Stamping dies and their deburring punches

Abstract

This invention relates to a deburring punch for a stamping die. The punch's cutting edge has a cutting end face and a deburring groove. The cutting end face is an outer surface of the cutting edge and is used to directly press down and cut into the sheet metal. The deburring groove is formed on one side of the cutting edge and extends to the cutting end face, defining a shearing line on the cutting end face. The shearing line includes a connected curvature gradient section and a deformation guide section. The curvature of the curvature gradient section gradually changes, and the deformation guide section is inclined along the length direction of the material to control material deformation and form a chamfer. The deburring punch can remove burrs at the edges and corners of the sheet metal, while the arc-shaped shearing line forms a smooth arc-shaped edge on the sheet metal. This allows the removed waste material to be recycled and reused, reducing waste and carbon emissions, and significantly reducing deburring time and improving quality.

Claims

1. A deburring punch for a stamping die, used to process a sheet metal, the deburring punch comprising: a main body having a fixed end and a processing end at opposite ends; a stamping direction, a cutting direction, and a material length direction perpendicular to each other; the main body extending along the stamping direction, the processing end being the end of the main body facing the stamping direction; a cutting edge formed at the processing end, and having: a cutting end face, which is an outer surface of the cutting edge away from the fixed end, the cutting end face being used to directly press down and cut into the sheet metal; and a plurality of deburring... The edge cutting grooves are arranged opposite each other along the length of the material; each of the deburring cutting grooves is formed on one side of the cutting edge and extends toward the processing end to the cutting edge face, and defines a shearing line on the cutting edge face; the shearing line includes a cut receiving section, a curvature gradient section and a deformation guide section connected in sequence; the curvature of the curvature gradient section gradually changes from the cut receiving section toward the deformation guide section; the deformation guide section forms an inclination angle relative to the length of the material to control the deformation distribution of the material during the shearing process and form a chamfer.

2. The deburring punch as described in claim 1, wherein the relative two endpoints of the curvature gradient segment of the shearing edge of each deburring groove are a cutting endpoint and a deformation endpoint, respectively, the cutting endpoint being adjacent to the cutting receiving segment, and the deformation endpoint being adjacent to the deformation guiding segment; the curvature gradient segment is a cloud-shaped line, and is formed by fitting a plurality of fitting points including the cutting endpoint and the deformation endpoint, and the curvature of the curvature gradient segment gradually increases or decreases from the cutting endpoint toward the deformation endpoint.

3. The deburring punch as described in claim 2, wherein the curvature of the curvature gradient segment of each of the deburring grooves gradually increases from the cut end to the deformation end.

4. The deburring punch as described in claim 2 or 3, wherein the cut receiving section of each of the deburring grooves extends along the cut direction; and the angle of inclination between the deformation guide section and the length direction of the material is between 3 and 9 degrees.

5. The deburring punch as described in claim 4, wherein the angle of inclination between the deformation guide section and the length direction of the material is between 5.8 degrees and 6.2 degrees.

6. The deburring punch as claimed in claim 4, wherein the projected dimension of the shearing edge line of each of the deburring grooves in the cutting direction is defined as a trimming width; the ratio of the length of the cut receiving segment to the trimming width is between 0.27 and 0.

33.

7. The deburring punch as claimed in claim 4, wherein the projected dimension of the shearing edge of each of the at least one deburring groove in the length direction of the material is defined as a trimming length; the ratio of the length of the deformation guide section to the trimming length is between 0.52 and 0.

62.

8. The deburring punch as described in any one of claims 1 to 3, wherein the deburring grooves include a first deburring groove and a second deburring groove disposed opposite each other in the length direction of the material, the first deburring groove and the second deburring groove being mirror images of a central surface of the deburring punch.

9. A stamping die for processing a sheet metal, the stamping die comprising: a lower die; an upper die located above the lower die and spaced apart from the lower die, and forming an upper punch channel; the upper die and the lower die being movable toward each other; a deburring punch slidably passing through the upper punch channel of the upper die, the deburring punch comprising: a body having a fixed end and a processing end at opposite ends; a stamping direction, a cutting direction, and a material length direction perpendicular to each other; the body extending along the stamping direction, the processing end being the end of the body facing the stamping direction; a cutting edge formed at the processing end and forming... The device comprises: a cutting edge face, which is an outer surface of the cutting portion away from the fixed end, the cutting edge face being used to directly press down and cut into the sheet metal; a plurality of deburring grooves, which are arranged opposite each other along the length direction of the material; each of the deburring grooves is formed on one side of the cutting portion and extends toward the processing end to the cutting edge face, defining a shearing line on the cutting edge face; the shearing line includes a sequentially connected slit receiving section, a curvature gradient section, and a deformation guide section; the curvature of the curvature gradient section gradually changes from the slit receiving section toward the deformation guide section; the deformation guide section forms an inclination angle relative to the length direction of the material to control the deformation distribution of the material during the shearing process and to form a chamfer; wherein, The stamping die has a punching state in which the upper die and the lower die move toward each other to clamp the sheet metal, and the deburring punch moves toward the lower die to process the sheet metal.

10. The stamping die as claimed in claim 9, wherein in the punching state, the distance between the lower die and the upper die is less than 10 mm.

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