal direction, and the horizontal distance is smaller than the thickness of the plate.

Further, the horizontal spacing is zero.

Further, the lower die comprises a lower die seat; the top of the lower extrusion block is positioned below the bottom surface of the stretching male die, the bottom of the lower extrusion block is fixed with the lower die holder, and the outer edge of the lower extrusion block protrudes out of the side surface of the stretching male die.

Further, the cross section of the lower extrusion block is square.

Further, the upper die comprises an upper die base; the stretching female die comprises a stretching insert surrounding the outer periphery of the concave cavity; the stretching insert forms the lower port of the concave cavity and is fixed on the upper die holder; when the sheet material contacts with the lower extrusion breaking block in the descending process, the sheet material can be extruded and broken by the stretching insert and the lower extrusion breaking block.

Further, the upper die base is provided with an annular mounting groove for accommodating the stretching insert.

Further, the device also comprises a blank holder; the blank holder is used for being placed on a telescopic mechanism of a machine tool, and the telescopic mechanism is used for jacking the blank holder and enabling the blank holder to move downwards under the pressure of an upper die.

Further, the blank holder includes the circle body and install on the circle body and be annular blank holder insert.

Further, the invention also provides a processing tool, which comprises a closing-in die and the stretching and extruding integrated die;

the closing-up die comprises an upper die, a lower die and an upper driving part;

the upper die comprises an upper die base and a closing mechanism movably connected to the upper die base;

the closing mechanism is annular, and the annular shape can stretch out and draw back;

the lower die is used for placing an end cover;

the upper driving part is used for driving the closing mechanism to contract so as to extrude, close and mold the periphery of the end cover in the annular inner part of the closing mechanism.

By adopting the technical scheme, the invention has the following beneficial effects:

the die provided by the invention can integrally realize the stretching and extrusion breaking of the plate without trimming and flanging, one set of die can realize the traditional three-step die process, the required material is less, the material cost is low, the assembly and debugging procedures of one set of die are simple, the working time, labor and processing and debugging equipment for assembling and debugging the die are reduced, the storage space and later-stage transportation cost of the die are reduced, the integral forming and later-stage production of stamping parts are realized, the labor, equipment, time and other costs are saved, the production efficiency is improved, the applicability is strong, and box-shaped parts such as general oil tank end covers and the like can be suitable for the die.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a cross-sectional view of a stretch-break integrated die provided in accordance with an embodiment of the present invention;

FIG. 2 is a partial component view of an upper die of the stretch-break unitary die shown in FIG. 1;

FIG. 3 is a schematic structural view of a lower mold of the stretch-break integrated mold shown in FIG. 1;

FIG. 4 is a schematic structural view of a blank holder ring in the stretch-break integrated mold shown in FIG. 1;

FIG. 5 is a cross-sectional view of a necking die provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a closing-in mechanism of a closing-in die according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an upper mold according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a material supporting mechanism of the necking die according to the embodiment of the present invention;

fig. 9 is a schematic structural view of a lower mold of a necking mold according to an embodiment of the present invention;

fig. 10 is a schematic structural view of the upper forming module and the upper and lower sliding plates according to the embodiment of the present invention.

Reference numerals:

1, mounting a mold; 11-an upper die holder; 12-a closing mechanism; 121-upper forming module; 122-forming the mounting portion; 123-a forming insert; 124-a slide block; 125-a connecting part; 126-a bottom plate; 2-lower mould; 21-a lower die holder; 22-a retainer body; 23-a positioning mechanism; 231-lower molding module; 24-a limiting plate; 25-a reset mechanism; 3, an upper guide plate; 4-a lower guide plate; 5-pressing the material body; 6-nitrogen spring; 7-rectangular spring; 8, an upper sliding plate; 9-a lower sliding plate; 10, mounting a mold; 101-an upper die holder; 102-stretching the female die; 1021-an accommodation; 1022-stretching the insert; 1023-a cavity; 103-a withdrawing mechanism; 20-lower mould; 201-a lower die holder; 202-lower extrusion block; 203-stretching male die; 30-blank holder; 301-loop body; 302-blankholder insert.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be further explained with reference to specific embodiments.

Example 1

As shown in fig. 1 to 4, the stretch-extrusion-breaking integrated mold provided in this embodiment includes an upper mold 10 and a lower mold 20; the upper mold 10 includes a drawing die 102; the lower die 20 comprises a drawing male die 203 and a lower extruding block 202 arranged around the outer periphery of the drawing male die 203; when the sheet material contacts the lower breaking block 202 during the descending process, the lower port of the cavity 1023 of the stretching female die 102 and the lower breaking block 202 can break the sheet material.

The lower port of the cavity 1023 of the drawing die 102 in the present invention means at the edge of the lower end of the cavity 1023 of the drawing die 102. The lower breaking block 202 arranged around the outer periphery of the drawing punch 203 means that the lower breaking block can be arranged around the outer wall of the drawing punch 23, or as shown in fig. 1, the lower breaking block can be arranged around the edge of the lower port of the drawing punch 23.

When the stretching and squeezing integrated die provided by the embodiment is used, an operator places a plate on the upper portion of the stretching male die 203 of the lower die 20, the press machine drives the upper die 10 to move downwards, and when the stretching female die 102 of the upper die 10 contacts with the plate and then moves downwards, the plate is stretched under the action of the stretching male die 203 and the stretching female die 102. When the stretching female die 102 of the upper die 10 continues to move downwards to the position of the lower extrusion block 202 on the stretching male die 203, the bottom surface of the plate material contacts with the lower extrusion block 202, at this time, because the top surface of the plate material contacts with the stretching female die 102, namely the plate material is clamped between the stretching female die 102 and the ring body, the port of the concave cavity 1023 of the stretching female die 102 and the lower extrusion block 202 extrude the plate material, and finally the upper die 10 moves upwards, and the formed workpiece is taken out. The die provided by the invention can integrally realize the stretching and extrusion breaking of the plate without trimming and flanging, one set of die can realize the traditional three-step die process, the required material is less, the material cost is low, the assembly and debugging procedures of one set of die are simple, the working time, labor and processing and debugging equipment for assembling and debugging the die are reduced, the storage space and later-stage transportation cost of the die are reduced, the integral forming and later-stage production of stamping parts are realized, the labor, equipment, time and other costs are saved, the production efficiency is improved, the applicability is strong, and box-shaped parts such as general oil tank end covers and the like can be suitable for the die.

Specifically, the lower extrusion block 202 is horizontally spaced from the lower end of the cavity 1023 by a distance less than the thickness of the slab. The gap between the two is smaller than the thickness of the plate, so that the plate is extruded and broken. The horizontal distance between the two is set according to different plate thicknesses and can be adjusted according to actual processing requirements. Preferably, the horizontal spacing between the two is zero, that is, the inner edge of the port 1023 of the drawing die 102 and the outer edge of the crushing insert are located on the same vertical line, so that the crushing effect is better.

As shown in fig. 1 and 3, further, the lower mold 20 includes a lower mold base 201; the top of the lower extrusion block 202 is positioned below the bottom surface of the stretching male die 203, the bottom of the lower extrusion block 202 is fixed with the lower die holder 201, and the outer edge of the lower extrusion block 202 protrudes out of the side surface of the stretching male die 203. That is, the lower breaking block 202 is provided at the bottom of the drawing punch 203, and the protrusion of the outer edge of the lower breaking block 202 from the side surface of the drawing punch 203 means that the outer edge of the lower breaking block 202 is located outside the drawing punch 203 as viewed from the front-rear direction of the die. The die maker can adjust the height of the lower extrusion block 202 according to the actual processing requirement, so as to adjust the extrusion position of the plate material, and meanwhile, the lower extrusion block 202 is convenient to process and install.

The cross-sectional shape of the lower extrusion block 202 is square. The square upper left corner and the port of the concave cavity 1023 of the stretching female die 102 mutually extrude and break the plate, and the upper left corner plays a role similar to a knife edge and can quickly extrude and break the plate. Of course, the cross section of the lower extrusion block 202 may be trapezoidal, so long as the plate can be extruded and broken.

As shown in fig. 1, the upper die 10 includes an upper die base 101; the stretch die 102 includes stretch inserts 1022 around the outside perimeter of the cavity 1023; the stretching insert 1022 forms a lower port of the concave cavity 1023, and the stretching insert 1022 is fixed on the upper die base 101; when the slab contacts the lower breaking block 202 during the descent, the stretching inserts 1022 and the lower breaking block 202 can break the slab. The fact that the stretch insert 1022 forms the lower end opening of the cavity 1023 means that the cavity surrounded by the stretch insert 1022 forms part of the cavity 1023, and the stretch insert 1022 can be provided with a material having a higher strength than the upper die base, thereby increasing the strength of the upper die 10 without causing excessive costs.

Preferably, the upper die holder 101 is provided with an annular mounting groove that receives the tension insert 1022.

Further, the die provided by the invention also comprises a blank holder; the blank holder is used for being placed on a telescopic mechanism of a machine tool; the telescoping mechanism is used to jack the blankholder and enable the blankholder 30 to move downward under the pressure of the upper die 10. Initially, the blank holder 30 is located at a position higher than the drawing male die 203 under the action of the telescopic mechanism, a user places a sheet on the blank holder 30, the upper die 10 moves downward, the upper die 10 and the blank holder 30 press the sheet tightly and then continue to move downward to realize sheet drawing, and when the drawing process is finished, the lower breaking block 202 and the drawing female die 102 break the sheet in a squeezing manner.

Further, the blank holder 30 includes a holder body 301 and a blank holder insert 302 mounted on the holder body 301 and having a ring shape. The binder inserts 302 and binder 30 can be made of different materials as desired.

As shown in fig. 1, further, the drawing die 102 further includes a withdrawing mechanism 13; the ejection mechanism 13 is used for ejecting the formed workpiece in the cavity 1023 of the drawing female die 102. When the sheet material is extruded and broken, the workpiece is molded, the upper die 10 moves upwards, the molded workpiece is clamped in the concave cavity 1023 of the stretching female die 102 due to expansion, and at the moment, the ejection mechanism 13 ejects the molded workpiece in the concave cavity 1023 of the stretching female die 102 out of the concave cavity 1023, so that the molded workpiece is convenient to take out. Further, the drawing die 102 further includes a receiving portion 1021 at the top of the cavity 1023, and the piece returning mechanism 13 includes a nitrogen spring and a piece returning device, wherein the nitrogen spring pushes the piece returning device to move downwards to penetrate into the cavity 1023 so as to eject the formed workpiece.

Example 2

As shown in fig. 1 to 10, the present invention further provides a processing tool, which includes the stretch breaking integrated mold and the closing mold, wherein the closing mold includes an upper mold 1, a lower mold 2 and an upper driving portion; the upper die 1 comprises an upper die holder 11 and a closing mechanism 12 movably connected on the upper die holder 11; the closing-in mechanism 12 is annular and the annular shape can be stretched; the lower die 2 is used for placing an end cover; the upper driving part is used for driving the closing mechanism 12 to contract so as to extrude, close and mold the circumference of the end cover in the annular inner part of the closing mechanism. The ring shape of the closing-in mechanism 12 is capable of stretching and contracting, which means that the size of the ring shape can be increased or decreased (when the ring shape is circular, the diameter of the ring shape can be increased or decreased). When using, extrude disconnected integral type mould processing end cover through foretell tensile earlier, be located the annular inside of close-up mechanism 12 with the end cover again, utilize the upper drive portion with the 12 shrink of close-up mechanism, close-up mechanism 12 shrinks into the annular that the size diminishes promptly, close-up mechanism 12 contracts in-process and contacts and extrudees the end cover border and carry out the end cover binding off shaping with the end cover border, realize the one-time binding off shaping, and binding off size precision is high, do not need adjustment many times and stability, the production efficiency is improved, one set of close-up mould can be applicable to not unidimensional end cover binding off, it is little to occupy the factory building. The end cover is firstly processed by the stretching and extruding die, and then the closing-in die is used for closing in.

The closing-in mechanism 12 may be a plurality of arc sections with two ends inserted into each other, and the arc sections may move toward the center of the ring or in the opposite direction, so that the size of the ring enclosed becomes smaller or larger, and the opening and closing-in mechanism 12 is extended and contracted.

As shown in fig. 6 and 7, preferably, the necking mechanism 12 includes a plurality of upper forming modules 121 arranged in a ring shape; the upper driving part is used for driving the upper forming module 121 to move towards the annular inner part thereof so as to shrink the annular shape of the closing-in mechanism 12. When in use, the upper driving part drives the plurality of upper forming modules 121 to move towards the end cover direction (at this time, the ring shape of the closing mechanism 12 shrinks), and contacts with the circumference of the end cover to press the end cover for closing. The closing-up mechanism 12 is arranged into a plurality of forming modules, so that the setting and the processing are convenient.

As shown in fig. 8 and 9, further, the lower mold 2 includes a lower die base 21; the upper driving part is an upper guide plate 3 which is arranged on the lower die holder 21 and is annularly arranged; the end cover is placed in the ring formed by the upper guide plate 3; the upper guide plate 3 inclines towards the direction far away from the end cover; when the upper forming module 121 contacts the upper guide plate 3 during the downward movement, the upper guide plate 3 can drive the upper forming module 121 to move towards the annular inner direction and press the end cover periphery to close and form. Since the upper guide plate 3 is inclined in a direction away from the end cap, that is, in a direction away from the closing-in mechanism 12 to form a circular center. The press drives the upper die 1 to move downwards, the upper forming module 121 gradually contacts the upper guide plate 3 on the lower die holder 21 in the downward moving process and abuts against the inclined surface of the upper guide plate 3, and under the action of the inclined surface, the upper forming module 121 starts to move towards the annular inner direction while descending (namely, the upper forming module 121 descends and moves horizontally), and gradually abuts against the end cover periphery to extrude the end cover periphery for forming. Preferably, when the upper forming module 121 descends to the lowest position of the upper guide plate 3, the upper forming module 121 and the end cover circumference realize the closest extrusion, and the closing-in forming is completed.

As shown in fig. 10, the bottom of the upper forming module 121 is preferably a base plate 126 that is obliquely arranged, and the base plate 126 is parallel to the upper guide plate 3 and slides in cooperation with the upper guide plate 3. In the descending process of the upper forming module 121, the bottom plate 126 gradually contacts with the upper guide plate 3 and moves downwards in cooperation with the upper guide plate 3, and the whole closing process can be stably carried out by the cooperation of the bottom plate and the upper guide plate.

Wherein, the upper guide plate 3 can be an integral annular plate, namely, the whole plate is in an inverted truncated cone shape, and the inclination of the upper guide plate 3 means that the side wall of the upper guide plate is inclined.

Preferably, the upper guide plate 3 comprises a plurality of upper sub guide plates which are annularly arranged, and the plurality of upper sub guide plates and the plurality of upper forming modules 121 are arranged in a one-to-one up-and-down correspondence; the upper sub guide plate inclines towards the direction far away from the end cover; when the upper forming module 121 contacts with the upper sub-guide during the downward movement, the upper sub-guide can drive the upper forming module 121 to move towards the annular inner direction and press the periphery of the end cover to close up and form. That is, the upper guide plate 3 includes a plurality of upper sub-guide plates, and each upper sub-guide plate is respectively matched with one upper forming module 121 to drive the upper forming module 121 to move, so that the processing is convenient to arrange.

Further, the upper die base 11 has a slide way inclined toward the end cover, and the upper forming module 121 is slidably disposed on the slide way. Since the upper forming module 121 performs horizontal movement under the action of the upper guide plate 3, the slide rail can play a role of guiding the movement of the upper forming module 121, so that the movement process is stable.

Wherein, a hole can be arranged on the upper die base 11, the inner cavity of the hole is the slideway, and the forming module penetrates through the hole and slides in the hole.

As shown in fig. 10, preferably, the upper die base 11 is provided with an upper sliding plate 8 and a lower sliding plate 9 which are arranged in parallel and spaced up and down, the upper sliding plate 8 and the lower sliding plate 9 are arranged obliquely towards the end cover, and a slideway is formed between the upper sliding plate 8 and the lower sliding plate 9. The upper slide plate 8 and the lower slide plate 9 play a guiding role at the same time, and the friction force is also reduced.

As shown in fig. 10, further, the upper molding module 121 includes a molding mounting portion 122 and a molding insert 123 detachably and fixedly connected to the molding mounting portion 122; the forming installation part 122 is connected with the slideway in a sliding mode, and the forming insert 123 is used for extruding, closing and forming the periphery of the end cover in the annular inner part. The user can choose to install the forming insert 123 with different shapes to realize different closing-in shapes of the end cover, can realize closing-in with complex shapes, and improves the applicability.

As shown in fig. 10, further, the mold mounting portion 122 includes a slider 124 and a connecting portion 125; the slide block 124 is obliquely arranged between the upper slide plate 8 and the lower slide plate 9 and is parallel to the upper slide plate 8; the upper end of the connecting portion 125 is fixed to the upper end of the slider 124, and the forming insert 123 is fixed to the connecting portion 125. That is, the upper forming module 121 is hung on the upper die base 11 by the cooperation of the sliding block 124 and the upper and lower sliding plates 9, and can move in the channel between the upper and lower sliding plates 9.

As shown in fig. 8 and 9, the lower mold 2 further includes a material supporting mechanism and a lower driving portion; the material supporting mechanism comprises a material supporting body 22 and a positioning mechanism 23 movably connected to the material supporting body 22; the positioning mechanism 23 is annular and the annular shape can be stretched; the lower driving part is used for driving the positioning mechanism 23 to stretch and is abutted with the circumference of the end cover positioned at the annular outer part of the lower driving part so as to position the end cover. When the end cover positioning device is used, the end cover is placed on the material supporting body 22, the lower driving part drives the positioning mechanism 23 to stretch out and abut against the inner wall at the end opening of the end cover, the end cover is positioned after the end opening of the end cover is gradually expanded, and the end cover is positioned on the lower die 2.

The positioning mechanism 23 may be a plurality of arc segments with two ends inserted into each other, and the arc segments may move toward the center of the ring or in the opposite direction, so that the size of the ring formed by the arc segments is reduced or increased, and the positioning mechanism 23 is extended or contracted.

As shown in fig. 8, preferably, the positioning mechanism 23 includes a plurality of lower molding modules 231 arranged in a ring shape; the lower driving part is used to drive the lower molding block 231 to move toward the annular outer portion thereof to extend the positioning mechanism 23. When in use, the lower driving part drives the plurality of lower forming modules 231 to move towards the direction away from the center of the end cover (at this time, the ring of the closing-in mechanism 12 is expanded), and the lower driving part gradually contacts and abuts against the inner wall of the periphery of the end cover to realize the positioning function. The positioning mechanism 23 is provided as a plurality of lower molding modules 231, which facilitates the setting and processing.

As shown in fig. 5, further, the material supporting body 22 is connected with the lower die base 21 in a sliding manner up and down; the lower driving part is a lower guide plate 4 which is arranged on the lower die holder 21 and is annularly arranged; the lower guide plate 4 forms a ring shape and is positioned in the periphery of the end cover; the lower guide plate 4 is inclined toward the annular center direction thereof; when the lower forming module 231 contacts the lower guide plate 4 during the downward movement of the lower forming module 231, the lower guide plate 4 can drive the lower forming module 231 to move towards the outside of the ring enclosed by the lower forming module and position the end cover. That is, during the downward movement of the material supporting body 22, the lower forming module 231 on the material supporting body 22 gradually contacts the lower guide plate 4 and moves in the direction away from the annular center of the lower guide plate 4 (i.e., the lower forming module 231 descends and also moves horizontally) under the action of the lower guide plate 4, and gradually abuts against the inner wall of the periphery of the end cover to position the end cover. Preferably, a limiting plate 24 is fixed on the lower die holder 21, the limiting plate 24 is located in the direction of the lower molding module 231, and when the limiting plate 24 is contacted in the process of descending the lower molding module 231, the downward movement is stopped, and at this time, the positioning of the end cover is completed. The retainer plate 24 also functions to support the lower molding block 231.

Preferably, the side of the lower forming module 231 is an obliquely arranged side plate, which is parallel to the lower guide plate 4 and is matched with the lower guide plate 4 for sliding. The side plates cooperate with the lower guide plate 4 to allow the lower molding block 231 to move smoothly.

Wherein, lower baffle 4 can be the integral type annular plate, and the whole looks like the round platform shape promptly, and lower baffle 4 slope means that its lateral wall inclines.

Preferably, the lower guide plate 4 comprises a plurality of lower sub-guide plates arranged in a ring shape, and the plurality of lower sub-guide plates are arranged in one-to-one correspondence with the plurality of lower forming modules 231; the lower sub-guide plate is inclined towards the annular center of the lower guide plate 4; when the lower forming module 231 contacts the lower sub-guide during the downward movement, the lower sub-guide can drive the lower forming module 231 to move towards the outside of the ring enclosed by the lower forming module and position the end cover. That is, the lower guide plate 4 includes a plurality of lower sub-guide plates, and each lower sub-guide plate is respectively matched with one lower forming module 231 to drive the lower forming module 231 to move, so that the setting and processing are convenient.

As shown in fig. 5, a resetting mechanism 25 is further disposed on the lower die base 21, and the resetting mechanism 25 is used for retracting and resetting the positioning mechanism 23. That is, after the closing-up forming of the end cap is completed, the lower forming module 231 of the positioning mechanism 23 still abuts against the inner wall of the circumference of the end cap, and the positioning mechanism 23 is retracted by the resetting mechanism 25 to be reset, so that the lower forming module 231 of the positioning mechanism 23 is separated from the end cap, and the end cap is taken out. The reset mechanism 25 may be an elastic element such as a spring, and when the positioning mechanism 23 is positioned, the elastic element is squeezed, and after the closing is completed, the elastic force of the elastic element drives the positioning mechanism 23 to separate from the end cover.

Preferably, a return spring is fixed on the upper die holder 11, one end of the return spring is connected with the upper forming module 121, the return spring is extruded when the upper forming module 121 moves in the closing process, and the return spring resets the upper forming module 121 to the initial position after the closing process is completed and the upper die 1 moves upwards.

Further, an upper elastic element is arranged on the upper die base 11, and a lower elastic element for supporting the supporting body 22 is arranged on the die base; during the downward movement of the upper die holder 11, the upper elastic member abuts against the material supporting body 22 and pushes the material supporting body 22 to move downward, the lower forming module 231 on the material supporting body 22 starts to contact the lower guide plate 4, the lower forming module 231 moves under the action of the lower guide plate 4 and positions the end cover, and then the upper forming module 121 starts to contact the upper guide plate 3 and moves under the action of the upper guide plate 3 and closes the end cover. The upper elastic member may be a nitrogen spring 6, and the lower elastic member may be a rectangular spring 7. Furthermore, a material pressing body 5 is further arranged on the upper die base 11.

In summary, the whole using process of the closing-up die provided by the invention is as follows: the end cover processed by the stretch breaking die is placed on the supporting body 22 by a user, at the moment, the lower forming module 231 is located below the end cover and inside the circumference of the end cover, the press drives the upper die 1 to move downwards, because the elasticity of the lower elastic part (the rectangular spring 7) is smaller than that of the upper elastic part (the nitrogen spring 6), the upper elastic part (the nitrogen spring 6) firstly contacts the supporting body 22 and drives the supporting body 22 to move downwards on the lower die base 21, meanwhile, the lower forming module 231 on the supporting body 22 also moves downwards, the lower forming module 231 gradually contacts the lower guide plate 4 in the downward movement process, and starts to move towards the annular outer direction under the action of the lower guide plate 4, the lower forming module 231 stops descending after abutting against the limiting plate 24 in the descending process, at the moment, the lower forming module 231 abuts against the inner wall of the circumference of the end cover, and the circumference of the end cover is supported and positioned. After the end cap is positioned, the upper die 1 continues to move downwards, and the pressing body 5 starts to press on the end cap, so that the end cap is kept still during side molding. After the end cover is pressed, the upper forming module 121 starts to contact the upper guide plate 3, and moves towards the end cover while descending under the action of the upper guide plate 3, and gradually abuts against the outer wall of the periphery of the end cover to squeeze and close the end cover. After the closing-in molding, the upper die 1 is lifted, the material supporting body 22 moves upwards under the action of the lower elastic piece (rectangular spring 7), the lower molding module 231 moves towards the annular center of the lower molding module under the action of the reset mechanism 25 to be closed and separated from the end cover, and finally, the molded end cover is taken down. The invention can also be applied to other workpieces except the end cover of the automobile oil tank.

The necking die provided by the invention has the following advantages:

1. the one-time extrusion closing-in molding has high closing-in size precision, does not need to be adjusted for many times and is stable;

2. a complex closing-up shape can be formed, and the production efficiency is improved;

3. different closing sizes can be realized by one set of mould, the mould does not need to be changed, and the occupation of factory space is reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A stretching and extruding integrated die is characterized by comprising an upper die and a lower die;

the upper die comprises a stretching female die;

the lower die comprises a stretching male die and a lower extrusion block arranged around the periphery of the stretching male die;

when the plate is contacted with the lower extrusion breaking block in the descending process, the plate can be extruded and broken by the lower port of the concave cavity of the stretching female die and the lower extrusion breaking block.

2. The stretch-break integrated die of claim 1, wherein the lower break block has a horizontal spacing from the lower port of the cavity in a horizontal direction that is less than the thickness of the slab.

3. The stretch-extrusion one-piece mold of claim 2, wherein the horizontal spacing is zero.

4. The stretch-extrusion-break integrated die of claim 1, wherein the lower die comprises a lower die holder;

the top of the lower extrusion block is positioned below the bottom surface of the stretching male die, the bottom of the lower extrusion block is fixed with the lower die holder, and the outer edge of the lower extrusion block protrudes out of the side surface of the stretching male die.

5. The stretch-extrusion one-piece mold according to claim 1, wherein the lower extrusion block is square in cross-sectional shape.

6. The stretch-extrusion-break integrated die of claim 1, wherein the upper die comprises an upper die base;

the stretching female die comprises a stretching insert surrounding the outer periphery of the concave cavity; the stretching insert forms the lower port of the concave cavity and is fixed on the upper die holder; when the sheet material contacts with the lower extrusion breaking block in the descending process, the sheet material can be extruded and broken by the stretching insert and the lower extrusion breaking block.

7. The stretch-extrusion one-piece mold according to claim 6, wherein the upper die base is provided with an annular mounting groove for receiving the stretch insert.

8. The stretch-extrusion-break integrated die of claim 1, further comprising a blank holder; the flattening ring is used for being placed on a telescopic mechanism of a machine tool, the telescopic mechanism is used for jacking the blank holder, and the blank holder can move downwards under the pressure of an upper die.

9. The stretch-break integrated die of claim 8, wherein the blankholder comprises a ring body and a blankholder insert mounted on the ring body and having an annular shape.

10. A tooling comprising a necking die and the stretch-break integral die of any of claims 1-9;

the closing-up die comprises an upper die, a lower die and an upper driving part;

the upper die comprises an upper die base and a closing mechanism movably connected to the upper die base;

the closing mechanism is annular, and the annular shape can stretch out and draw back;

the lower die is used for placing an end cover;

the upper driving part is used for driving the closing mechanism to contract so as to extrude, close and mold the periphery of the end cover in the annular inner part of the closing mechanism.

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