CN108393402B - A lower die of a bending die with a positioning device and no stretch marks - Google Patents

Abstract

The present invention relates to a mark-free bending die lower die with a positioning device, comprising a positioning device and a lower die with a groove, wherein two bearing parts with arc-shaped cross sections are arranged in the groove, and the shape of the groove is adapted to the shape of the two bearing parts, and the top ends of the two bearing parts are planes and are located in the same horizontal plane. The above-mentioned mark-free bending die adopts a method of arranging two arc-shaped cross sections in the groove of the lower die, and the shape of the groove is adapted to the shape of the two bearing parts, so that the bearing parts can rotate when subjected to force, and the planes of the top ends of the bearing parts are on the same plane, so that the plate and the planes of the top ends of the bearing parts fit together, and it is ensured that when the plate is processed, the plate and the planes of the top ends of the bearing parts are always fitted together, and no marks will be generated on the plate.

Description

A lower die of a bending die with a positioning device and no stretch marks

[Technical field]

The invention relates to the field of plate bending, and in particular to a lower die of a bending die with a positioning device and no tensile marks.

[Background technology]

At present, the bending mold of the plate is generally composed of an upper mold and a lower mold with a V-groove of corresponding angle. Due to the insufficient hardness of the lower mold, the R arcs on both sides of the lower mold are worn during the processing, and the plate is rubbed by the lower mold during the bending and stretching deformation process, which easily causes obvious pull marks on the surface of the plate in the direction of the plate. For products that require surface shot blasting or plastic spraying, the pull marks are often more obvious after surface treatment. The traditional processing method is to pad the lower mold with plastic film or apply oil, but the plastic film is not cleaned properly, which will affect the subsequent processing. Bending after oiling requires an additional degreasing process.

[Summary of the invention]

Based on this, it is necessary to provide a markless bending die lower die that eliminates product pull marks.

The mark-free bending die with a positioning device of the present invention comprises a lower die and an upper die with grooves, wherein the groove I is provided with two load-bearing components with arc-shaped cross sections, and the shape of the groove I is adapted to the shape of the two load-bearing components, the top ends of the two load-bearing components are planes and are located on the same horizontal plane, and the upper die is located above the connection between the two load-bearing components.

Preferably, the radius of the two bearing components is related to the thickness of the plate.

Further preferably, a positioning device is provided on one of the bearing components, and the positioning device is used to position the plate to be processed.

Further preferably, the positioning device comprises a positioning plate, a groove II is formed on the positioning plate, a cover plate is mounted on the groove II, a slide plate is mounted on the cover plate, and the slide plate can slide on the positioning plate.

Further preferably, a spring is installed in the groove II, and a connecting rod is fixed to the rear end of the slide plate. The connecting rod extends into the interior of the groove II, and the lower part thereof presses against the front end of the spring.

Further preferably, there are two connecting rods, and the cover plate is provided with a long strip through hole for the connecting rods to pass through.

Preferably, the center distance between the two bearing components is greater than or equal to the diameter of the bearing component.

The lower mold is of universal type, and by replacing the upper mold of the corresponding angle, the plate with thickness within a certain range can be bent at multiple angles.

The above-mentioned bending die without stretch marks adopts two bearing components with arc-shaped cross-sections arranged in the groove of the lower die. The shape of the groove is adapted to the shape of the two bearing components. The upper die is arranged above the connection of the two bearing components to facilitate the processing of the plate, so that the bearing components rotate when force is applied, and the planes of the top ends of the bearing components are on the same plane, so that the plate and the planes of the top ends are fitted together, ensuring that when the plate is processed, the planes of the plate and the top ends of the bearing components are always fitted together. This is different from the disadvantage of traditional bending die products that the plate moves downward with the upper die and is affected by the R arc of the lower die, and no stretch marks will be generated on the plate.

【Brief Description of the Drawings】

FIG1 is a schematic structural diagram of a non-stretch mark bending die according to the present invention;

FIG. 2 is a schematic diagram of the processing of a sheet material by the non-stretch mark bending die of the present invention.

FIG. 3 is a top view of the positioning device of the present invention.

FIG. 4 is a side view of the positioning device of the present invention.

In the figure, 1, bearing component, 2, lower mold, 3, upper mold, 4, plate, 5, positioning device, 6, positioning plate, 7, cover plate, 8, slide plate, 9, spring, 10, connecting rod, 11, long strip through hole.

[Specific implementation method]

The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG1 , a bending die without a stretch mark comprises a lower die 2 with a groove I. Two bearing parts 1 with arc-shaped cross sections are arranged in the groove I of the lower die 2. The inner wall section of the groove I is arc-shaped, which matches the cross-sectional shape of the bearing part 1. The top ends of the two bearing parts 1 are planes. The bearing part 1 is used to bear a plate 4, and the plate 4 is flush with the plane at the top end of the bearing part 1. Among them, the upper die 3 is a common upper die of a bending die, which is aligned with the connection between the two bearing parts 1 to apply pressure to the plate 4. When the upper die 3 moves downward to apply pressure to the plate 4, the pressure point is between the two bearing parts 1, and the plate 4 bends into the groove I. The upper die 3 continues to apply pressure downward, and the pressure forces the two bearing parts 1 to rotate inward in the opposite direction, and the plane at the top end of the bearing part 1 rotates in contact with the plate. In this way, the plate will not slip into the V-groove like a traditional bending die due to its bending deformation, and thus no stretch marks will be generated.

In this embodiment, the cross-sections of the two bearing members 1 are semicircular, with a gap, and the planes of the tops of the two bearing members 1 are on the same plane. As shown in FIG1 , a positioning device 5 is provided on one of the bearing members 1, and the positioning device 5 moves in the direction of the arrow as the sheet 4 is extended during bending ( FIG2 ), and will not interfere with the bending size of the sheet 4. If it is a fixed positioning pin, it will cause interference when the sheet is extended and stretched during bending.

As shown in Figures 3-4, the positioning device 5 includes a positioning plate, a groove II is opened on the positioning plate 6, a cover plate 7 is installed on the groove II, a slide plate 8 is installed on the cover plate 7, and the slide plate 8 can slide on the positioning plate 6. A spring 9 is installed in the groove II. A connecting rod 10 is fixed to the rear end of the slide plate 8. The connecting rod 10 extends into the interior of the groove II, and its lower part is against the front end of the spring 9. There are two connecting rods 10, and a long strip through hole 11 is opened on the cover plate 7 for the connecting rod 10 to pass through.

As shown in Figures 1 and 2, the process of the above-mentioned non-stretch mark bending die for processing the plate is: place the plate 4 on the lower mold 2, and make the plate 4 flat with the plane of the top of the bearing component 1 set in the groove, use the positioning device 5 to position it, and move the upper mold 3 downward to apply pressure to the plate 4. When the plate 4 and the bearing component 1 are subjected to force, the plate 4 will bend into the gap between the bearing components 1, and at the same time force the two bearing components 1 to rotate inward around their respective centers, so that the top and part of the side wall of the bearing component 1 protrude from the groove. The top plane of the bearing component 1 always keeps in contact with the bent plate 4 during the rotation process.

Claims (2)

1. The utility model provides a take positioner's no draw mark bending die, includes lower mould piece and the last mould piece of taking the recess, its characterized in that, be provided with two bearing parts that take the cross-section and take the shape looks adaptation of convex in recess I, recess I's shape and two bearing parts, the centre-to-centre spacing of two bearing parts is not less than the diameter of bearing parts, two bearing parts top are the plane, lie in same horizontal plane, the last mould piece is located the top of two bearing parts junction, is provided with positioner on one of them bearing parts, this positioner is used for the panel that needs to process to fix a position, positioner includes the locating plate, set up recess II on the locating plate, install the apron on the recess II, install the slide on the apron, the slide can slide on the locating plate, install the spring in the recess II, the rear end of slide is fixed with the connecting rod, the connecting rod stretches into recess II's inside, and its lower part top is at the front end of spring, the connecting rod is 2, set up the rectangular through-hole that supplies the connecting rod to pass on the apron,

When the plate is processed, the plate is placed on the lower module, the plate is flatly attached to the plane of the top end of the bearing component arranged in the groove, the positioning device is used for positioning, the upper module moves downwards, pressure is applied to the plate, when the plate and the bearing component are stressed, the plate can bend inwards towards the gap between the bearing components, meanwhile, the two bearing components are forced to rotate inwards around the respective circle centers, the top end and part of the side wall of the bearing component protrude out of the groove, the positioning device can move outwards along with the extension of the plate, and the top end plane of the bearing component is always attached to the bent plate in the rotating process.

2. The stretch mark free bending die of claim 1, wherein the radius of the two load bearing members is sized to correlate to the sheet thickness.