CN112974601A - Punch forming die for reinforcing plate sectional forming process - Google Patents

Abstract

Vehicle left and right reinforcing plate stamping forming mould. Relates to a stamping die for a product which is easy to be distorted and deformed after being formed. The stress condition of the plate blank can be changed in the processing process, so that the distortion resilience amount can be reduced to the maximum extent, and the adjustment is convenient. The die comprises an upper die and a lower die, wherein a punch on the upper die and a lower die forming block on the lower die are respectively provided with a pair of punches which are symmetrically arranged relative to the central lines of the upper die and the lower die; the lower die forming block comprises an inner side insert group, an outer side insert group and a material supporting core, wherein the inner side surfaces of the inner side insert group and the outer side insert group and the top surface of the material supporting core form a die cavity which is integrally arched and has a U-shaped section; the inner insert group and the outer insert group are formed by splicing a plurality of inserts in a segmented manner in the length direction, and are fixedly connected on the lower die base; the material supporting core is movably connected to the lower die base, and the bottom surface of the material supporting core is contacted with a machine tool ejector rod; the upper edge openings of the two sides of the cavity are respectively provided with a positioner. The precision and the qualification rate of the product are improved.

Description

Punch forming die for reinforcing plate sectional forming process

Technical Field

The invention relates to a plate forming die, in particular to a punch forming die for a reinforced plate sectional forming process.

Background

The press forming is a processing and forming method for obtaining a workpiece (stamping part) with a required shape and size by applying an external force to a plate, a strip, a pipe, a section bar and the like by a press machine and a die to cause plastic deformation or separation. The stamped blanks are mainly hot and cold rolled steel sheets and strips. In the world, 60-70% of steel materials are plates, and most of the plates are punched to form finished products. The body, chassis, oil tank, radiator sheet, boiler steam drum, shell of container, iron core silicon steel sheet of motor and electric appliance are all made by punching. The reinforcing plates of the left and right side beams of the vehicle are finished by stamping, and are arched (arched) with U-shaped flanges in cross section. Such parts are prone to torsional springback after stamping. The torsional rebound is the rebound which is not a single section, and meanwhile, the torsional deformation in the length direction also exists.

Because the automobile parts have high requirements on precision and quality, in order to avoid the above situations, the processing technology generally adopted in the field for the parts is as follows: drawing, trimming, punching and flanging and shaping, and the process has the advantages of low product breakage rate and high section precision. But the distortion deformation in the length direction is difficult to eliminate, and the adjustment through the die size is very difficult, because the drawing springback compensation is not simple, but the compensation is more or less, and the adjustment is difficult until the finished piece is qualified. The product is analyzed to find that the arc shape is not a regular circular arc curve, but the section shape is constant, and the radian of each section is different. A 'material pressing edge' is reserved for the plate blank in the drawing process, and the pressure borne by the 'material pressing edge' is the same, so that the internal stress at each position is inconsistent, and the torsion springback in the length direction occurs.

Disclosure of Invention

Aiming at the problems, the invention provides the punch forming die for the vehicle left and right reinforcing plate segmented forming process, which can change the condition that the plate blank is uniformly stressed in the processing process, further reduce the distortion rebound quantity to the maximum extent and facilitate the adjustment.

The technical scheme of the invention is as follows: the reinforcing plates of the left side beam and the right side beam of the vehicle are integrally arched, the cross section of each reinforcing plate is U-shaped, the die comprises an upper die and a lower die, the upper die comprises an upper die base and a punch, the lower die comprises a lower die base, a lower die forming block and a machine tool ejector rod, the punch on the upper die and the lower die forming block on the lower die are respectively provided with a pair and are symmetrically arranged relative to the central lines of the upper die and the lower die; the lower die forming block comprises an inner side insert group, an outer side insert group and a material supporting core, wherein the inner side surfaces of the inner side insert group and the outer side insert group and the top surface of the material supporting core form a die cavity which is integrally arched and has a U-shaped section; the inner insert group and the outer insert group are formed by splicing a plurality of inserts in a segmented manner in the length direction, and are fixedly connected to the lower die seat; the material supporting core is movably connected to the lower die base, and the bottom surface of the material supporting core is contacted with the machine tool ejector rod; and positioners are respectively arranged at the upper edge ports at the two sides of the cavity.

And a solid block for limiting the downward stroke of the material supporting core is also arranged on the lower die base.

The invention segments the product, processes the distortion rebound by segmentation, and leads the adjustment to be segmented and simplified. The conventional drawing process is broken through, and a forming process is adopted first, so that the resilience is convenient to adjust. Compared with drawing processing, the plate blank does not need to reserve a pressing edge, so that the deformation factor of converting pressing force into internal stress is avoided, the torsional resilience in the length direction is greatly reduced, and the precision and the qualification rate of products are improved.

Drawings

FIG. 1 is a schematic structural view of the invention

In the drawing, 1 is a lower die bottom plate, 2 is a lower die base, 3 is a solid block, 4 is a material supporting core, 5 is a blocking key, 6 is a lower die forming block, 61 is an inner insert block group, 62 is an outer insert block group, 7 is a positioner, 8 is a punch, 9 is an upper die base, and 10 is a machine tool ejector rod;

FIG. 2 is a schematic structural view of a reinforcing plate for left and right side members of a vehicle according to the present invention

FIG. 11 is a vehicle left and right side rail reinforcement panel;

FIG. 3 is a reference diagram of the use state of the present invention

The arrow of the line in the figure is the moving direction of the material supporting core;

FIG. 4 is a perspective view of the lower mold of the present invention

In the drawing, 611 is the first inner insert, 612 is the second inner insert, 613 is the third inner insert, 621 is the first outer insert, 622 is the second outer insert, 623 is the third outer insert, and 12 is the cavity.

Detailed Description

As shown in figures 1-4, the reinforcing plate 11 of the left side beam and the right side beam of the vehicle is integrally arched, the cross section of the reinforcing plate is U-shaped, the die comprises an upper die and a lower die, the upper die comprises an upper die holder 9 and a punch 8, the lower die comprises a lower die holder 2, a lower die forming block 6 and a machine tool ejector rod 10, the punch 8 on the upper die and the lower die forming block 6 on the lower die are respectively provided with a pair and are symmetrically arranged relative to the central lines of the upper die and the lower die; the lower die forming block 6 comprises an inner side insert group 61, an outer side insert group 62 and a material supporting core 4, wherein the inner side surfaces of the inner side insert group 61 and the outer side insert group 62 and the top surface of the material supporting core 4 form the die cavity 12 which is integrally arched and has a U-shaped section; the inner insert group 61 and the outer insert group 62 are formed by splicing a plurality of inserts (such as a first inner insert 611, a second inner insert 612, a third inner insert 613, a first outer insert 621, a second outer insert 622 and a third outer insert 623 in fig. 4) in a segmented manner in the length direction, and the inner insert group 61 and the outer insert group 62 are fixedly connected to the lower die holder 2; the material supporting core 4 is movably connected to the lower die base 2, and the bottom surface of the material supporting core 4 contacts the machine tool ejector rod 10; and positioners 7 are respectively arranged at the upper edge openings of the two sides of the cavity 12. In order to adjust and fix the position of the outer insert block group 62, some blocking keys 5 can be arranged between the lower die holder 2 and the outer insert block group 62.

And a solid block 3 for limiting the downward stroke of the material supporting core 4 is also arranged on the lower die base 2. In order to prevent the lower die holder 2 from being abraded due to impact in long-term work, the lower die base plate 1 can be arranged at the lower part of the solid block 3.

The working principle of the invention is that the machine tool ejector rod 10 jacks up the material supporting core 4 at the beginning, and the upper die base 9 descends under the driving of the press sliding block. The plate member is pressed by contacting the core 4. The material supporting core 4 and the upper die 9 move downwards, the plate is formed under the contact action of the lower die forming block 6 and the upper die forming insert (punch 8), the forming action is finished, and the die is opened.

Claims (2)

1. The stamping forming die is characterized in that the punch on the upper die and the lower die forming block on the lower die are respectively provided with a pair and are symmetrically arranged relative to the central lines of the upper die and the lower die; the lower die forming block comprises an inner side insert group, an outer side insert group and a material supporting core, wherein the inner side surfaces of the inner side insert group and the outer side insert group and the top surface of the material supporting core form a die cavity which is integrally arched and has a U-shaped section; the inner insert group and the outer insert group are formed by splicing a plurality of inserts in a segmented manner in the length direction, and are fixedly connected to the lower die seat; the material supporting core is movably connected to the lower die base, and the bottom surface of the material supporting core is contacted with the machine tool ejector rod; and positioners are respectively arranged at the upper edge ports at the two sides of the cavity.

2. The punch forming die for the sectional forming process of the left and right reinforcing plates of the vehicle as claimed in claim 1, wherein a solid block for limiting the downward stroke of the material supporting core is further arranged on the lower die base.

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