CN-122007254-A - Edge-controllable double-sided rounded arc forming structure and method for stamping part

CN122007254ACN 122007254 ACN122007254 ACN 122007254ACN-122007254-A

Abstract

The invention discloses a structure and a method for forming a controllable double-sided circular arc on the edge of a stamping part, wherein the structure comprises an upper die assembly and a lower die assembly, the upper die assembly comprises an upper die seat, a punching male die, an upper circular arc forming male die and a shaping upper die which are sequentially and fixedly arranged on the lower surface of the upper die seat along a feeding direction, the lower die assembly comprises a lower die seat, and a punching female die, a shaping lower die and a lower circular arc forming male die which are sequentially and fixedly arranged on the upper surface of the lower die seat along the feeding direction, wherein the punching male die and the punching female die form a first station, the upper circular arc forming male die and the shaping lower die form a second station, and the shaping upper die and the lower circular arc forming male die form a third station.

Inventors

WU HANXI
CHEN WENCHAO
LI KANG
MA LIZHE
CHEN SONG

Assignees

东实(武汉)实业有限公司

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (9)

1. The double-sided rounding arc forming structure with the controllable edge of the stamping part comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises an upper die base, a punching male die, an upper arc forming male die and a shaping upper die which are sequentially and fixedly arranged on the lower surface of the upper die base along a feeding direction, the lower die assembly comprises a lower die base, a punching female die, a shaping lower die and a lower arc forming male die which are sequentially and fixedly arranged on the upper surface of the lower die base along the feeding direction, the punching male die and the punching female die form a first station and are used for punching or trimming a part, the upper arc forming male die and the shaping lower die form a second station and are used for rounding forming the edge of the upper surface of the part, the shaping upper die and the lower arc forming male die form a third station and are used for rounding forming the edge of the lower surface of the part, the parts are fixed in the horizontal direction, and the parts are driven by an external feeder and sequentially pass through the first station, the second station and the third station in a stepping mode along the feeding direction.
2. The edge-controllable double-sided rounded arc forming structure of a stamping part according to claim 1, further comprising a pressing plate arranged below the upper die holder and surrounding the punching punch, the upper arc forming punch and the shaping upper die for pressing the part during stamping.
3. The edge-controllable double-sided circular arc forming structure of a stamping part according to claim 1, wherein the pressing plate is provided with a positioning pin, and the positioning pin is matched with a pre-punched hole on the part for accurate positioning.
4. The edge-controllable double-sided circular arc forming structure of a stamping part according to claim 1, further comprising a material lifting plate, wherein the material lifting plate is arranged above the lower die holder and is connected with the lower die holder through a lower die pressure source, and in an open die state, the material lifting plate lifts the part upwards to enable the part to be separated from a lower die working surface, so that a feeder pushes the part to advance by one step distance.
5. The edge-controllable double-sided circular arc forming structure of the stamping part according to claim 1, wherein the lower end face of the upper circular arc forming male die is a convex curved surface, the upper end face of the shaping lower die is a concave curved surface matched with the upper end face of the shaping lower die, the lower end face of the shaping upper die is a plane or a micro concave surface, and the upper end face of the lower circular arc forming male die is a convex curved surface and is used for being matched with the shaping upper die to complete the rounding and shaping of the lower side edge.
6. The edge-controllable double-sided rounded arc forming structure of a stamping part according to claim 1, wherein the sum of the vertical clearance between the upper arc forming punch and the lower shaping punch and the vertical clearance between the upper shaping punch and the lower shaping punch is equal to the thickness of the part.
7. A method for forming a controllable double-sided circular arc on the edge of a stamping part, which is characterized by adopting the controllable double-sided circular arc forming structure on the edge of the stamping part according to any one of claims 1-6, and comprising the following steps: S1, feeding a stamping part to be processed into a forming structure along a feeding direction by an external feeder, punching or trimming the stamping part by using a punching male die and a punching female die at a first station, and forming a pre-punching hole for subsequent positioning; S2, after the step S1 is completed, lifting the pressing plate to release the stamping part, and enabling the stamping part to move forwards by one step distance to a second station under the drive of the feeder; S3, after the step S2 is completed, lifting the material pressing plate again to release the constraint on the stamping part, enabling the stamping part to move forwards by one step distance to a third station under the drive of the feeder, then, reducing the pressure of the stamping part by the material pressing plate, and in the state, applying reverse pressure to the edge of the lower surface of the stamping part through the cooperation of the shaping upper die and the lower arc shaping male die, performing lower round corner plastic shaping and synchronously flattening burrs to form a lower R angle.
8. The method for forming the edge-controllable double-sided circular arcs of the stamping part according to claim 7, wherein, In step S2, when the single-side fillet plastic forming is carried out on the edge of the upper surface of the stamping part at the second station, the upper arc forming male die is controlled to move at a first descending speed, wherein the first descending speed is adopted in the descending process from the first contact of the male die with the edge of the upper surface of the stamping part to the completion of forming by closing the lower shaping die in place, and the time consumption of the process is not less than 0.3 seconds; In step S3, when the third station performs fillet shaping on the edge of the lower surface of the stamping part, controlling the shaping upper die to move at a second downlink speed, where the second downlink speed is a speed adopted in a downlink process from the first contact of the upper die with the edge of the lower surface of the stamping part to the complete closure of the upper die with the lower circular arc shaping male die, and the time consumed in the process is not more than 0.15 seconds; The second descending speed is obviously higher than the first descending speed, the forming end face of the upper arc forming male die is provided with a micro-ridge extending along the feeding direction, and the height of the micro-ridge is 0.02-0.08 mm.
9. The method for forming the edge-controllable double-sided circular arc of the stamping part according to claim 8, wherein in the step S3, the shaping upper die is controlled to descend at a second descending speed, and in the interval from 1.0 mm to 0.5mm of the top end of the circular arc shaping male die under the end surface distance, the descending speed is reduced to 30% -50% of the second descending speed, and the die is closed rapidly after lasting for 0.02-0.05 seconds, so as to generate controllable micro-impact, enhance burr grinding and inhibit rebound.

Description

Edge-controllable double-sided rounded arc forming structure and method for stamping part Technical Field The invention relates to the field of edge-controllable double-sided circular arc forming of stamping parts. More particularly, the invention relates to a stamping part edge controllable double-sided rounded arc forming structure and a stamping part edge controllable double-sided rounded arc forming method. Background The sharp edges or burrs of the edges of the stamping parts of the automobile can have a series of serious influence on surrounding flexible environment parts such as rubber parts, fabrics, wire harnesses and the like after the automobile body is assembled. The core risk is long-term wear, nicks, and eventually leads to functional failure or safety accidents. Controlling the sharp edge of the stamping part needs three stages of prevention at the stamping production source, treatment in the assembly process and protection after assembly. And controlling a punching source, namely controlling a punching gap and keeping the cutting edge sharp, ensuring that the punching male-female die gap is uniform and proper, and producing low-burr products meeting the standard value still has sharp edges, wherein the worn cutting edge is required to be ground or replaced regularly, and the die is required to be frequently maintained. This is the most desirable and economical method when sharp edges are not required. And the pre-assembly treatment, namely edge rounding is carried out on sharp edges generated on the parts by manual or automatic polishing before assembly, so that the safety and the durability can be obviously improved. The rounding effect is good, but when the rubber piece with higher cost and time passes near the metal plate hole and sharp edge, the protection sleeve, the corrugated pipe, the wear-resistant adhesive tape or the special support is designed and used for physical isolation. And the personnel contact area or the contact part with the wire harness is isolated and protected, so that the abrasion risk is reduced. This method is costly. The assembly process is protected, namely, the isolation of sharp edges of stamping parts is designed and a protection structure is added in the product design stage, namely, when a wire harness or a rubber part passes through a sheet metal hole and the vicinity of the sharp edges, a protective sleeve, a corrugated pipe, a wear-resistant adhesive tape or a special bracket is designed and used for physical isolation. And the personnel contact area or the contact part with the wire harness is isolated and protected, so that the abrasion risk is reduced. This method is costly. Traditional die structure at punching press source control burr height or clap burr, the stamping workpiece edge of producing still is C angle oblique angle edge, and newly produced C angle edge still can cause the fish tail to environmental parts such as rubber, pencil. The need for stamping edge quality has changed from "burr-free" to "full fillet". Disclosure of Invention To achieve these objects and other advantages and in accordance with the purpose of the invention, a preferred embodiment of the invention provides a stamping edge controllable double-sided circular arc forming structure, which comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises an upper die base, a punching male die, an upper circular arc forming male die and a shaping upper die which are sequentially and fixedly arranged on the lower surface of the upper die base along a feeding direction, the lower die assembly comprises a lower die base, a punching female die, a shaping lower die and a lower circular arc forming male die which are sequentially and fixedly arranged on the upper surface of the lower die base along the feeding direction, wherein the punching male die and the punching female die form a first station for punching or trimming a part, the upper circular arc forming male die and the shaping lower die form a second station for rounding the upper surface edge of the part, the shaping upper die and the lower circular arc forming male die form a third station for rounding the lower surface edge of the part, the three stations are fixed in horizontal direction, and the part is driven by an external feeder, and sequentially passes through the first station, the second station and the third station in a stepping manner along the feeding direction. Preferably, the stamping die further comprises a pressing plate, wherein the pressing plate is arranged below the upper die holder, surrounds the punching male die, the upper arc forming male die and the shaping upper die, and is used for pressing the part in the stamping process. Preferably, the pressing plate is provided with a positioning pin, and the positioning pin is matched with the pre-punched hole on the part for accurate positioning. Preferably, the feeding device further comprises a feeding plate, wherei