CN206966472U - Positioner and formation system for workpiece to be punched - Google Patents

Abstract

The utility model relates to the technical field of automobile molds, in particular to a positioning device and a forming system for workpieces to be stamped. The positioning device for the workpiece to be punched includes: a positioning mechanism and a lifting mechanism; the positioning mechanism is used to contact the workpiece to be punched; the lifting mechanism is connected with the positioning mechanism and used to drive the positioning mechanism to rise or fall. The utility model provides a positioning device for the workpiece to be stamped. After the workpiece to be stamped is formed, the lifting mechanism drives the positioning mechanism to descend, so as to prevent the positioning mechanism from hindering the user from taking out the formed piece. The user does not have to lift the formed piece more than The height of the positioning mechanism can take out the molded parts, which reduces the waste of actions and improves the production efficiency.

Description

Positioning device and forming system for workpieces to be stamped

technical field

The utility model relates to the technical field of automobile molds, in particular to a positioning device and a forming system for workpieces to be stamped.

Background technique

At present, most of the new models on the market adopt a slip-back shape or a shape with prominent lines and contours. The requirements for the molding of automobile body parts are relatively high, and the complexity of the shape of the parts is increased, which is mainly reflected in the deepening of the parts. In the production process of automobile molds, the sheet material is flat, without ribs, and without rigidity. After the sheet material is placed in the mold cavity and before forming, the sheet material needs to maintain a certain level of flatness, and there will be no phenomenon of stacking, corner bending, and displacement. The positioning device is to lift and limit the position of the material on the edge of the material to prevent the material from stacking, corner bending, and shifting.

In the prior art, a positioning device is used to position the sheet material on the mold. The positioning device in the prior art is a positioning pin, and the positioning pin is fixed at the edge of the lower mold of the mold, and a plurality of positioning pins are arranged at intervals along the circumference of the lower mold. When in use, the sheet material is placed in the cavity of the lower mold, and the edge of the sheet material is in contact with multiple positioning pins, and the multiple positioning pins play a role in limiting the movement of the sheet material in the horizontal direction, thereby preventing the sheet material from forming. in the process of moving in the horizontal direction. However, the positioning device in the prior art needs to take out the formed part from the mold during the manipulator or manual work process after the sheet is formed, and at this time they need to lift the formed part beyond the height of the positioning device to take out the part. It belongs to redundant action waste, which reduces production efficiency to a certain extent.

Utility model content

The purpose of the utility model is to provide a positioning device and a forming system for workpieces to be stamped, so as to solve the technical problem of the difficulty in taking out formed parts in the prior art, resulting in low production efficiency.

The utility model provides a positioning device for workpieces to be punched, the positioning device for workpieces to be punched includes: a positioning mechanism and a lifting mechanism; the positioning mechanism is used to contact the workpiece to be punched; the lifting The mechanism is connected with the positioning mechanism and is used to drive the positioning mechanism to rise or fall.

Further, the positioning mechanism includes a horizontal positioning mechanism, the horizontal positioning mechanism includes a first longitudinal abutment surface, and the first longitudinal abutment surface is used to abut against the edge of the workpiece to be punched, so as to constrain the workpiece to be punched Movement in the horizontal direction; the lifting mechanism is arranged on the side of the first longitudinal abutment surface away from the workpiece to be stamped.

Further, the positioning mechanism also includes a vertical positioning mechanism, the vertical positioning mechanism includes a horizontal positioning plate and an elastic element; the horizontal positioning plate is hinged to the horizontal positioning mechanism, and the upper surface of the horizontal positioning plate is used It abuts against the lower surface of the workpiece to be stamped; one end of the elastic element is connected to the transverse positioning plate, and the other end is connected to the lifting mechanism.

Further, the end of the transverse positioning plate close to the first longitudinal abutment surface is the first end; the upper surface of the first end of the transverse positioning plate is used to abut against the lower surface of the workpiece to be punched; the The second end of the lateral positioning plate opposite to the first end is connected to the elastic element.

Further, the positioning mechanism includes an adjusting plate and a fixing plate; the adjusting plate is fixedly connected with the horizontal positioning mechanism; the fixed plate is fixedly connected with the lifting mechanism; the adjusting plate is movably connected with the fixed plate , to adjust the distance from the first longitudinal abutment surface to the lifting mechanism.

Further, the positioning mechanism is provided with a guide structure for guiding the positioning mechanism to rise or fall.

Further, the guide structure includes a guide rod and a guide hole; the guide hole is set on the positioning mechanism; the guide rod is fixedly connected with the lifting mechanism, and slides through the guide hole.

Further, the utility model also provides a forming system, the forming system includes a stretch forming die and a plurality of positioning devices for workpieces to be stamped according to the present utility model; the stretch forming die includes an upper die and a lower mold; a plurality of positioning devices are sequentially arranged at intervals along the outer periphery of the cavity of the lower mold.

Further, the lower mold is provided with an installation cavity for installing the lifting mechanism; when the workpiece to be stamped is formed, the lifting mechanism drives the positioning mechanism down so that the positioning mechanism is located in the installation cavity.

Further, the molding system also includes a press; the lifting mechanism is electrically connected to the control system of the press;

When the press presses the sheet material downward, the control system controls the lifting mechanism to drive the positioning mechanism to move upward, so that the positioning mechanism is in a working state;

When the pressing machine completes the pressing upward movement, the control system controls the lifting mechanism to drive the positioning mechanism to move downward, so that the positioning mechanism is in a failure state.

The positioning device for workpieces to be stamped provided by the utility model includes a positioning mechanism and a lifting mechanism connected with the positioning mechanism. The user arranges a plurality of positioning devices around the cavity of the mold. When the workpiece to be stamped is processed and formed, the positioning mechanism positions the workpiece to be stamped to prevent the workpiece to be stamped from moving during the stamping process. After punching and forming, the lifting mechanism drives the positioning mechanism to descend, so that the positioning mechanism is lower than the height of the formed part. At this time, the positioning mechanism does not have a positioning function, and the user takes out the formed part. Then, the lifting mechanism drives the positioning mechanism to rise to the preset position, and the user puts the workpiece to be stamped into the mold, and the positioning mechanism plays a role in positioning the workpiece to be stamped, and the stamping and forming are performed in sequence.

The utility model provides a positioning device for a workpiece to be stamped. After the workpiece to be stamped is formed, the lifting mechanism drives the positioning mechanism to descend, so as to avoid the positioning mechanism from hindering the user from taking out the molded piece, and the user does not have to lift the molded piece more than The height of the positioning mechanism can take out the molded parts, which reduces the waste of actions and improves the production efficiency.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 is the front view of the positioning device for the workpiece to be stamped provided by the embodiment of the utility model;

Fig. 2 is a perspective view of the positioning device for the workpiece to be stamped shown in Fig. 1;

Fig. 3 is a top view of the positioning device for the workpiece to be stamped shown in Fig. 1;

Fig. 4 is a right side view of the positioning device for the workpiece to be stamped shown in Fig. 1 .

Reference signs:

1-lifting mechanism; 2-positioning mechanism; 3-guide rod;

11-cylinder; 21-horizontal positioning mechanism; 22-vertical positioning mechanism;

23-adjusting plate; 24-fixing plate; 25-installing plate;

111-piston rod; 211-locating pin; 221-transverse positioning plate;

222 - Elastic element.

Detailed ways

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Fig. 1 is the front view of the positioning device for the workpiece to be stamped provided by the embodiment of the utility model; Fig. 2 is a perspective view of the positioning device for the workpiece to be punched shown in Fig. 1; Fig. 3 is the positioning device shown in Fig. 1 A top view of the positioning device for the workpiece to be stamped; Figure 4 is a right view of the positioning device for the workpiece to be stamped shown in Figure 1; The positioning device for the workpiece to be punched, the positioning device for the workpiece to be punched includes: a positioning mechanism 2 and a lifting mechanism 1; the positioning mechanism 2 is used to contact the workpiece to be punched; the lifting mechanism 1 is connected to the positioning mechanism 2 for driving The positioning mechanism 2 rises or falls.

The positioning device for the workpiece to be punched provided by the embodiment of the utility model includes a positioning mechanism 2 and a lifting mechanism 1 connected with the positioning mechanism 2 . The user arranges a plurality of positioning devices around the cavity of the mold. When the workpiece to be punched is processed and formed, the positioning mechanism 2 positions the workpiece to be punched to prevent the workpiece to be punched from moving during the stamping process. After punching and forming, the lifting mechanism 1 drives the positioning mechanism 2 to descend, so that the positioning mechanism 2 is lower than the height of the molding. At this time, the positioning mechanism 2 does not have a positioning effect, and the user takes out the molding. Then, the lifting mechanism 1 drives the positioning mechanism 2 to rise to the preset position. The user puts the workpiece to be stamped into the mold, and the positioning mechanism 2 plays a role in positioning the workpiece to be stamped, and the stamping and forming are performed in a cycle.

The positioning device for the workpiece to be stamped provided by the embodiment of the utility model, after the workpiece to be stamped is formed, the lifting mechanism 1 drives the positioning mechanism 2 to descend, so as to prevent the positioning mechanism 2 from hindering the user from taking out the formed piece, and the user does not have to move the The molded piece can be taken out when the molded piece is lifted beyond the height of the positioning mechanism 2, which reduces the waste of actions and improves the production efficiency.

Wherein, the structural forms of the positioning mechanism 2 can be various. For example, the positioning mechanism 2 is a vertical positioning plate, and a groove with an arc-shaped cross section is arranged on the positioning plate. The workpiece to be punched is placed in the groove and abuts against the bottom wall of the groove, and the bottom wall of the groove restricts the movement of the workpiece to be punched in the horizontal direction. The arc shape of the groove can prevent the workpiece to be stamped from being stuck in the groove. When the press acts on the workpiece to be stamped, the workpiece to be stamped can fall out of the groove, thereby facilitating the removal of the formed part from the groove.

The lifting mechanism 1 can be an air cylinder 11, a hydraulic cylinder or the like.

As shown in Figures 1 to 4, on the basis of the above embodiments, further, the positioning mechanism 2 includes a horizontal positioning mechanism 21, and the horizontal positioning mechanism 21 includes a first longitudinal abutment surface, the first longitudinal abutment surface is used for The edges of the workpiece to be punched are abutted to constrain the movement of the workpiece to be punched in the horizontal direction; the lifting mechanism 1 is arranged on the side of the first longitudinal abutment surface away from the workpiece to be punched.

In this embodiment, when in use, the user places the workpiece to be punched between a plurality of first longitudinal abutment surfaces, the side walls of the workpiece to be punched abut against the plurality of first longitudinal abutment surfaces, and the plurality of first longitudinal abutment surfaces The longitudinal abutment surface acts on the workpiece to be stamped, thereby constraining the movement of the workpiece to be stamped in the horizontal direction.

In this embodiment, the lifting mechanism 1 is arranged on the side of the first longitudinal abutment surface away from the workpiece to be punched, that is, the workpiece to be punched and the lifting mechanism 1 are respectively located on both sides of the first longitudinal abutment surface, which can avoid lifting Mechanism 1 hinders the ascent and descent of positioning mechanism 2.

Wherein, the positioning mechanism 2 can be a vertical positioning pin 211, the positioning pin 211 is connected with the lifting mechanism 1, and the lifting mechanism 1 drives the positioning pin 211 to move up and down.

As shown in Figures 1 to 4, on the basis of the foregoing embodiments, further, the positioning mechanism 2 also includes a vertical positioning mechanism 22, and the vertical positioning mechanism 22 includes a lateral positioning plate 221 and an elastic element 222; the lateral positioning plate 221 Hinged with the horizontal positioning mechanism 21, the upper surface of the lateral positioning plate 221 is used to abut against the lower surface of the workpiece to be punched; one end of the elastic element 222 is connected to the lateral positioning plate 221, and the other end is connected to the lifting mechanism 1.

In this embodiment, the user places the workpiece to be stamped on the transverse positioning plate 221 , the press applies a downward force to the workpiece to be stamped, the transverse positioning plate 221 rotates downward relative to the horizontal positioning mechanism 21 , and the elastic element 222 generates elastic force. When the molded workpiece slides from the transverse positioning plate 221 into the lower mold, the elastic force of the elastic element 222 drives the transverse positioning plate 221 to rotate in the opposite direction, so that the transverse positioning plate 221 returns to its original position.

In this embodiment, the lateral positioning plate 221 supports the workpiece to be punched, so that the workpiece to be punched is balanced in the vertical direction, so as to prevent the workpiece to be punched from being tilted once when it is subjected to the force of the press, that is, to prevent The shaking of the workpiece to be stamped in the vertical direction makes the workpiece to be stamped more stable.

Wherein, the elastic element 222 can be disposed on a side close to the positioning mechanism 2 and close to the first longitudinal abutment surface, that is, the workpiece to be stamped and the elastic element 222 are located on the same side of the first longitudinal abutment surface. The elastic element 222 can be arranged on the upper end of the transverse positioning plate 221 or on the lower end of the transverse positioning plate 221 .

Further, one side of the locating pin 211 is milled flat, and the locating pin 211 is provided with a mounting hole, and the lateral positioning plate 221 is penetrated in the mounting hole, and is rotatably connected with the lateral positioning plate 221 by a pin shaft, thereby facilitating the installation of the lateral positioning plate 221. Install.

As shown in Figures 1 to 4, on the basis of the above embodiments, further, the end of the transverse positioning plate 221 close to the first longitudinal abutment surface is the first end; the upper surface of the first end of the transverse positioning plate 221 is used The second end of the transverse positioning plate 221 opposite to the first end is connected with the elastic element 222 .

In this embodiment, the first end of the transverse positioning plate 221 is used to place the workpiece to be punched, and the second end is connected to the elastic element 222, that is, the elastic element 222 is located on both sides of the positioning mechanism 2, so that the elastic element can 222 is far away from the position of the workpiece to be stamped, so as to prevent the elastic element 222 from obstructing the placement of the stamped piece.

As shown in Figures 1 to 4, on the basis of the above-mentioned embodiments, further, the positioning mechanism 2 includes an adjusting plate 23 and a fixed plate 24; the adjusting plate 23 is fixedly connected with the horizontal positioning mechanism 21; Fixed connection; the adjusting plate 23 is movably connected with the fixing plate 24 to adjust the distance from the first longitudinal contact surface to the lifting mechanism 1 .

In this embodiment, the adjusting plate 23 is fixedly connected with the horizontal positioning mechanism 21 , and the fixed plate 24 is connected with the lifting mechanism 1 . When it is necessary to adjust the distance between the first longitudinal abutment surface of the horizontal positioning mechanism 21 and the lifting mechanism 1, the user can move the adjustment plate 23 relative to the fixed plate 24 to adjust the relative position of the adjustment plate 23 and the fixed plate 24, thereby realizing the first A distance from the longitudinal abutment surface to the lifting mechanism 1 .

In this embodiment, the distance between the first longitudinal abutment surface and the lifting mechanism 1 is set to be adjustable, which facilitates the user to adjust the position of the horizontal positioning mechanism 21 according to needs, and improves the applicability of the positioning device.

Among them, an upper threaded hole can be set on the adjusting plate 23, and a plurality of lower threaded holes can be set on the fixing plate 24. The user can match the upper threaded hole with the corresponding lower threaded hole and then use bolts to fix the adjusting plate 23 and the fixing plate 24. , so as to realize the adjustment of the distance between the two.

Further, a slider can be set on the adjustment plate 23, a chute can be set on the fixed plate 24, the slider is slid in the chute, and the user moves the slider of the adjustment plate 23 in the chute, thereby realizing the distance between the two. adjustment.

As shown in FIG. 1 to FIG. 4 , on the basis of the above embodiments, further, the positioning mechanism 2 is provided with a guide structure for guiding the positioning mechanism 2 to rise or fall.

In this embodiment, when the lifting mechanism 1 drives the positioning mechanism 2 to move up and down, the guide structure plays the role of guiding the positioning mechanism 2, thereby preventing the positioning mechanism 2 from shaking during the up and down movement, so that the positioning mechanism 2 is moving more stable in the process.

Wherein, the structural forms of the guide structure can be various, for example, the guide structure includes a guide groove and a guide block, the guide block is slidably arranged in the guide groove, and the two cooperate to guide the positioning mechanism 2 to rise and fall.

As shown in Figures 1 to 4, on the basis of the above embodiments, further, the guide structure includes a guide rod 3 and a guide hole; the guide hole is arranged on the positioning mechanism 2; the guide rod 3 is fixedly connected with the lifting mechanism 1, and Sliding is installed in the guide hole.

In this embodiment, the guiding structure includes a guiding rod 3 and a guiding hole, and the guiding effect on the positioning mechanism 2 is realized through the cooperation of the hole and the rod, which is simple in structure and convenient for processing and manufacturing.

Wherein, the lifting mechanism 1 is an air cylinder 11, and the positioning mechanism 2 includes a mounting plate 25 on which guide holes are arranged, and the mounting plate 25 is used to be installed on the mould. The fixed plate 24 is fixedly connected with the piston rod 111 of the cylinder 11 , and the guide rod 3 is fixedly connected with the fixed plate 24 . When the piston rod 111 of the cylinder 11 drives the positioning mechanism 2 to move upward, the guide rod 3 moves in the guide hole, thereby realizing the guiding function.

Further, a waist-shaped hole can be set on the adjustment plate 23, and the upper end of the guide rod 3 is passed through the waist-shaped hole. When the relative position of the adjustment plate 23 and the fixed plate 24 needs to be adjusted, the adjustment plate 23 is moved relative to the fixed plate 24. , The guide rod 3 moves in the waist-shaped hole, so it is not necessary to remove the adjustment plate 23 from the fixed plate 24 for adjustment, which is convenient to use.

On the basis of the above-mentioned embodiments, further, the embodiment of the present utility model also provides a forming system, the forming system includes a stretch forming die and a plurality of positioning devices for workpieces to be punched according to the present utility model; The forming mold includes an upper mold and a lower mold; a plurality of positioning devices are sequentially arranged at intervals along the outer periphery of the cavity of the lower mold.

In the molding system provided by this embodiment, a plurality of positioning devices are arranged at intervals along the outer periphery of the cavity of the lower mold. move in the process. After punching and forming, the lifting mechanism 1 drives the positioning mechanism 2 to descend, so that the positioning mechanism 2 is lower than the height of the molding. At this time, the positioning mechanism 2 does not have a positioning effect, and the user takes out the molding. Then, the lifting mechanism 1 drives the positioning mechanism 2 to rise to the preset position. The user puts the workpiece to be stamped into the mold, and the positioning mechanism 2 plays a role in positioning the workpiece to be stamped, and the stamping and forming are performed in a cycle.

In the molding system provided in this embodiment, after the workpiece to be stamped is formed, the lifting mechanism 1 drives the positioning mechanism 2 to descend, so as to prevent the positioning mechanism 2 from hindering the user from taking out the molding, and the user does not have to lift the molding beyond the positioning mechanism The molded parts can be taken out at a height of 2, which reduces waste of action and improves production efficiency.

Wherein, a mounting table can be set at the edge of the lower die, and each positioning device is installed on the mounting table.

Preferably, there are six positioning devices, and two positioning devices are arranged on each side of the lower mold.

On the basis of the above embodiments, further, the lower mold is provided with an installation cavity for installing the lifting mechanism 1; when the workpiece to be stamped is formed, the lifting mechanism 1 drives the positioning mechanism 2 down so that the positioning mechanism 2 is located in the installation cavity.

In this embodiment, an installation cavity is set on the lower mold, and when the positioning mechanism 2 does not need to be positioned, the lifting mechanism 1 drives the positioning mechanism 2 to descend, so that the positioning mechanism 2 is located in the installation cavity, so that the height of the positioning mechanism 2 can be reduced to the greatest extent. , so that it is more convenient to take out the formed workpiece.

On the basis of the above embodiments, further, the forming system further includes a press; the lifting mechanism 1 is electrically connected to the control system of the press; when the press presses the sheet material downward, the control system controls the lifting mechanism 1 to drive the positioning mechanism 2 Move upwards so that the positioning mechanism 2 is in a working state; when the press completes pressing the upward movement, the control system controls the lifting mechanism 1 to drive the positioning mechanism 2 to move downwards, so that the positioning mechanism 2 is in an invalid state.

In this embodiment, the lifting mechanism 1 is electrically connected with the control system of the press. When the press presses the sheet material downward, the control system controls the lifting mechanism 1 to drive the positioning mechanism 2 to move upward, so that the positioning mechanism 2 is in a working state. The workpiece to be punched is placed in the cavity, and the positioning mechanism 2 plays a role in positioning the workpiece to be punched. After the press machine forms the workpiece to be stamped, the press machine completes the pressing upward movement, and the control system controls the lifting mechanism 1 to drive the positioning mechanism 2 to move downward, so that the positioning mechanism 2 is in an invalid state, that is, the positioning mechanism 2 does not function as a positioning function. This prevents the positioning mechanism 2 from hindering the removal of the molded part. After the user takes out the molded part, the control system of the press controls the lifting mechanism 1 to raise the positioning mechanism 2, so that the positioning mechanism 2 is in a working state, and is recycled in sequence.

In this embodiment, the linkage and cooperation between the press machine and the lifting mechanism 1 can realize automatic control of the positioning device during stamping and forming, which is convenient to use and improves work efficiency.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the various embodiments of the present invention Scope of technical solutions.

Claims (10)

1. A positioning device for a workpiece to be stamped, comprising: a positioning mechanism (2) and a lifting mechanism (1); The positioning mechanism (2) is used to abut against the workpiece to be stamped; the lifting mechanism (1) is connected to the positioning mechanism (2) and used to drive the positioning mechanism (2) to rise or fall. 2. The positioning device for workpieces to be stamped according to claim 1, characterized in that, the positioning mechanism (2) comprises a horizontal positioning mechanism (21), and the horizontal positioning mechanism (21) comprises a first longitudinal stop A contact surface, the first longitudinal abutment surface is used to abut against the edge of the workpiece to be stamped, so as to restrict the movement of the workpiece to be stamped in the horizontal direction; The lifting mechanism (1) is arranged on a side of the first longitudinal abutment surface away from the workpiece to be stamped. 3. The positioning device for workpieces to be stamped according to claim 2, characterized in that, the positioning mechanism (2) also includes a vertical positioning mechanism (22), and the vertical positioning mechanism (22) includes a transverse Positioning plate (221) and elastic element (222); The horizontal positioning plate (221) is hinged with the horizontal positioning mechanism (21), and the upper surface of the horizontal positioning plate (221) is used to abut against the lower surface of the workpiece to be stamped; the elastic element (222) One end is connected with the transverse positioning plate (221), and the other end is connected with the lifting mechanism (1). 4. The positioning device for workpieces to be stamped according to claim 3, characterized in that, the end of the lateral positioning plate (221) close to the first longitudinal abutment surface is the first end; the lateral positioning The upper surface of the first end of the plate (221) is used to abut against the lower surface of the workpiece to be stamped; the second end of the lateral positioning plate (221) opposite to the first end is in contact with the elastic element (222) connect. 5. The positioning device for workpieces to be punched according to claim 2, characterized in that, the positioning mechanism (2) comprises an adjusting plate (23) and a fixing plate (24); The adjusting plate (23) is fixedly connected with the horizontal positioning mechanism (21); the fixed plate (24) is fixedly connected with the lifting mechanism (1); the adjusting plate (23) is fixedly connected with the fixed plate ( 24) Flexible connection to adjust the distance from the first longitudinal abutment surface to the lifting mechanism (1). 6. The positioning device for workpieces to be stamped according to claim 1, characterized in that, the positioning mechanism (2) is provided with a guide structure for guiding the positioning mechanism (2) to rise or fall. 7. The positioning device for workpieces to be punched according to claim 6, characterized in that, the guide structure comprises a guide rod (3) and a guide hole; The guide hole is arranged on the positioning mechanism (2); the guide rod (3) is fixedly connected with the lifting mechanism (1), and slides through the guide hole. 8. A forming system, characterized in that it comprises a stretch forming die and a plurality of positioning devices for workpieces to be stamped according to any one of claims 1-7; The stretch forming mold includes an upper mold and a lower mold; a plurality of positioning devices are sequentially arranged at intervals along the outer periphery of the cavity of the lower mold. 9. The forming system according to claim 8, characterized in that, the lower mold is provided with an installation cavity for installing the lifting mechanism (1); After the workpiece to be stamped is formed, the lifting mechanism (1) drives the positioning mechanism (2) down so that the positioning mechanism (2) is located in the installation cavity. 10. The forming system according to claim 8, further comprising a press; The lifting mechanism (1) is electrically connected to the control system of the press; When the press presses the sheet material downward, the control system controls the lifting mechanism (1) to drive the positioning mechanism (2) to move upward, so that the positioning mechanism (2) is in a working state; When the pressing machine completes the pressing upward movement, the control system controls the lifting mechanism (1) to drive the positioning mechanism (2) to move downward, so that the positioning mechanism (2) is in a failure state.