CN218486973U - Plate drawing equipment and drawing die - Google Patents

Abstract

The utility model relates to a sheet material equipment and drawing die that draws, including quiet mould (4), movable mould (1) and brake bead compact structure, wherein, brake bead compact structure has the tight face of clamp that is used for pressing sheet material (2) brake bead (8) position around, is equipped with punch a hole terrace die (7) on the quiet mould, is equipped with punch a hole die (6) on the movable mould, and the terrace die that should punch a hole and the die that punches a hole all are arranged corresponding to pressing from both sides tight face, and respective position and size correspond to set up to: in the drawing working process, when the movable die reaches the back-flushing hole position before the drawing stroke end point, the punching set point (11) around the pressed drawing rib of the plate is synchronously back-flushed along with the movement of the movable die. The utility model discloses utilize the characteristics of drawing last shaping stage material inflow, design unique recoil hole drawing equipment ingeniously, form the locating hole in the sheet material drawing process in step, it has the advantage that positioning accuracy is high, the adaptation face is wide, be convenient for install.

Description

Plate drawing equipment and drawing die

Technical Field

The utility model relates to a sheet processing equipment specifically relates to a sheet drawing equipment. Furthermore, the utility model discloses still relate to the dedicated drawing die of this sheet material drawing equipment.

Background

In various industries, especially in the heavy-duty machinery industry, the vehicle industry and other industries, the sheet metal is generally placed on drawing equipment (such as a press) provided with a drawing die for drawing, and then is formed by working procedures such as trimming, flanging and shaping. Generally, drawing is a single process, a part needs to be continuously processed from the drawing process to a subsequent process, and profile positioning, edge positioning or the simultaneous positioning of the profile positioning and the edge positioning are generally adopted in the subsequent process of the part after drawing.

For the parts with relatively complex shapes, the positioning accuracy can basically meet the requirement due to more process reference characteristics such as available molded surfaces and the like on the parts, but the positioning mode is relatively complex, and the positioning accuracy is inevitably influenced by drawing deformation to a certain extent. In addition, especially for parts with relatively simple modeling, because relatively reliable process reference features which can be utilized on the parts are few, profile positioning, edge positioning and the like are reluctant to be adopted, and the positioning precision is difficult to meet the requirement of high precision of products. For example, for some parts, in order to reduce the die cost of the trimming and punching process, the trimming and punching is replaced by cutting with a three-dimensional laser device and a simple special fixture, but the product precision is difficult to meet the high-precision assembly requirement due to the lack of a reliable positioning structure of the simple fixture.

In order to simplify the positioning of the various subsequent steps after drawing and to increase the positioning accuracy, the person skilled in the art also thinks of hole positioning and has for a long time made numerous technical attempts and improvements. However, since the drawing process itself is a relatively special process which is easy to cause part deformation, and the parts are basically sheet-type parts, it is extremely difficult to process the positioning holes in the drawing process, and the positioning holes formed by processing are often difficult to meet the precision requirement as the positioning reference. In addition, because the punching process generally punches holes through the punching motion of a punching male die and is matched with a static punching female die, in the drawing equipment, an upper die is generally a movable die, the drawing process of the drawing equipment needs the movable die to carry out drawing motion, the plate generally moves along with the movable die, the punching die is additionally arranged on the drawing equipment, a secondary punching motion driving structure and a corresponding special plate plane part suitable for punching are often required to be designed, the structural complexity of the drawing die or the drawing equipment is greatly increased, particularly, due to the complexity of deformation of the plate of the drawing process, the prior arts lack technical pertinence, positioning holes machined by the prior arts are also proved in the practical use of subsequent processes, and the positioning precision of the process positioning holes is often difficult to meet the requirement.

For example, chinese invention patent CN101869943B (application number: CN 201010215362.4) discloses a punching device and a sheet positioning method for a drawing die, which belong to the technology of installing a positioning hole of a post-processing process of the punching device on the drawing die. Specifically, referring to fig. 1 of the prior art, the punching device for the drawing die in the prior art comprises a support 1, a punching female die 2, a bush 3, a punching male die 5 and a pressing sleeve 6 (namely a blank holder), wherein the punching female die 2 is installed at the lower part of the support 1, the punching male die 5 is installed at the upper part of the support 1, the punching female die 2 and the punching male die 5 located above the punching female die are matched in shape for punching, the bush 3 is sleeved inside the punching female die 2, the pressing sleeve 6 is sleeved outside the punching male die 5, and the bush 3 and the pressing sleeve 6 located above the bush are matched in shape for pressing shape storage.

The main purpose of this prior art complex structure is to punch pilot holes in the scrap part of the article being manufactured during the drawing process. The drawing-punching mechanism shown in fig. 1 needs to be mounted on a flat plane of at least phi 40mm of the waste region in the upper and lower mold cavities. When drawing is nearly completed, firstly, a punching male-female die punches a positioning hole required by a subsequent process, then, a pressing sleeve and a lining sleeve tightly press the positioning hole and a surrounding area and press the positioning hole and the surrounding area into a certain shape for storing materials, so that the deformation of the positioning hole can be relieved to a certain degree, the deformation generated in the subsequent process is controlled to be uniform deformation, and the waste materials can be smoothly ejected through the relative position difference between an ejection pin and the punching male die.

This typical prior art solution has the following serious drawbacks: firstly, the forward punching process needs to be installed on a flat plane with a waste area of phi 40mm at least, but the selection of the position of a positioning hole in the waste area has higher requirements on the shape of waste and the inflow of material in the forming process of a part material, and the waste area generally refers to a waste area in a molded surface and is not waste on a blank holder, so that the selection of the position of the positioning hole is severely restricted by the design and the shape of the part; second, this prior art technique is limited by the punching configuration and is essentially not applicable on relatively deep drawn parts; thirdly, in the prior art, the punching male die on the flat plane with the diameter of phi 40mm protrudes out of an upper die cavity of a drawing die, so that the normal inflow of materials is not facilitated, the phenomena that the punching male die is worn and a plate is scratched frequently occur, and the defects of points wrapping or crushing damage and the like exist on the surface of a product; fourthly, the drawing die or drawing equipment in the prior art is extremely complicated in structure, a punching male die and a punching female die are required to be additionally arranged, the shape of a waste material area of the drawing die is required to be specially designed, and in addition, the shapes of the lining 3 and the material pressing sleeve 6 also need to be designed in a matched mode; fifth, in the prior art, the material pressing sleeve and the bushing are used for pressing the positioning hole and the surrounding area tightly and pressing out the material with a certain shape to store the material, so that deformation of the positioning hole is relieved, but the process is complex, the actual process is not ideal, the positioning hole is prone to large deformation, and the rejection rate is high.

The current situation of the prior art is limited by the universality of material deformation in the drawing process, so that the subsequent processing of the positioning hole after drawing becomes a technical problem which is difficult to solve, and a proper and accurate technical scheme is difficult to find all the time.

In view of the above, there is a need to design a drawing apparatus with post-process locating hole processing function and a matched mold thereof, which can overcome the above technical problems and effectively solve or alleviate the above technical difficulties.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the basic technical problem that a sheet material draws equipment is provided, this sheet material draws equipment can accomplish the processing of follow-up locating hole in step in the drawing process, and its technology science, corollary equipment are simple to basically there is not deformation, effectively guarantee the positioning accuracy requirement.

Furthermore, the utility model discloses the technical problem that still need solve is a drawing die, and this drawing die can be applied to the utility model discloses a sheet material equipment of drawing for sheet material equipment of drawing can be to the processing of the follow-up locating hole of sheet material drawing in-process synchronous completion, and the locating hole does not have the deformation basically, effectively guarantees the positioning accuracy requirement.

In order to solve the above-mentioned basic technical problem, the utility model provides a sheet material drawing equipment, compress tightly spacing brake bead compact structure including quiet mould, movable mould and being used for the brake bead to the sheet material, wherein, brake bead compact structure has and is used for the clamping pressure the tight face of clamp at position around the brake bead of sheet material, be equipped with the terrace die that punches a hole on the quiet mould, be equipped with the die that punches a hole on the movable mould, the terrace die that should punch a hole and the die that punches a hole all correspond to press from both sides tight face and arrange, and correspond to set up to with size each other with respective position: in the drawing working process, when the movable die reaches a back-flushing hole position before the drawing stroke end point, the punching set point around the pressed draw bead of the plate is synchronously subjected to back punching along with the movement of the movable die.

Preferably, the recoil hole position is set at a set distance before the drawing stroke end point of the movable die.

More preferably, the set distance is 1 to 5 times the thickness of the slab.

Particularly preferably, the punch set points are located outside the corners of the sheet material to which the draw beads are pressed.

Typically, the movable mold is an upper mold, and the stationary mold is a lower mold.

Preferably, the static die is provided with a stop lug boss used for limiting the drawing stroke end point of the moving die; and/or a waste collecting device for collecting the reverse punching waste is arranged on the movable die.

Preferably, the draw bead pressing structure comprises a blank holder of the plate drawing equipment, wherein the blank holder is provided with the clamping surface, the movable die and the blank holder are mounted on a sliding seat of the drawing equipment and can move relative to each other and move towards the static die, and the clamping surface of the blank holder and the clamping matching surface of the movable die are provided with a flange and a groove which correspond to each other, so that the draw bead can be formed by pressing the movable die and the blank holder against each other and clamping the plate through the flange and the groove.

Specifically, the blank holder is provided with a through hole for the punching male die to pass through.

More specifically, the punching male die and the punching female die are correspondingly arranged on the static die and the movable die at positions outside the corners of the flange and the groove so as to be capable of aligning the punching set points outside the pressed draw bead corners of the sheet material during drawing work.

Furthermore, the utility model also provides a drawing die, wherein, this drawing die is movable mould or the static mould that adopts in above-mentioned arbitrary technical scheme's the sheet material equipment of drawing.

Through the above technical scheme, the utility model discloses a deformation characteristic of drawing equipment in to the sheet material drawing process, the stage nature fine process of its microcosmic deformation is analyzed ingeniously, originality forms recoil hole technology, utilize the inherent movable mould of drawing equipment itself, static mould and compact structure's characteristics and motion process, form unique and generally applicable, the recoil hole structure that the structure is retrencied, in drawing the technology process, synchronous processing forms the locating hole of follow-up procedure, this kind of locating hole not only does not basically have the deformation, satisfy the positioning accuracy requirement of follow-up procedure, and the technology process is simple, it is convenient, corresponding supporting recoil hole structure retrencies, universal practicality has, it need not unnecessary secondary locating hole finishing process or special locating hole processing technology, when the normal drawing technology finishes, can accomplish the processing of locating hole. Moreover, the drawing process and the drawing equipment thereof of the utility model also have the following more specific advantages and technical effects:

first, the utility model discloses an elaborate sheet material of analysis drawing process warp characteristics, carries out meticulous microscopic deformation analysis, utilizes the structural feature and the motion process of drawing equipment self, fuses the utility model discloses creative recoil hole design, position punching out the locating hole around the brake bead of sheet material drawing piece, the material inflow of this position in the part at last drawing forming process is zero basically, utilizes the characteristics of drawing equipment hold-down structure itself, simulates out the technology environment that punches a hole at the specific period of accurate drawing process, and it basically can be regarded as the hole of punching out in the static state, therefore locating hole itself does not have the deformation basically.

Second, the utility model discloses a sheet material equipment of drawing, the subassembly or the structure of punching a hole of adoption combine on the movable mould and the static mould of equipment of drawing ingeniously, not only do not influence normal drawing process, fuse in drawing process completely, can adopt the recoil hole standard component to each model part effectively according to drawing the part model that forms moreover, and the installation of being convenient for improves machining efficiency effectively, has general suitability and economic and technical value.

Third, the utility model discloses a sheet material equipment of drawing, because the utility model discloses the accurate nature of locating hole technology, it need not to form special the level and smooth plane of punching a hole, more need not special guard against or alleviate the supporting structure of the bush of sheet material deformation and so on, and its material use amount of sparingly drawing the part more, feasibility and suitability are higher, and it does not have the requirement to the molding of drawing the sheet material part, can be applicable to the processing requirement of all kinds of product molding locating holes such as deep drawing and shallow drawing effectively.

Fourth, the utility model discloses a sheet material draws equipment, even to the substitution process of some subsequent handling, for example adopt three-dimensional laser cutting to repair towards the product, also provide very big convenience and technological feasibility for these follow-up substitution process design high accuracy flexible fixture.

The utility model discloses a drawing die, it is exclusively used in the utility model discloses a sheet material equipment of drawing also has above-mentioned advantage and technological effect. Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The following drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the scope of the invention to the drawings and the embodiments described below. In the drawings:

FIG. 1 is a schematic diagram of a punching apparatus on a drawing die of the prior art;

FIG. 2 is a block diagram of the steps of the actual process of the plate drawing apparatus according to the embodiment of the present invention;

FIG. 3 is a schematic diagram of the analysis of the material state of a sheet being reverse punched during drawing;

fig. 4 is a schematic structural view of a sheet drawing apparatus according to an embodiment of the present invention, wherein the sheet is in a state before being drawn;

FIG. 5 is a schematic structural view of a sheet material drawing apparatus according to an embodiment of the present invention, wherein the sheet material is in a state of forming a draw bead at the beginning of being drawn;

fig. 6 is a schematic structural view of a sheet drawing apparatus according to an embodiment of the present invention, in which the sheet is in a state where the drawing is completed and a positioning hole is formed by a recoil hole;

the utility model discloses reference number explains:

1 moving die 2 sheet material

3 blank holder 4 static mould

5 waste collecting device 6 female die that punches a hole

7 punch a hole terrace die 8 draw bead

9 Flange 10 groove

11 punch set point 12 vias

13 stop bump 14 material drawing forming area

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and it should be understood that the embodiments described herein are only for the purpose of illustration and explanation, and the scope of the present invention is not limited to the following embodiments.

As mentioned above, in the drawing process, limited by the generality of the drawing deformation, the state of the art is actually a technical bottleneck. For a long time, a technical consensus is: in the drawing process, the plate is not suitable for the punching process because of the drawing deformation motion in the drawing process. The technical inertia recognition is forced by the urgent need of positioning the datum hole in the subsequent process in the actual production, so that in order to meet the actual technical requirements, the processing requirements of the positioning hole are met through various additional punching structures in the drawing process and even manually increasing large-area waste parts on the plate except for the modeling requirement. The structure of the drawing equipment with the positioning hole machining function is extremely complex, but the machined positioning hole is often difficult to meet the requirement of positioning accuracy due to various drawing deformation factors, the development direction of the technical route gradually falls into a difficult-to-break two-difficulty state, namely, a technical gap which is difficult to exceed exists in the positioning requirement of practical production and the great difficulty in technical realization.

In the face of this kind of technological development bottleneck in this field, the utility model discloses the technological difficulty that considers making the breakthrough in the research and development process still need solve the key point of drawing deformation, made a large amount of research and development designs for this reason, drawing deformation simulation test huge in quantity has been carried out, drawing process to huge quantity has carried out simulation analysis, deformation track simulation analysis (CAE) etc. the result of experiment and analysis is unsatisfactory in the very long time actually, this is because the deformation of sheet material in drawing process actually belongs to the moulding deformation of a material inside, in drawing process, even the sheet material that is compressed tightly of draw bead hold-down structure (generally for the blank holder) department of drawing equipment, also there is interior material flow because of the moulding deformation of sheet material, this makes the drawing process of simplifying area locating hole processing function, and ensure that the locating hole is basically indeformable hardly. However, the breakthrough of the technology is often in the process of carelessness, after the project group of the utility model experiences a large amount of early simulation analysis failures, the analysis range of the sheet drawing process is expanded by restarting the simulation analysis, the drawing bead of the sheet is formed until the whole drawing process before the discharging is finished after the drawing, the simulation analysis and the test range are included, and an careless minimum period in the drawing process which leads to the breakthrough of the technology at the moment appears in a large amount of statistical data of the drawing deformation simulation analysis. In order to understand the technical concept of the present invention more deeply, the establishment basis of the technical concept of the present invention and the process concept of the "reverse punching" of the present invention will be explained first.

Referring to fig. 3, fig. 3 shows the normal course of a general drawing process of a sheet 1. Referring to fig. 4 (note that fig. 4 to 6 only show a partial portion of the drawing equipment corresponding to an end of the sheet 2), generally in the process of drawing the sheet 2, the sheet 2 is placed on the blank holder 3, the movable die 1 moves downward, the sheet 2 is formed with a draw bead 8 by mutual extrusion of the movable die 1 and the blank holder 3, the movable die 1 and the blank holder 3 continue to keep a mutually pressed state, so as to press the draw bead 8 and the surrounding portion thereof, and further, the movable die 1 and the blank holder 3 move downward toward the stationary die 4 together, and the sheet 2 is extruded to be drawn and deformed by a drawing cavity structure on the stationary die 4. Referring to fig. 3, as mentioned above, during the drawing process of the sheet 2, the sheet 2 is extruded by the drawing die and continuously undergoes plastic deformation, the material flow inside the sheet 2 is large even around the pressed draw bead 8, as shown by the arrow in fig. 3, the material continuously flows from the edge of the sheet 2 toward the drawing center, and the flow process almost always exists in the whole drawing process. However, as described above, in the simulation analysis of the drawing process for countless times, a large amount of statistical data observation indicates that, when a part approaches the completion of drawing delay (generally, a time period which is 1 to 5 times the thickness of the sheet material 2 before the end of the drawing stroke), the material inflow amount at the position around the draw bead 8 of the sheet material 2 (especially, a local area near the outer side of a corner is more stable), is almost zero at this position, that is, in this short specific stroke period range, the local area on the sheet material 2 is basically in a static state, which is very similar to the process environment of a normal single punching process, and positioning hole processing is performed in this specific stroke period, so that not only deformation is not basically generated, but also the problem of deformation caused by additional drawing is not generated after the positioning hole is synchronously processed and formed because the drawing process is already nearly finished. However, the breakthrough of technical route and technical concept brought by the microscopic fine analysis based on the drawing deformation encounters great technical difficulty in the punching hardware structure of the drawing die. Specifically, as is well known to those skilled in the art, the normal punching process is to move a punching male die, clamp a workpiece to be punched on a punching female die, and punch a hole by using the impact motion of the punching male die (the drawing die with a locating hole processing function in the prior art analyzed above is also a similar forward punching process), and such a forward punching process mainly needs to use the impact kinetic energy of the punching male die to punch a hole. However, in the drawing process of the drawing equipment, since the sheet 2 moves along with the moving die 1 in the drawing process, it is not feasible to perform the forward punching by the drawing motion of the moving die 1, so that the punching in the prior art often needs to specially design a secondary punching motion for the punching male die 7 besides the drawing motion, which results in the extremely complex structure of the drawing equipment.

Therefore, the utility model discloses a project group stretches into the current draw structure of research sheet material drawing equipment, suitably refers to fig. 4, and in the drawing process, when the drawing process was close to accomplishing, sheet material 2 was under the compact condition of draw bead compact structure (generally for blank holder 3) of movable mould 1 and drawing equipment, and typically, draw bead compact structure has the clamping surface that is used for pressing between the draw bead 8 of sheet material 2 position on every side, and it cooperates with the tight fitting surface that presss from both sides of movable mould 1 to can press from both sides draw bead 8 and position on every side. Although the sheet material 2 is in the process of drawing movement along with the moving die 1, the moving die 1 and the draw bead pressing structure of the drawing equipment press the peripheral part of the draw bead 8 of the sheet material 2, and the state of clamping a piece to be punched on the punching female die in the normal forward punching process is extremely similar. To this state, the utility model discloses an item group breaks through the inherent thinking of traditional forward punching a hole, proposes "reverse punching a hole"'s process concept, so-called "reverse punching a hole", utilizes the sheet material promptly in the drawing process, and it is compressed tightly by the drawbead compact structure of movable mould 1 and drawing equipment, under this situation, will punch a hole groove structure and set up on movable mould 1, will punch a hole the terrace die and set up on drawing stationary die 4 simultaneously, with the help of the drawing motion and the impact of movable mould 1 like this for the part (the position around the drawbead) of the specific position that is compressed tightly of sheet material 2 goes to collide the terrace die that punches a hole that the impact is in static, in the drawing motion, accomplishes the processing of punching a hole of locating hole. The process concept of 'reverse punching' changes the design idea of normal forward punching, is skillfully fused into the existing general structure of the drawing equipment, greatly simplifies the structure of the drawing equipment, and simultaneously has the function of processing positioning holes with excellent performance.

The basic embodiments and various preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

In order to help the understanding of the technical solution of the present invention, the following description is first given to the plate drawing equipment with the synchronous processing function of the post-process positioning holes, and the drawing process is induced via the dynamic working process of the drawing equipment. It should be noted that although the drawing process of the present invention can be conveniently and effectively implemented by the drawing apparatus of the present invention, part of the operation of the drawing process of the present invention may not be limited to forming on the drawing apparatus, such as the formation of the draw bead of the sheet material, but may be formed on the preset process of drawing the sheet material in the preamble, although it may be formed at the beginning of the drawing process on the drawing apparatus in general, which will be explained in the following. In addition, although in the utility model discloses an in the drawing equipment that fig. 2 to fig. 6 show, go up the mould and be movable mould 1, the lower mould is quiet mould 4, the utility model discloses but not limited to this, the arrangement form of all kinds of movable moulds and quiet mould of wide adoption on the drawing equipment, for example move from top to bottom quiet, move from left to right quiet or move from left to right etc. it is as long as adopted the technical idea of the utility model, all should belong to the utility model discloses a protection scope. Meanwhile, in the present invention, the use of the terms such as "inner" and "outer" generally means that, with respect to the bead 8, the term "inner" within the range of the bead 8 and the term "outer" outside the range of the bead are used.

Referring to fig. 3 to 6, the utility model discloses basic embodiment's sheet material drawing equipment compresses tightly spacing brake bead compact structure including static mould 4, movable mould 1 and the brake bead 8 that is used for sheet material 2, and wherein, brake bead compact structure has the clamping face that is used for pressing sheet material 2's brake bead 8 position around, is equipped with the terrace die 7 that punches a hole on static mould 4, is equipped with the die 6 that punches a hole on the movable mould 1. Both the punching punch 7 and the punching die 8 are arranged in correspondence with said clamping surface and the respective position and dimensions (in particular the distance of the height of the punching punch 7 with respect to the end of the drawing stroke) need to be elaborated, in particular the position and dimensions of the punching punch 7 and the punching die 6 are reciprocally arranged in correspondence: in the drawing process, when the movable die 1 reaches a back-flushing hole position before the drawing stroke end point, the punching male die 7 contacts the plate 2 pressed on the movable die 1 along with the movement of the movable die 1, and the punching set point 11 around the pressed drawing rib 8 of the plate 2 is synchronously subjected to back-flushing, so that a positioning hole is punched when or before the movable die 1 reaches the drawing stroke end point.

In the basic embodiment of the drawing apparatus described above, it is common for those skilled in the art that the draw bead pressing structure of the drawing apparatus may be the blank holder 3, although it is not limited thereto. The draw bead pressing structure of the drawing equipment can be in various forms, for example, under the condition that the draw bead 8 on the plate material 2 is formed in advance, the draw bead pressing structure on the drawing equipment can even be a plate material clamp attached to the moving die 1. Generally speaking, the draw bead compression structure of the drawing equipment only needs to be matched with the compression surface of the movable die 1 to form a limiting groove for accommodating and limiting the draw bead 8, and meanwhile, the compression surface of the movable die 1 and the matching surface of the draw bead compression structure are mutually extruded to clamp the part around the draw bead 8 of the plate 2, so that the plate 2 is ensured to be fixed and not slide in the drawing process.

In the above drawing apparatus, since the punching male die 7 is mounted on the upper die as the movable die 1, the punching female die 6 is mounted on the lower die as the stationary die 4. As a common structure of the drawing equipment, an upper die generally moves downwards along with a moving seat of the drawing equipment, and the upper die and a blank holder 3 (generally provided with a nitrogen cylinder or a spring) compress a plate 2 so as to be matched with a lower die to draw the plate in the moving process. And when the drawing die moves to a back-flushing hole position close to the drawing stroke end point, the punching male die 7 and the punching female die 6 enter a working state to punch. As described above in the deformation analysis of the sheet 2 during drawing, the sheet 2 is actually punched in a relatively stationary state at the position of the back-flushing hole. The punching position is selected to be a punching set point 11 around the pressed draw bead 8 of the sheet 2 shown in fig. 3 (particularly preferably a punching set point 11 outside the corner of the draw bead 8), which is in the vicinity of the draw bead 8, and the material inflow is almost zero at the specific position when the sheet 2 is close to finishing the drawing, and the sheet 2 is punched at the specific position from the position of a recoil hole at a set distance from the end of the drawing stroke, which is basically equal to the normal punching working environment.

Through the utility model discloses a process and the basic embodiment that draw equipment's above-mentioned technical route, technical concept formed, the utility model discloses a sheet material draws equipment to the deformation characteristic of 2 drawing in-process of sheet materials, the stage meticulous processes of its microcosmic deformation of ingenious analysis, the originality forms recoil hole technology, utilize inherent movable mould 1 of drawing equipment itself, static mould 4 and hold-down structure characteristics and motion process, form unique and generally applicable, the recoil hole structure that the structure is retrencied, in drawing the course of the technology, synchronous processing forms the locating hole of subsequent handling, this kind of locating hole not only basically has not warp, satisfy the positioning accuracy requirement of subsequent handling, and the technological process is simple, convenient, corresponding supporting recoil hole structure retrencies, have universal practicality, need not unnecessary secondary locating hole finishing process or special locating hole processing technology, when the normal drawing technology finishes, can accomplish the processing of locating hole.

On the basis of the basic embodiment described above, the kick hole position may be set at a set distance before the end of the drawing stroke of the movable die 1. Preferably, the starting time of the back-flushing hole is the position of the back-flushing hole with a set distance before the moving die 1 reaches the end point of the drawing stroke, the position of the back-flushing hole is determined according to the thickness of the plate 2, and through repeated tests in the actual research and development process, the distance between the position of the back-flushing hole and the thickness of the plate 2 is set to be 1-5 times of the thickness of the plate 2, so that the kinetic energy of drawing motion can be fully utilized for punching, and the plate 2 can be ensured to be in a stroke section close to the completion of drawing at the moment.

Referring to fig. 4 to 6, the movable mold 1 may be an upper mold, and the stationary mold 4 may be a lower mold. Of course, as described above, the arrangement of the relative positions of the movable die 1 and the stationary die 4 of the sheet drawing device is not limited to this, and the upper die may be the stationary die 4, and the lower die may be the movable die 1, etc., mainly according to the process requirements. In addition, in order to limit the end point of the drawing stroke and avoid the movable die 1 and the static die 4 from colliding with each other to damage the main molded surface of the drawing die, the static die 4 can be generally provided with a stop lug 13 for limiting the end point of the drawing stroke of the movable die 1. When the moving die 1 and the drawing bead pressing structure of the drawing equipment drive the plate 2 to move to the drawing stroke end point, the plate can touch the stop lug 13 and cannot move continuously, and the drawing stroke reaches the end point.

In addition, because the punching die 8 is arranged on the movable die 1, in order to avoid the waste sheets formed by punching and blanking from being discarded or splashed at will, the waste collecting device 5 can be arranged on the movable die 1 corresponding to the punching die 6, so that the blanking of the punching at the positioning hole can be jacked into the waste collecting device 5 by the punching male die 7, and the situation that the blanking splashes at will to influence the safety of drawing equipment or operators is avoided.

With present general sheet material drawing equipment looks adaptation, as the utility model discloses a relatively preferred embodiment, the utility model discloses a draw bead compact structure of equipment can cooperate through blank holder 3 and the movable mould 1 that has the clamping face that the sheet material drawing equipment is last commonly used, have on the movable mould 1 and press from both sides tight fitting surface, to the field of technical personnel familiar with, movable mould 1 and blank holder 3 are generally installed on the sliding seat of drawing equipment and can be for moving each other and can move towards quiet mould 4, have flange 9 and the recess 10 that correspond each other on the clamping face of blank holder 3 and the tight fitting surface of movable mould 1 to can press each other through movable mould 1 and blank holder 3, and through flange 9 and the recess 10 cramp the sheet material forms draw bead 8. Therefore, in the drawing process, the draw bead 8 of the plate 2 is clamped and limited through the matching of the flange 9 and the groove 10, and meanwhile, the part around the draw bead 8 is pressed and compressed between the moving die 1 and the blank holder 3, so that the plate 2 cannot be displaced in the drawing process.

In the case of using the blank holder 3 as a draw bead pressing structure, since the punching set point 11 is located at a peripheral portion of the draw bead 8 (preferably, an outer portion of a corner of the draw bead 8), which is generally clamped between the movable die 1 and the blank holder 3, in the case where the blank holder 3 is in a normal annular shape, in order to avoid the blank holder 3 from affecting the passage of the punching punch 7 on the stationary die 4, the blank holder 3 can be adapted to form a through hole 12 through which the punching punch 7 passes. Of course, the draw bead pressing structures of the practically used drawing equipment are various, the type of the blank holder 3 with the notch also exists, and the through hole 12 can be omitted under the condition that the blank holder does not interfere with the punching motion of the punching male die 7, which is mainly determined according to the practical process.

Further, as mentioned above, on a typical plate drawing device, the draw bead 8 on the plate 2 is formed by extruding the flange 9 and the groove 10 on the moving die 1 and the blank holder 3 at the beginning of drawing, that is, the flange 9 and the groove 10 cooperate to form the draw bead 8, the flange 9 and the groove 10 correspond to the draw bead 8 on the plate 2, the draw bead 8 has a corner, and the flange 9 and the groove 10 also have a corner. Since the punching set point 11 of the present invention is preferably located at the outer part of the corner of the draw bead 8, in order to make the punching male die 7 and the punching female die 6 accurately punch a hole at this punching set point 11, the punching male die 7 and the punching female die 6 need to be correspondingly disposed at the corner outer positions of the flange 9 and the groove 10, and correspondingly disposed at the positions outside the corner thereof, so as to be able to punch a hole at the punching set point 11 which is aligned at the corner outer side of the pressed draw bead 8 of the sheet material 2 in the drawing working process.

Through the aforesaid right the utility model discloses the description of each embodiment of sheet material equipment of drawing can be seen, the utility model discloses although the present various types of equipment of drawing of the general adoption of sheet material equipment of drawing, its drawing die still need carry out certain institutional advancement, need set up the terrace die 7 and the die 6 that punches a hole in the particular position promptly, for this reason the utility model discloses still provide a drawing die, wherein, this drawing die is movable mould 1 or the quiet mould 4 that adopts in the foretell equipment of drawing, and this kind of movable mould 1 and quiet mould 4 belong to the utility model discloses the dedicated mould of equipment of drawing, it also belongs to the utility model discloses a scope of protection.

The above-mentioned mode according to level progressive describes the utility model discloses a sheet material drawing equipment and supporting mould thereof. The following preferred embodiment of the present invention, which is shown with reference to fig. 4 to 6, describes the working process and principle of the present invention, in which the plate drawing apparatus realizes reverse punching in the drawing process: corresponding to the corner outer side position area of the groove 10 of the blank holder 3 of the drawing equipment, a punching male die 7 is arranged on a lower die (a static die 4), and a punching female die 6 is arranged on an upper die (a movable die 1). In the drawing process, after the plate material 2 is placed on the blank holder 3 from the feeding, the upper die starts to move downwards along with a sliding seat of plate material drawing equipment (namely a press), and when the upper die is contacted with the blank holder 3, the plate material 2 is pressed tightly to form a drawing rib 8, as shown in fig. 5. The sliding seat, the upper die, the plate 2 and the blank holder 3 continue to move downwards at the same time, then the plate 2 contacts a die cavity of the drawing lower die (the lower die is fixed on a lower base of drawing equipment and keeps in a static state), and the plate 2 is drawn and formed by the lower die cavity. When the drawing forming is nearly finished (i.e. the lower die reaches the position of the back-punched hole with a set distance before the end of the drawing stroke), the sheet 2 contacts the punching male die 7 installed on the drawing lower die, and then the sheet 2 is punched at the punching set point 11 shown in fig. 2 under the condition that the sheet is pressed by the blank holder 3 and the upper die, and the back-punched hole is also finished at the same time or slightly before the drawing forming is finished, as shown in fig. 6. The workpiece then proceeds to the next process, so that the pilot hole punched out in the drawing process serves as a pilot hole for the next process for improving the dimensional accuracy of the workpiece. The positioning hole is used for positioning in the later process, and the reference conversion is realized by punching other holes in the part, so that the whole size precision of the part is improved. In addition, when the drawing is nearly completed, the plate inflow amount near the corner position of the draw bead 8 of the plate 2 clamped between the blank holder 3 and the upper die is very small, the plate can be regarded as a relative static state, the blank holder 3 plays a pressing role in punching and seeding, normal required conditions of a punching process are met, a positioning hole is basically not deformed, the influence of subsequent deformation of drawing cannot be generated due to the fact that the drawing is nearly completed, and the part punching set point 11 is located in a blank holder waste area, so that the part drawing forming efficiency and quality are not influenced.

The above has specifically described the plate drawing equipment and its working process, but it should be noted that the core technical concept of the present invention is limited to the realization of the drawing equipment with the specific preferred structure shown in fig. 4 to fig. 6, for example, the blank holder 3 can be realized by the alternative type of fixture on other moving dies 1, and in addition, the drawing bead 8 of the plate 2 is not necessarily formed by the plate drawing equipment, and it can be preformed on the plate 2. Therefore, see fig. 2 for a time, the utility model provides a take sheet material drawing equipment of back process locating hole processing function, in its wider course of working of adaptation, can include following step: firstly, drawing a sheet material 2 through drawing equipment provided with a movable die 1 and a static die 4, and pressing a draw bead 8 of the sheet material 2 through a draw bead pressing structure of the drawing equipment in the drawing process; secondly, when the movable die 1 reaches a recoil hole position with a set distance before the drawing stroke end point, a punching set point 11 around a pressed drawing rib 8 of the sheet material 2 is synchronously subjected to reverse punching along with the movement of the movable die 1 through a punching convex die 7 on the fixed die 4 and a punching concave die 6 on the movable die 1, so that a positioning hole is formed by punching when or before the movable die 1 reaches the drawing stroke end point.

In the above processing process, specifically, the set distance may be 1 to 5 times the thickness of the sheet, and of course, the set distance may be outside the above range according to the process requirement, as long as it is ensured that the kinetic energy of the drawing motion can be fully utilized for the punching, and it is ensured that the sheet 2 is in a stroke section close to the completion of the drawing at this time.

In addition, as a general structure adopting typical plate drawing equipment, in the processing process, the draw bead pressing structure can comprise a blank holder 3 and a moving die 1 of the drawing equipment, wherein the blank holder 3 and the moving die 1 are provided with a flange 9 and a groove 10 which correspond to each other, in the drawing process, the moving die 1 and the blank holder 3 are pressed against each other so as to press a limiting draw bead 8 through the flange 9 and the groove 10, and the part around the draw bead 8 is pressed through the moving die 1 and the blank holder 3. Further, before or at the beginning of drawing, the sheet 2 can be clamped and pressed by the moving die 1 and the flange 9 and the groove 10 on the blank holder 3 to form the drawing bead 8.

It can be seen from the above description that, the utility model discloses a sheet material drawing equipment is to the deformation characteristic of sheet material 2 drawing in-process, the stage nature fine process of its micro deformation is analyzed, the structure specificity and the drawing process progress of drawing equipment are creatively combined and the anti-process function that punches a hole is developed, utilize inherent movable mould, static mould and the compact structure characteristics and the motion process of drawing equipment itself, form unique and generally applicable, the recoil hole structure that the structure is retrencied, in the drawing process, synchronous processing forms the locating hole of subsequent handling, this kind of locating hole not only basically has not warp, satisfy the positioning accuracy requirement of subsequent handling, and the process is simple, convenient, corresponding supporting recoil hole structure retrencies, universal practicality, need not unnecessary secondary locating hole finishing process or special locating hole processing technology, when normal drawing technology finishes, can accomplish the processing of locating hole. First, the utility model discloses a 2 characteristics of warping of sheet material of carefully analyzing the drawing process carry out meticulous microcosmic deformation analysis, utilize the structural feature and the motion process of drawing equipment self, fuse the utility model discloses creative recoil hole technical idea, position (especially preferred 8 corner outside positions of draw bead) are washed out the locating hole around the draw bead 8 of 2 drawing pieces of sheet material, and the material inflow of this position in the last draw forming process of part is zero basically, utilizes the characteristics of the compact structure of drawing equipment itself, simulates out the technology environment that punches a hole in the specific period of accurate drawing process, and its hole that can regard as punching out in the static state basically, therefore locating hole itself basically has not warp. Second, the utility model discloses sheet material drawing equipment will punch a hole subassembly or structure and combine on drawing equipment's movable mould and static mould ingeniously to do not influence normal drawing process, it fuses in drawing process completely, can adopt the recoil hole standard component to each model part according to drawing the part type that forms effectively, and the installation of being convenient for improves machining efficiency effectively, has general suitability and economic and technical value. Third, the utility model discloses a sheet material equipment of drawing, because the utility model discloses the accurate nature of locating hole technology, it need not to form special the level and smooth plane specially that punches a hole, more need not special guard against or alleviate the supporting structure of the bush class of 2 deformations of sheet material, and its material use amount of sparingly drawing the part more, feasibility and suitability are higher, and it does not have the requirement to the molding of drawing the sheet material part, can be applicable to the processing requirement of all kinds of product molding locating holes such as deep drawing and shallow drawing effectively. Fourth, the utility model discloses a sheet material draws equipment, even to the substitution process of some subsequent handling, for example adopt three-dimensional laser cutting to repair towards the product, also provide very big convenience and technological feasibility for these follow-up substitution process design high accuracy flexible fixture.

The above description is provided for the preferred embodiments of the present invention, but the present invention is not limited to the details of the above embodiments, and the technical idea of the present invention can be implemented by various simple modifications, which all belong to the protection scope of the present invention. It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims (8)

1. The plate drawing equipment comprises a static die (4), a movable die (1) and a draw bead pressing structure for pressing and limiting a draw bead (8) of a plate (2), and is characterized in that the draw bead pressing structure is provided with a clamping surface for clamping and pressing the peripheral part of the draw bead (8) of the plate (2), a punching male die (7) is arranged on the static die (4), a punching female die (6) is arranged on the movable die (1), the punching male die (7) and the punching female die (6) are both arranged corresponding to the clamping surface, and the respective positions and sizes are mutually matched and correspondingly set as: in the drawing working process, when the movable die (1) reaches a back-flushing hole position before the drawing stroke end point, the back-flushing hole is synchronously performed on a punching set point (11) around the pressed drawing rib (8) of the plate (2) along with the movement of the movable die (1), the back-flushing hole position is arranged at a set distance before the drawing stroke end point of the movable die (1), and the punching male die (7) and the punching female die (6) are correspondingly arranged at the positions outside the corners of the flange (9) and the groove (10) on the fixed die (4) and the movable die (1) so as to align with the punching set point (11) outside the corners of the pressed drawing rib (8) of the plate (2) in the drawing working process.

2. Drawing plant of sheets, according to claim 1, characterised in that said set distance is 1-5 times the thickness of the sheets (2).

3. Drawing plant for sheet material according to claim 1, characterised in that the punching set-points (11) are located outside the corners of the compacted draw bead (8) of the sheet material (2).

4. Drawing plant for sheet materials according to claim 1, characterised in that said moving die (1) is an upper die and said stationary die (4) is a lower die.

5. Drawing equipment for sheet materials according to claim 1, characterized in that said static die (4) is provided with a stop lug (13) for limiting the drawing stroke end point of said movable die (1); and/or a waste collecting device (5) for collecting the reverse punching waste is arranged on the movable die (1).

6. Drawing plant for slabs according to any of the claims from 1 to 5, characterised in that it comprises a blank holder (3) of the drawing plant with the clamping face, wherein the moving die (1) and the blank holder (3) are mounted on a sliding seat of the drawing plant so as to be movable with respect to each other and towards the stationary die (4), the clamping face of the blank holder (3) and the clamping mating face of the moving die (1) having on them a flange (9) and a groove (10) corresponding to each other, so as to be able to form the draw-bead (8) by pressing the moving die (1) and the blank holder (3) against each other and by pinching the slab via the flange (9) and the groove (10).

7. Drawing plant of panels as claimed in claim 6, characterised in that said blankholder (3) is provided with a through hole (12) for the passage of said male piercing punch (7).

8. Drawing die, characterized in that it is a moving die (1) or a stationary die (4) used in a sheet drawing plant according to any one of claims 1 to 7.

Images