Composite die with cutter groove structure for pre-bending workpiece

Abstract

The utility model provides a composite die with a cutter groove structure for pre-bending a workpiece, which relates to the field of bending dies, and comprises an upper die fixing block and a bending lower cutter, the upper surface of the upper die fixing block is provided with a cutter groove with a V-shaped longitudinal section, the forming angle of the cutter groove is consistent with that of a cut-off cutter, and the cutting-off cutter is provided with a cutter groove with a V-shaped longitudinal section. An oval through groove with the depth ranging from 0.4 mm to 0.8 mm is milled in the groove bottom of the V-shaped cutter groove, so that a certain distance is kept between the cut-off tool and the groove bottom all the time, and then the situation that burrs are generated on the lower portion of a pre-bent workpiece, and consequently stripping of the workpiece from the cutter groove is affected is avoided. Compared with the prior art, the problem that a cut-off tool clamps materials in the workpiece pre-bending process is actually solved, the machining efficiency and the product quality of the composite die can be improved, and working hours are saved.

Description

Technical Field

[0001] The utility model relates to the field of bending dies, and particularly to a composite die with a knife groove structure for pre-bending workpieces. Background Art

[0002] For the metal thin plates used in turnover box products in the field of logistics warehousing, double hemming operations need to be completed during processing. Generally, it is more convenient to use a special double hemming bending die to complete in two working steps. First, the workpiece is pre-bent on the V-shaped groove of the composite die, and then the flattening operation of the workpiece hemming is carried out. During the pre-bending process, since the edge angle of the cutting knife is the same as the angle of the knife groove, after the pre-bending operation, due to the thin edge of the cutting knife, the cutting knife is prone to bending at the bottom of the knife groove and forming burrs on the workpiece, which hinders the workpiece from being stripped and affects the processing efficiency. Therefore, it is urgent to solve the problem of difficult stripping during the pre-bending operation. Content of the Utility Model

[0003] The first aspect object of the utility model is to provide a knife groove structure for pre-bending workpieces, and solve the problem of difficult stripping of the bending cutting tool.

[0004] The second aspect object of the utility model is to provide a composite die for pre-bending workpieces, which can complete two operations of pre-bending and flattening in a single working step.

[0005] In order to solve the above problems, the technical solution adopted is as follows:

[0006] A composite die with a knife groove structure for pre-bending workpieces, the knife groove structure of which includes an upper die fixing block with a knife groove having a V-shaped longitudinal section on its upper surface, and further includes a bending upper knife directly above the upper die fixing block. The angles formed by the bending upper knife and the knife groove are the same. A through groove penetrating the bottom of the groove is milled downward at the bottom position of the knife groove, so that there is always a certain distance gap between the workpiece and the bottom of the knife groove during the pre-bending process, thereby avoiding the generation of burrs at the lower part of the pre-bent workpiece and hindering the workpiece from being stripped.

[0007] Preferably, the longitudinal section of the through groove is oval, and the groove opening part is smoothed.

[0008] Preferably, the depth of the through groove is 0.4 mm - 0.8 mm.

[0009] Preferably, the depth of the through groove is 0.5 mm.

[0010] The composite die further includes a floating ejector block located below the upper die fixing block, a return spring fixedly connected to the floating ejector block, a plurality of equal-height screws surrounded by the return spring, and a lower die fixing block below the return spring. A flattening station is provided on one side of the floating ejector block between the upper die fixing block and the lower die fixing block. When working, after placing the pre-bent workpiece into the flattening station, the flattening operation of another workpiece can be completed during the up-and-down floating process of the floating ejector block. During the flattening operation, the floating ejector block moves up and down under the action of the return spring, and the equal-height screws shuttle up and down in the return spring, so that the pre-bending and flattening operations are completed simultaneously at the upper and lower stations.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The present utility model solves the problem of clamping the bending upper tool in the pre-bending of the workpiece, which is beneficial to improving the working efficiency of the composite die operation and saving working hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall structure diagram of the embodiment of the present utility model;

[0014] Figure 2 It is the enlarged view of the bottom part of the groove of the embodiment of the present utility model;

[0015] Figure 3 It is the structure diagram of the bending die in the prior art;

[0016] Figure 4 It is the enlarged view of the bottom of the cutting groove in the prior art;

[0017] Figure 5 It is the structure diagram of the workpiece processed by the original die;

[0018] Figure 6 It is the structure diagram after the cutting tool in the prior art contacts the bottom of the groove;

[0019] Figure 7 Schematic diagram of the burr part of the workpiece in the prior art;

[0020] Figure 8 It is the front view and side view of the lower die of the embodiment of the present utility model.

[0021] Markings in the figure: 1 - bending upper tool, 2 - tool groove, 3 - burr part of the workpiece, 4 - workpiece, 5 - upper die fixing block, 6 - return spring, 7 - floating ejector block, 8 - lower template, 9 - through groove, 10 - flattening station, 11 - lower die fixing block, 12 - equal-height screw, 13 - edge protrusion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further explained and illustrated below with reference to the drawings and embodiments.

[0023] It should be noted that, based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Embodiment: Please refer to Figure 1 and Figure 2 , a composite die with a knife groove structure for pre-bending workpieces. The knife groove structure includes an upper die fixing block 5 with a knife groove 2 having a V-shaped longitudinal section on its upper surface and a bending upper knife 1 directly above it. The opening angles of the bending upper knife 1 and the knife groove 2 are the same. An elliptical through groove 9 with a depth of 0.5 mm is milled at the bottom of the knife groove 2, so that the bending upper knife 1 approaches the bottom of the groove without the workpiece contacting the bottom of the groove, avoiding the generation of a cutting edge bulge 13 at the cutting edge part when the bending upper knife 1 descends to the bottom of the groove during the bending operation, thus avoiding the generation of burrs at the lower part of the workpiece 4, and further avoiding the adhesion of the lower part of the workpiece 4 to the bending upper knife 1, and accelerating the blanking process of the workpiece 4.

[0025] As Figure 1 and Figure 8 shown, a composite die for pre-bending workpieces includes the above-mentioned workpiece pre-bending knife groove structure, and further includes a floating ejector block 7 below the upper die fixing block 5, a return spring 6 fixedly connected below the floating ejector block 7, a plurality of equal-height screws 12 surrounded by the return spring 6, and a lower die fixing block 11 fixed below the return spring 6. A flattening station 10 is reserved on one side of the floating ejector block 7, and the flattening station 10 is a square open on the side away from the floating ejector block 7. During operation, the bent side of the workpiece 4 after the pre-bending operation is placed into the flattening station 10, and the workpiece 4 can be flattened while the floating ejector block 7 floats up and down. During the flattening process, the return spring 7 undergoes longitudinal deformation, and the equal-height screws 12 shuttle up and down in the return spring 6.

[0026] Working process: First, place the workpiece 4 to be bent on the V-shaped knife groove 2, put the workpiece 4 after the pre-bending is completed into the flattening station 10, and then start driving the bending upper knife 1 to descend. After the cutting edge part contacts the workpiece 3, it continues to descend until the workpiece 4 approaches the bottom of the V-shaped knife groove 2. At this time, the floating ejector block 7 is pressed down under the action of the return spring 6, the vertical space of the flattening station 10 is compressed, and the workpiece 4 is flattened. At this time, as the floating ejector block 7 descends, the upper die fixing block 5 and the lower die fixing block 14 approach each other, completing the flattening operation of the workpiece 4; since the cutting edge part of the bending upper knife 1 does not deform, the workpiece 4 can be smoothly blanked after it ascends. In summary, this die can complete two die operation processes in a single working step.

[0027] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, in any aspect, the embodiments should be regarded as exemplary rather than restrictive. The scope of the present utility model is defined by the appended claims rather than the above explanations and descriptions. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. At the same time, any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A composite die with a knife groove structure for pre-bending workpieces, including an upper die fixing block (5) with a knife groove (2) having a V-shaped longitudinal section on its upper surface, and a bending upper knife (1) positioned directly above the upper die fixing block (5), wherein the cutting edge of the bending upper knife (1) is at the same angle as the opening angle of the knife groove (2), and is characterized in that: A through groove (9) is milled downward at the bottom position of the knife groove (2), and the through groove (9) keeps a gap between the workpiece (4) and the bottom of the knife groove (2) during the pre-bending process all the time.

2. The composite mold according to claim 1, wherein: The longitudinal section of the through groove (9) is oval, and the notch part thereof is smoothed.

3. The composite mold according to claim 1, characterized in that: The depth of the through groove (9) is 0.4 mm - 0.8 mm.

4. The composite mold according to claim 3, wherein: The depth of the through groove (9) is 0.5 mm.

5. The composite mold according to claim 1, wherein: It further includes a floating ejector block (7) located below the upper die fixing block (5), a return spring (6) fixedly connected below the floating ejector block (7), an equal-height screw (12) located inside the return spring (6), and a lower die fixing block (11) located below the return spring (6); a flattening station (10) located between the upper die fixing block (5) and the lower die fixing block (11) is formed on one side of the floating ejector block (7).

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