A holding plate for preventing deformation of hot-formed parts during blanking

Abstract

The present invention relates to a pressing plate for preventing deformation of a hot-formed part during blanking, comprising a lower mold and a punch insert arranged in the middle of the lower mold, a lower pressing plate is arranged on the lower mold on one side of the punch insert, a plurality of nitrogen springs are arranged below the lower pressing plate, and a plurality of locking mechanisms are arranged above the lower pressing plate; the present invention replaces the expensive and complicated delay nitrogen springs with ordinary nitrogen springs, thereby eliminating the delay nitrogen springs in the usual solution as the pressure source of the lower pressing plate, and adopts a locking mechanism to solve the demand for the delay function, thereby completely solving the problem of part deformation caused by the interaction between the upper and lower pressing plates while ensuring safe production.

Description

Technical Field

[0001] The invention belongs to the field of automobile trial-produced hot forming samples, in particular to the field of a pressing plate for preventing deformation of a B-pillar hot forming part during blanking. Background Art

[0002] At present, in the field of automobile trial hot forming sample development, the stamping forming of B-pillar hot forming parts is a major difficulty; the B-pillar hot forming parts have a complex configuration, and their mold structure is much more complicated than that of ordinary hot forming molds. Usually, the B-pillar hot forming process needs to be completed by upper and lower pressing methods; to ensure the quality of the parts, the upper and lower pressure sources must be provided by nitrogen springs; after the parts are formed in the mold, during the process of opening the mold to take out the parts, the part of the upper pressing plate that has not separated from the part body will always exert downward pressure on the formed product parts through the nitrogen spring, and at this time, the downward pressure source must use a delayed nitrogen spring to prevent the lower pressing plate from exerting an upward thrust on the parts, so as to prevent the formed parts from being adversely deformed. When the return nitrogen spring of the upper pressing plate completely releases its stroke, the upper pressing plate continues to rise along with the slider on the machine tool and completely leaves the plate, and the lower delay nitrogen spring starts to work and returns to its initial state. Although the principle of this process is simple, it requires the purchase of special nitrogen springs with a delay function, and this type of nitrogen spring must be connected in series by the nitrogen spring sales manufacturer on site. The price of this delay nitrogen spring is more than 8 times that of an ordinary nitrogen spring. Not only is the mold development cost high, but it also extends the development cycle. It takes nearly 2 weeks to connect the nitrogen springs in series alone. Summary of the invention

[0003] In order to solve the above problems, the present invention achieves the above objectives through the following technical solutions:

[0004] A pressing plate for preventing deformation of a hot-formed part during blanking comprises a lower mold and a punch insert arranged in the middle of the lower mold, a lower pressing plate is arranged on the lower mold on one side of the punch insert, a plurality of nitrogen springs are arranged below the lower pressing plate, and a plurality of locking mechanisms are arranged above the lower pressing plate.

[0005] As a further optimization scheme of the present invention, the locking mechanism includes a cover plate and double screws arranged on the cover plate, one end of the cover plate is fixed to the end of one side of the mold by the double screws, and the other side of the cover plate extends to the top of the lower pressing plate.

[0006] As a further optimization scheme of the present invention, the locking mechanism includes a rotating plate and a rotating pin arranged on the rotating plate, one end of the rotating plate is fixed to the end portion of one side of the lower mold through the rotating pin, and the other side of the rotating plate extends to the top of the lower pressing plate, and the rotating plate rotates along the axis of the rotating pin.

[0007] As a further optimization scheme of the present invention, the locking mechanism includes a fixing seat fixed on one side of the mold, a side pin is embedded in the fixing seat, the side pin is cylindrical, and an annular groove is provided near the outer end; a clamping plate base is fixed on the fixing seat above the side pin, a rotating shaft passes through the clamping plate base, a groove is vertically provided on a side surface of the clamping plate base close to the fixing seat, a side pin clamping plate is provided in the groove, the upper part of the side pin clamping plate is fixedly connected to one end of the rotating shaft, and the bottom is embedded in the annular groove, and a rotating handle is provided at the other end of the rotating shaft.

[0008] As a further optimization solution of the present invention, fastening screws are symmetrically provided at both ends of the clamping plate base, and the clamping plate base is fixed on the fixing seat by the fastening screws.

[0009] As a further optimization solution of the present invention, the axis of the rotating shaft and the axis of the side pin are eccentrically arranged and are not on the same vertical line.

[0010] The beneficial effects of the present invention are:

[0011] 1) In the present invention, the expensive and complicated installation time-delay nitrogen spring is replaced with a common nitrogen spring, so that the pressure source of the lower pressing plate eliminates the time-delay nitrogen spring in the usual solution, and a locking mechanism is used to solve the need for the time-delay function, which completely solves the problem of part deformation caused by the interaction between the upper and lower pressing plates while ensuring safe production;

[0012] 2) The above structure can not only eliminate the delayed nitrogen spring, reduce the mold investment cost, but also ensure the part trial production cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the position between the workpiece and the upper and lower pressing plates of the present invention;

[0014] Figure 2 is a schematic structural diagram of Embodiment 1 of the present invention;

[0015] Figure 3 The present invention Figure 2 A local enlarged schematic diagram of the middle A;

[0016] Figure 4 It is a structural schematic diagram of Example 2 of the present invention;

[0017] Figure 5 The present invention Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0018] Figure 6 The three-dimensional structure of Example 3 of the present invention is shown in FIG. Figure 1 ;

[0019] Figure 7 The three-dimensional structure of Example 3 of the present invention is shown in FIG. Figure 2 ;

[0020] Figure 8 is a three-dimensional schematic diagram of a locking mechanism in Embodiment 3 of the present invention;

[0021] Fig. 9 is a schematic cross-sectional structural diagram of the locking mechanism and the lower pressing plate in Example 3 of the present invention;

[0022] In the figure: A, upper pressing area; B, lower pressing area; 1, lower mold; 11, punch insert; 12, lower pressing plate; 13, workpiece; 2, locking mechanism; 3, cover plate; 31, double screws; 4, rotating plate; 41, rotating pin; 5, fixing seat; 51, side pin; 511, annular groove; 6, clamping plate base; 61, rotating shaft; 62, groove; 63, side pin clamping plate; 64, rotating handle; 65, fastening screw. DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0024] Example 1

[0025] like Figures 1 to 3 A press plate for preventing deformation during blanking of a hot-formed part is shown, comprising a lower mold 1, a punch insert 11 arranged in the middle of the lower mold 1, a workpiece 13 is covered on the punch insert, a lower press plate 12 is arranged on the lower mold 1 on one side of the punch insert 11, a plurality of nitrogen springs are arranged below the lower press plate 12, and a plurality of locking mechanisms 2 are arranged above the lower press plate 12; wherein the locking mechanism 2 comprises a cover plate 3, and double screws 31 arranged on the cover plate 3, one end of the cover plate 3 is fixed to the end of one side of the lower mold 1 by the double screws 31, and the other side of the cover plate 3 extends to the top of the lower press plate 12;

[0026] When in use, the pressure source of the upper pressing plate continues to use ordinary nitrogen springs as in the usual scheme, while the lower pressure source is changed to ordinary nitrogen springs as the pressure source. When the mold is formed to the bottom, it can be manually locked by using double screws on the two cover plates. The cover plates can limit the pressure on the lower pressing plate, thereby preventing the lower pressing plate from exerting an upward thrust on the parts and preventing the formed parts from causing adverse deformation. This design has a simple structure, eliminates the delayed nitrogen spring, saves costs, and saves production cycles.

[0027] Example 2

[0028] According to the structure of the above-mentioned embodiment 1, it is known that the manual locking operation needs to be realized through the joint action of two screws and the cover plate. After the locking is completed, it needs to be disassembled as soon as possible, which slows down the production cycle. Therefore, if Figure 4 , Figure 5 As shown, the structure of the locking mechanism 2 is changed on the basis of the structure of the embodiment 1, wherein the locking mechanism 2 of the embodiment includes a rotating pin plate, a rotating pin 41 provided on the rotating plate 4, and one end of the rotating plate 4 is fixed to one end of the lower mold 1 through the rotating pin 41, and the other side of the rotating plate 4 extends to the top of the lower pressing plate 12, and the rotating plate 4 rotates along the axis of the rotating pin 41;

[0029] When in use, the upper pressing plate pressure source continues to use an ordinary nitrogen spring as the usual solution, and the lower pressure source is changed to an ordinary nitrogen spring as the pressure source. After the mold is formed to the bottom, the lower pressure source is manually locked by the action of the set rotating plate and pin. At the same time, it can be fixed by a screw. In this way, the rotating plate can be manually rotated around the rotating pin to lock it during locking, thereby preventing the lower pressing plate from exerting an upward thrust on the part and preventing the formed part from causing adverse deformation. Compared with the technical solution of Example 1, this design can reduce the manual repeated locking operation of at least one screw, and also cancels the delayed nitrogen spring, which can save costs and production cycle.

[0030] Example 3

[0031] Furthermore, since the technical solution of Example 2 adopts a structure of a rotating plate and a rotating pin, it can be fixed by at most one screw. Compared with Example 1, such a structure has a reduced locking force and has certain safety hazards; therefore, if Figures 6 to 9As shown, based on the structure of Example 1, the structure of the locking mechanism 2 is changed, wherein the locking mechanism 2 includes a fixing seat 5 fixed to one side of the mold, a side pin 51 and a clamping plate base 6 arranged above the side pin 51 are embedded on the fixing seat 5, the side pin 51 is cylindrical, and an annular groove 511 is provided near the outer end; the side pin 51 is mainly used to control the stroke of the pressing core during operation. It should be noted here that a circular hole is provided on the side wall of the lower pressing plate 12 near the fixing seat. When locking is required, the end of the side pin will be embedded in the circular hole to achieve the locking effect; the clamping plate base The two ends of the clamping plate 6 are symmetrically provided with fastening screws 65, and the clamping plate base 6 is fixed on the fixing seat 5 by the fastening screws 65. A rotating shaft 61 is penetrated through the clamping plate base 6, and a groove 62 is vertically provided on a side surface of the clamping plate base 6 close to the fixing seat, so that the transverse section of the clamping plate base is concave, and a side pin clamping plate 63 is provided in the groove 62. The upper part of the side pin clamping plate 63 is fixedly connected with one end of the rotating shaft 61, and the bottom is embedded in the annular groove 511. A rotating handle 64 is provided at the other end of the rotating shaft 61; at the same time, the axis of the rotating shaft 61 and the axis of the side pin 51 are eccentrically arranged, and the two axis center lines are not on the same vertical line;

[0032] When in use, the pressure source of the upper pressing plate is the same as that of the usual scheme, and still adopts an ordinary nitrogen spring. The pressure source of the lower pressing plate cancels the delayed nitrogen spring in the usual scheme, and adopts a side pin locking structure to replace the cover plate or rotating plate in the scheme of Example 1 or Example 2. After the mold is formed, the rotation of the rotating handle drives the rotation of the rotating shaft, and at the same time, the end of the side pin 51 is pushed into the circular hole of the lower plate 12, so that the lower end of the side pin clamp is embedded in the annular groove. Under the limiting effect of the front and rear side walls of the annular groove, the position of the side pin is just limited; thereby preventing the lower pressing plate from exerting an upward thrust on the parts, and preventing the formed parts from being adversely deformed; compared with Examples 1 and 2, such a design is simpler to operate and more reliable in structure. While ensuring safe production, it completely solves the problem of part deformation caused by the interaction between the upper and lower pressing plates, which can not only cancel the delayed nitrogen spring and reduce the mold investment cost, but also ensure the part trial production cycle.

[0033] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A holding plate for preventing deformation of a thermoformed part during blanking, characterized in that: It comprises a lower mold (1), a punch insert (11) arranged in the middle of the lower mold (1), the punch insert being covered with a workpiece (13), a lower pressing plate (12) being arranged on the lower mold (1) on one side of the punch insert (11), a plurality of nitrogen springs being arranged below the lower pressing plate (12), and a plurality of locking mechanisms (2) being arranged above the lower pressing plate (12); The locking mechanism (2) comprises a fixing seat (5) fixedly arranged on one side of the lower mold (1), a side pin (51) being embedded in the fixing seat (5), the side pin (51) being cylindrical and having an annular groove (511) at a position close to the outer end thereof; a cardboard base (6) being arranged on the fixing seat (5) above the side pin (51), a rotating shaft (61) being passed through the cardboard base (6), a groove (62) being vertically arranged on a side surface of the cardboard base (6) close to the fixing seat, a side pin cardboard (63) being arranged in the groove (62), the upper part of the side pin cardboard (63) being fixedly connected to one end of the rotating shaft (61), the bottom part being embedded in the annular groove (511), and the other end of the rotating shaft (61) being provided with a rotating handle (64); The axis of the rotating shaft (61) and the axis of the side pin (51) are eccentrically arranged, and the two axes are not on the same vertical line.

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