CN113770224B - Small fillet pushing and extruding forming device for deep-cavity thin-wall box-shaped component - Google Patents
Small fillet pushing and extruding forming device for deep-cavity thin-wall box-shaped component Download PDFInfo
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- CN113770224B CN113770224B CN202111058408.0A CN202111058408A CN113770224B CN 113770224 B CN113770224 B CN 113770224B CN 202111058408 A CN202111058408 A CN 202111058408A CN 113770224 B CN113770224 B CN 113770224B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
Abstract
The invention belongs to the field of forming and manufacturing of deep-cavity thin-wall metal components, and provides a local small fillet pushing and forming device for a deep-cavity thin-wall box-shaped component. The rigid mold is used for wrapping the constraint side wall and the bottom surface, so that extremely high constraint force can be provided, and the constraint side wall is not deformed and is not unstable. The deformation is limited in the fillet area, so that a large fillet on the deep-cavity thin-wall component obtained by drawing is pushed and extruded into a small fillet, the pushing and extruding forming of small fillets on the periphery and the bottom can be realized, and the problems of poor sticking degree of the fillet area, insufficient size precision of local fillets and the like are effectively solved. Compared with the existing forming method of the deep-cavity thin-wall component, the device does not need to process various rigid dies and use expensive high-grade servo equipment, and all the power elements are simple pneumatic devices, so that the production cost can be greatly reduced for mass production.
Description
Technical Field
The invention relates to the field of forming and manufacturing of deep-cavity thin-wall metal components, in particular to a small round corner pushing and extruding forming device of a deep-cavity thin-wall box-shaped component.
Background
In the fields of aviation, aerospace, automobiles and the like, a deep-cavity thin-wall metal component is a very important component with wide application. FIG. 1 illustrates a typical deep-cavity thin-walled metal component, which is generally divided into axisymmetric cylindrical parts and non-axisymmetric box parts according to the geometry of the component; the axisymmetric cylindrical member has a bottom surface fillet a and the non-axisymmetric box member has a bottom surface fillet a and a side wall fillet b. At present, the batch production of deep-cavity thin-wall components mostly adopts a rigid die multi-pass drawing forming method, the drawing forming of each pass only enables a blank to generate certain deformation, and the blank needs to be subjected to necessary heat treatment between adjacent passes, so the actual production efficiency is low. When the component is a box-shaped part with a non-axisymmetric geometric shape, the problems of serious thickening of a flange area of a deep-drawing part and serious thinning of a fillet area of the side wall close to the bottom part can occur, so that the final component has uneven wall thickness distribution, and the problems of local wrinkling, cracking, poor die attaching degree, insufficient local fillet size and the like can occur. Therefore, the precision forming and the batch production of the deep-cavity thin-wall box-shaped component are difficult. To reduce manufacturing difficulties, deep-cavity thin-walled components are typically designed in an axisymmetric cylindrical shape with a base fillet radius typically greater than 5 times the original blank wall thickness. At present, the forming technology of the cylindrical deep-cavity thin-wall component with the fillet radius larger than 5 times of the wall thickness is mature, and the mass production can be realized.
With the increasing demand of high-end equipment such as aerospace, automobiles, high-speed rails and the like for structural lightweight, lightweight design and manufacture of single components and reasonable layout and combination of multiple components are required. For this reason, it is necessary to design the thin-walled member as an asymmetric deep-cavity thin-walled member having smaller rounded corners, such as a square box in fig. 1 (b). When the square or polygonal box-shaped deep cavity components with small round corners (such as the round corner radius is 2-3 times of the wall thickness of the original blank) are adopted for combination, the gap between the adjacent components can be obviously reduced, the integral rigidity of an assembly structure is enhanced, and the effective cavity volume in each independent component is improved. For example, a lithium battery box in a new energy automobile is a square box-shaped deep-cavity thin-wall component with an extremely small fillet radius, and is an important component which is large in dosage and difficult to replace. However, the molding technology for such a member is not yet developed, and the mass production condition is not yet satisfied.
The invention patent (patent number CN201610689208.8) provides an expansion-compression composite forming method for small fillet characteristics of thin-wall parts. The method comprises two hydraulic forming procedures of preforming and final forming, wherein the preforming is passive hydro-mechanical drawing, an intermediate blank with the height slightly larger than that of a final part and the fillet slightly larger than that of a final small fillet is obtained, the final forming is expansion-compression composite forming, and a small fillet at the bottom of a cylindrical part is formed by utilizing the composite action of a convex die with a local small fillet and internal hydraulic pressure. Although this method can be used to form small corners at the bottom of the cylindrical member, the method and apparatus have the following disadvantages and shortcomings: (1) because the final small bottom fillet is obtained by pressing the blank to the fillet area on the male die through internal liquid pressure bulging, one set of male die and female die can only form a local small fillet with a specific size; (2) because the male die and the female die are of an integral structure, the male die can only compress the preformed blank in a single direction to form a small fillet at the bottom, but cannot form a small fillet at the side wall; (3) the difficulty of establishing a sealing environment in the inner cavity of the irregularly-shaped deep-cavity thin-wall blank is high, a complex hydraulic system for filling liquid, boosting and regulating pressure is needed to ensure the pressure of the inner cavity of the blank, a high-grade servo press for driving a male die to accurately move is also needed, and the equipment is complex and expensive; (4) the minimum fillet size that can take shape is restricted, and the shaping quality is relatively poor or can't take shape when the fillet size is minimum, easily appears the lateral wall unstability, fillet and straightway transition region protrudingly scheduling problem. The method and the device have harsh conditions for forming the small fillet at the bottom of the deep-cavity thin-wall box-shaped component, cannot realize simultaneous forming of the fillet at the bottom and the fillet at the side wall of the deep-cavity thin-wall box-shaped component, and the size of the formed minimum fillet is still limited.
Aiming at the problems that in the process of forming a deep cavity thin-wall component with a minimum fillet radius by the conventional method, a flange area of a deep drawing part is seriously thickened, and a side wall is seriously thinned near a bottom fillet area, so that the wall thickness of the component is unevenly distributed, the component is locally wrinkled, cracked, poor in sticking degree and insufficient in local fillet size, the bottom fillet can only be formed, high production cost and the like caused by the need of using high-grade servo equipment, and the small fillet extrusion forming device of the deep cavity thin-wall box-shaped component is urgently needed to be designed.
Disclosure of Invention
The invention aims to provide a small fillet pushing forming device for a deep-cavity thin-wall box-shaped component, which solves the problems that in the process of forming the deep-cavity thin-wall component with a minimum fillet radius, a flange area of a drawing part is seriously thickened, a fillet area of a side wall close to the bottom is seriously thinned, the final wall thickness distribution on the component is uneven, local wrinkling, cracking, poor die sticking degree and insufficient size of a local fillet are caused, the processing adaptability is poor, only the bottom fillet can be formed, high production cost is caused by the need of using high-grade servo equipment and the like in the existing method.
The technical scheme of the invention is as follows:
a small fillet pushing and forming device for a deep-cavity thin-wall box-shaped component comprises an upper bottom plate 1, a base body 2, a side surface internal support plate 3, a side surface external driving cylinder 4, a side surface external push plate 5, a reset spring 6, a transmission rod 7, an internal support rod 8, a rigid stop block 9, a bottom surface internal support plate 10, a limit wedge block 11, a limit wedge block a11-1, a limit wedge block b11-2, a push rod wedge head 12, an internal driving cylinder 13, a bottom side external driving cylinder 14 and a bottom side external push plate 15;
the upper bottom plate 1 is fixed on the base body 2 on the press slide block; the inner driving cylinder 13 is fixed inside the base body 2 by bolts; the end part of a piston rod of the internal driving cylinder 13 is fixedly connected with one end flange of the transmission rod 7, and the transmission rod 7 moves in the vertical direction along with the piston rod of the internal driving cylinder 13; the other end of the transmission rod 7 is laterally fixed with a rigid stop 9 to limit the extending distance of the piston rod.
The bottom surface internal support plate 10 is rigidly connected with the bottom end of the transmission rod 7 through a connecting rod, and the bottom surface internal support plate 10 moves in the vertical direction along with the transmission rod 7; a bottom surface internal support plate 10 and a bottom surface outer push plate 15 form a gap for placing a component, and the tail end of a piston rod of a bottom side external driving cylinder 14 is connected with the bottom surface outer push plate 15 through a flange; the stop wedge 11 is fixed to the lower portion of the rigid block 9.
The side internal support plate 3 is arranged on the outer side of the periphery of the base body 2, the internal support rod 8 transversely penetrates through the base body 2, one end of the internal support rod is fixed with the side internal support plate 3 through a bolt, and the other end of the internal support rod is rigidly fixed with the push rod wedge 12; in the working process, the push rod wedge head 12 is contacted with the wedge surface of the limiting wedge block 11; a piston rod of the air cylinder 13 extends downwards, the transmission rod 7 follows up, the inner supporting plate 10 of the bottom surface extends downwards, and the limiting wedge block 11 moves downwards simultaneously to extrude the periphery of the inner supporting rod 8 outwards to play an inner supporting role; the side outer pushing plate 5 and the side inner supporting plate 3 form a gap for placing a component, and the end flange of the piston rod of the side outer driving cylinder 4 is connected with the side outer pushing plate 5.
One end of the reset spring 6 is arranged in the mounting hole of the base body 2, and the other end of the reset spring is fixed with the shaft shoulder of the internal support rod 8; the inner support bar 8 is square in cross section in contact with the mounting hole of the base body 2 for the side inner support plates 3 to be at the correct angle in the vertical plane.
The limiting wedges 11 are arranged in an annular 90-degree angle equidistant array and are connected and fixed with the rigid check blocks 9 into a whole; the angle of the inclined plane of the limiting wedge block 11 is 30-90 degrees and is used for controlling the movement of the internal supporting rod 8 to play a limiting role.
When the return spring 6 is in a non-working state, the return spring is not stressed and is in an initial length, and the internal support rod 8 is limited; when the internal support function is performed, the internal support rod 8 extends outwards, and the reset spring 6 is lengthened under the action of tension; the side surface external driving cylinder 4 and the bottom surface external driving cylinder 14 apply force to push inwards, when the internal support rod 8 is gradually retracted inwards, the return spring 6 recovers the original length, and the side surface internal push rod 12 reaches the limit again.
The invention has the beneficial effects that:
(1) the small round corner pushing and extruding forming device for the deep-cavity thin-wall box-shaped component utilizes the rigid mould to wrap the constraint side wall and the bottom surface, can provide extremely high constraint force, and realizes no deformation and no instability of the constraint side wall. The deformation is limited in the fillet area, so that a large fillet on the deep-cavity thin-wall member obtained by drawing is pushed and extruded to form a small fillet, the pushing and extruding formation of small fillets on the periphery and the bottom surface can be realized, and the problems of poor sticking degree of the fillet area, insufficient size precision of a local fillet and the like are effectively solved.
(2) The small round angle pushing and extruding forming device for the deep-cavity thin-wall box-shaped component replaces a forming method of a multi-pass drawing technology, avoids the processing of adopting a plurality of sets of rigid punches and female dies and abandons a complex forming process, and solves the problems of complex and tedious operation, poor processing adaptability, low actual production efficiency and the like in the forming process of the deep-cavity thin-wall small round angle box-shaped component.
(3) The small round angle pushing and extruding forming device of the deep-cavity thin-wall box-shaped component changes the angle or the shape of the wedge block by replacing the pushing and extruding limiting wedge block, and realizes synchronous pushing work in all directions and unidirectional independent (all-direction sequence) pushing work in all directions. Has the advantages of adjustable transformation, multiple forms and wide applicability.
(4) According to the small fillet extruding and forming device for the deep-cavity thin-wall box-shaped component, disclosed by the invention, the large fillet on the deep-cavity thin-wall component is extruded and formed into the small fillet through the extremely small extruding amount, the integral deformation amount is not large, the plastic deformation is controlled in a fillet area, and the stability from the large fillet to the small fillet in the extruding and forming process is ensured.
(5) The small round corner extrusion forming device for the deep-cavity thin-wall box-shaped component achieves the purpose of matching with the peripheral cross section shape of the box-shaped component by changing the cross section shapes of the peripheral outer push plates and the inner supporting plate for forming the box-shaped component with the irregular peripheral side wall shape, so that the small round corner extrusion forming of the component with the special-shaped side wall is realized.
(6) Compared with the existing forming method of the deep-cavity thin-wall box-shaped component, the device does not need to process various rigid dies and use expensive high-grade servo equipment, all the power elements are simple pneumatic devices, and the production cost is greatly reduced for mass production.
Drawings
FIG. 1(a) is a schematic view of a typical deep-well thin-walled cylindrical member;
FIG. 1(b) is a schematic view of a typical deep-well thin-walled box;
FIG. 2 is a schematic three-dimensional structure diagram of a small round corner extruding and forming device of a deep-cavity thin-wall box-shaped component according to the present invention;
FIG. 3 is a schematic view of a partial transmission mechanism of the small round corner pushing and extruding forming device for the deep-cavity thin-wall box-shaped component according to the present invention;
FIG. 4 is a schematic structural view of a wedge block pushing mechanism of the small fillet pushing and forming device for the deep-cavity thin-wall box-shaped component in the invention;
FIG. 5 is a schematic view of the initial working state of the small fillet pushing and extruding forming device for the deep-cavity thin-wall box-shaped component of the invention;
FIG. 6 is a schematic view showing a state of intermediate support in the small round corner push forming apparatus for a deep-cavity thin-walled box-shaped member according to the present invention;
FIG. 7 is a schematic view of a part of different pushing wedges of a small fillet pushing forming device of a deep-cavity thin-wall box-shaped component.
In the figure: 1-fixed upper bottom plate, 2-base body, 3-side internal support plate, 4-side external drive cylinder, 5-side external push plate, 6-reset spring, 7-transmission rod, 8-internal support rod, 9-rigid stop block, 10-bottom internal support plate, 11-limiting wedge block, 11-1-limiting wedge block a, 11-2-limiting wedge block b, 12-push rod wedge head, 13-internal drive cylinder, 14-bottom side external drive cylinder, 15-bottom side external push plate, a-bottom surface fillet, b-side wall fillet.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
Example 1: the invention is explained by combining the figures 1, 2, 3, 4, 5 and 6, and the invention is a small round angle extrusion forming device of a deep-cavity thin-wall box-shaped component, which comprises an upper bottom plate 1, a base body 2, a side internal supporting plate 3, a side external driving cylinder 4, a side external pushing plate 5, a return spring 6, a transmission rod 7, an internal supporting rod 8, a rigid stop block 9, a bottom internal supporting plate 10, a limit wedge 11, a push rod wedge head 12, an internal driving cylinder 13, a bottom external driving cylinder 14 and a bottom external pushing plate 15;
the method comprises the following steps: as shown in fig. 1, 2, 3, 4, and 5, the upper base plate 1 is initially fixed, and the internal driving cylinder 13 is fixed inside the base body 2 through the base screw hole. The end of the piston rod of the internal driving cylinder 13 is fixed with one end of the transmission rod 7 through a flange, and the other end of the transmission rod 7 is provided with a rigid stop block 9 and a limiting wedge block 11 at specific positions. The bottom internal support plates 10 are then connected together using tie rods below the stop wedges 11. At this time, the mounting of the internal drive cylinder 13 inside the base body 2 is completed, and the piston rod is in an unextended state, and the base body 2 is fixed to the upper slide of the press machine through the upper base plate 1 in preparation for work.
Step two: as shown in fig. 2, 3, 4 and 5, one end of the return spring 6 is fixed on the end surface of the positioning hole on the side surface of the base body 2, and the other end is fixed with the end surface part of the shaft shoulder of the inner support rod 8; one end of the internal support rod 8 is fixedly connected with the internal support plate 3 on the side surface through a flange plate, and the other end of the internal support rod 8 is provided with a push rod wedge 12; the internal support rod 8 penetrates through the reset spring 6 and the positioning hole of the base body 2 and extends into the base body 2 to enable the push rod wedge 12 to be in contact with the connecting rod and achieve limiting. At this time, the installation of the supporting part around the inside of the box-shaped member is completed, and the box-shaped member is in the initial position.
Step three: as shown in fig. 1, 4 and 5, the side external driving cylinders 4 are fixed around, and the axes of the piston rods of the cylinders are collinear with the axis of the internal support rod 8. One end of a piston rod of the side external driving cylinder 4 is fixed with the side external push plate 5 through a flange.
Step four: as shown in fig. 4, 5, 6 and 7, the piston rod of the internal drive cylinder 13 is extended, and the transmission rod 7 moves vertically downward along with the piston rod. The rigid stop 9 at the end of the drive rod, the stop wedge 11, follows the downward movement. The connecting rods and the bottom internal support plate 10 follow the downward extension giving the bottom support to the box. The limiting wedge block 11 is contacted with the push rod wedge head 12 in a vertical surface mode.
Step five: as shown in fig. 4, 5, 6 and 7, one end of the inner support rod 8 is connected to the side inner support plate 3 by a flange. The limiting wedge block 11 moves vertically downwards to push the inner supporting rod 8 to move horizontally outwards under the limiting action of the positioning hole and the return spring 6. Until the rigid stop dog 9 contacts the inner support rod 8 to reach the limit, the reset spring 6 is stretched under the action of tension. At the moment, the four push plates on the side surface are spread to support the inside of the side surface of the box-shaped part.
Step six: as shown in fig. 4, 5 and 6, the piston rod of the side external driving cylinder 4 extends out, and the side external pushing plate 5 moves inwards along with the horizontal movement. The bottom external driving cylinder 14 extends out of the piston rod, and the bottom external push plate 15 moves vertically upwards along with the piston rod. The box-shaped part side is pushed, meanwhile, the inner supporting rod 8 moves inwards horizontally under the thrust of the driving cylinder 4 outside the side, and the return spring 6 contracts to the initial length. The push rod wedge head 12 moves horizontally inwards to push the limiting wedge block 11 to move vertically upwards. The bottom surface internal supporting plate 10 moves vertically upwards, the piston rod of the internal driving air cylinder 8 retracts to the initial position at a constant speed with constant supporting force, and the large round angle of the box-shaped part is reduced by compression.
Step seven: as shown in fig. 4, 5, 6 and 7, the piston rod of the side outer driving cylinder 4 is retracted and the piston rod of the bottom outer driving cylinder 14 is retracted. The side surface outer push plate 5 and the bottom surface outer push plate 15 are separated from the outer surface of the box-shaped part to take the part.
Example two: the description will be made with reference to fig. 4 and 7. In the first step, the limiting wedge block 11 arranged on the rigid stop block 9 is detached and replaced, so that the inside of the box-shaped part is supported on one side. In the partial schematic view of the pushing wedge of fig. 7, a limiting wedge a11-1 is a rectangular limiting block, and a limiting wedge b11-2 is a wedge-shaped limiting block. At this time, when the transmission rod 7 vertically moves downwards, the inner supporting rod 8 on the side of the rectangular limiting block cannot stretch out along with the transmission rod, and the inner supporting rod 8 on the side of the wedge-shaped limiting block can stretch out along with the transmission rod. The limiting blocks shown in fig. 7 are replaced to realize unilateral support inside the box-shaped part, and the rest installation and use steps are the same as those of the first embodiment.
Example three: in the first step, as described with reference to fig. 4 and 7, the limiting wedge 11 mounted on the rigid stopper 9 is replaced to realize asynchronous support inside the opposite side surface of the box-shaped member. In the partial schematic diagrams of the pushing wedge block in fig. 4 and 7, the limiting wedge block is detached and replaced. The inclined plane angles of the limiting wedge block a11-1 and the limiting wedge block b11-2 are set to different angles respectively, so that asynchronous extension of the supporting rod 8 inside the opposite side is realized in the process that the transmission rod 11 moves vertically downwards, and the effect of asynchronous supporting inside the opposite side of the box-shaped part is achieved. The limiting wedge block 11 is arranged on the transmission rod 7, and the rest installation and use steps are the same as those of the first embodiment.
Example four: with reference to fig. 2, 4 and 7, in the third and fifth steps, the side outer pushing plate 5 mounted at one end of the piston rod of the side outer driving cylinder 4 and the side inner supporting plate 3 mounted at one end of the inner supporting rod 8 are detached and replaced, so that the extrusion forming of the special-shaped section of the side wall of the box-shaped part is realized. For the extrusion forming of small fillets of the box-shaped part with the irregular cross section on the periphery, the side surface outer push plate 5 and the side surface inner support plate 3 are adjusted to be irregular cross section plates matched with the cross section shape of the box-shaped part, and the extrusion forming of the irregular cross section of the side wall of the box-shaped part is realized. The rest of the installation and use steps are the same as those of the first embodiment.
Claims (2)
1. A small fillet extruding and forming device for a deep-cavity thin-wall box-shaped component is characterized by comprising an upper bottom plate (1), a base body (2), a side inner supporting plate (3), a side outer driving cylinder (4), a side outer pushing plate (5), a reset spring (6), a transmission rod (7), an inner supporting rod (8), a rigid stop block (9), a bottom inner supporting plate (10), a limiting wedge block (11), a push rod wedge head (12), an inner driving cylinder (13), a bottom outer driving cylinder (14) and a bottom outer pushing plate (15);
the upper bottom plate (1) is used for fixing the base body (2) on the press slide block; the inner driving cylinder (13) is fixed in the base body (2) through bolts; the end part of a piston rod of the internal driving cylinder (13) is fixedly connected with a flange at one end of the transmission rod (7), and the transmission rod (7) moves in the vertical direction along with the piston rod of the internal driving cylinder (13); a rigid stop block (9) is fixed on the side face of the other end of the transmission rod (7) to limit the extending distance of the piston rod;
the bottom surface internal support plate (10) is rigidly connected with the bottom end of the transmission rod (7) through a connecting rod, and the bottom surface internal support plate (10) moves in the vertical direction along with the transmission rod (7); a bottom surface internal support plate (10) and a bottom side external push plate (15) form a gap for placing a component, and the tail end of a piston rod of a bottom side external driving cylinder (14) is connected with the bottom side external push plate (15) through a flange; the limiting wedge block (11) is fixed at the lower part of the rigid stop block (9);
the side inner supporting plate (3) is arranged on the outer side of the periphery of the base body (2), the inner supporting rod (8) penetrates through the base body (2), one end of the inner supporting rod is fixed with the side inner supporting plate (3) through a bolt, and the other end of the inner supporting rod is rigidly fixed with the push rod wedge (12); in the working process, the push rod wedge head (12) is contacted with the wedge surface of the limiting wedge block (11); a piston rod of the internal driving cylinder (13) extends downwards, the transmission rod (7) follows up, the internal supporting plate (10) on the bottom surface extends downwards, the limiting wedge block (11) moves downwards simultaneously, and the periphery of the internal supporting rod (8) is extruded outwards to play an internal supporting role; a gap is formed between the side outer push plate (5) and the side inner support plate (3) for placing a component, and the end flange of the piston rod of the side outer driving cylinder (4) is connected with the side outer push plate (5);
one end of the reset spring (6) is arranged in the mounting hole of the base body (2), and the other end of the reset spring is fixed with the shaft shoulder of the inner support rod (8); the cross section of the contact of the inner supporting rod (8) and the mounting hole of the base body (2) is square, so that the side inner supporting plate (3) is at a correct angle in a vertical plane;
the limiting wedges (11) are arranged in an annular 90-degree angle equidistant array and are connected and fixed with the rigid check blocks (9) into a whole; the angle of the inclined plane of the limiting wedge block (11) is 30-90 degrees, and the limiting wedge block is used for controlling the movement of the internal supporting rod (8) to play a limiting role.
2. The small round corner extrusion forming device for the deep-cavity thin-wall box-shaped component according to claim 1, characterized in that when the return spring (6) is in a non-working state, it is not stressed and is in an initial length, and the internal support rod (8) reaches a limit position; when the inner support function is played, the inner support rod (8) extends outwards, and the reset spring (6) is lengthened under the action of tension; the side surface external driving air cylinder (4) and the bottom surface external driving air cylinder (14) apply force to push inwards, when the internal supporting rod (8) retracts inwards gradually, the reset spring (6) restores to the original length, and the side surface internal push rod reaches the limit again.
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| US6771870B2 (en) * | 2001-03-20 | 2004-08-03 | Eele Laboratories | Components and methods for manufacturing hollow integrators and angle converters |
| CN201565495U (en) * | 2009-11-20 | 2010-09-01 | 天津市谊诚包装制品有限责任公司 | Open drum shaping device |
| CN104368695A (en) * | 2014-11-24 | 2015-02-25 | 常州市永安保安服务有限公司 | U-shaped bending die with shaping function |
| CN105834271B (en) * | 2016-03-31 | 2018-04-10 | 苏州三维精密机械有限公司 | The technique that the constant bull nose of deep drawn bottom of a cup filleted corner reduces |
| CN109201885B (en) * | 2018-09-06 | 2020-04-07 | 安庆美特优智能科技有限公司 | Purlin end punching and shaping device |
| CN211564313U (en) * | 2019-12-31 | 2020-09-25 | 广西石埠乳业有限责任公司 | Box body forming machine |
| CN111822548A (en) * | 2020-06-05 | 2020-10-27 | 北京机电研究所有限公司 | Precise shape control equipment for thin-wall cylinder |
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| 双离合器盘毂冲挤成形中的小圆角填充规律研究;张益雷等;《西北工业大学学报》;20180615(第03期);全文 * |
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