CN-224209048-U - Deformable working belt stamping die for backward extrusion forming

CN224209048UCN 224209048 UCN224209048 UCN 224209048UCN-224209048-U

Abstract

The utility model discloses a deformable working belt stamping die for backward extrusion forming, which is characterized in that a shank accommodating cavity is formed in a connecting end of a stamping rod, an annular shoulder is formed in a connecting end face of the stamping rod, the stamping head comprises a stamping head shank and a stamping head working part, the stamping head shank is arranged on a tail end face of the stamping head working part, a pin hole is formed in the stamping head shank, the pin hole is connected with the shank accommodating cavity in a matched mode through a joint pin, an adjusting gap is formed between the pin hole and the joint pin, an annular cavity is formed in the tail end face of the stamping head working part, and a working belt is arranged on the periphery, close to the tail end face, of the stamping head working part. The utility model utilizes the annular cavity at the end part of the punch to work with the annular convex shoulder of the punch rod, so that the diameter of a working belt of the punch can be increased in the working stroke, and the diameter can be reduced in the return stroke, thereby reducing the demoulding force, facilitating the separation when the punch is lifted, reducing the demoulding process of the punch, realizing the repeated use of the punch, and reducing the production cost.

Inventors

Request for anonymity
Request for anonymity
CHENG HUILAN
SUN MIAOMIAO
AI ZHIBIN
WANG XUE
CHEN WEI
YU JIE
LIU ZHI

Assignees

无锡派鑫航空科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250525

Claims (6)

1. The deformable working belt stamping die for the backward extrusion forming is characterized by comprising a stamping head and a stamping rod, wherein a handle accommodating cavity is arranged in the connecting end of the stamping rod and used for accommodating and mounting the stamping head handle, and an annular shoulder is arranged on the connecting end face of the stamping rod; the punch comprises a punch handle and a punch working part, the punch handle is arranged on the tail end face of the punch working part, a pin hole is formed in the punch handle, the pin hole is connected with the handle accommodating cavity in a matched mode through a joint pin, an adjusting gap is formed between the pin hole and the joint pin, an annular cavity is formed in the tail end face of the punch working part and used for being embedded with an annular shoulder of a punch rod, and a working belt is arranged on the periphery, close to the tail end face, of the punch working part.
2. A deformable working belt die for back extrusion as recited in claim 1, wherein said punch connecting end face and punch tail end face have a clearance in a free state.
3. A deformable working belt die for back extrusion as claimed in claim 2, wherein the clearance between the punch connecting end face and the punch tail end face is 3mm in a free state.
4. The deformable strip die for reverse extrusion according to claim 1, wherein the inner wall surface of the annular cavity is a vertical surface, the outer wall surface of the annular cavity is inclined outwardly with respect to the inner wall surface of the annular cavity, the inner wall surface of the annular shoulder is a vertical surface, and is engaged with the inner wall surface of the annular cavity, the outer wall surface of the annular shoulder is inclined outwardly with respect to the inner wall surface of the annular shoulder, and the inclination angle of the outer wall surface of the annular shoulder is greater than the inclination angle of the outer wall surface of the annular cavity by 1 °.
5. A deformable working belt die for back extrusion as recited in claim 1, wherein said pin bore is configured in a racetrack shape to ensure an adjustment gap between the dowel pin and the pin bore.
6. A deformable working belt die for back extrusion as claimed in claim 5, wherein said adjustment gap is in the range of 3-5mm.

Description

Deformable working belt stamping die for backward extrusion forming Technical Field The utility model belongs to the field of metal pressure processing, and particularly relates to a deformable working belt stamping die for backward extrusion forming. Background With the advancement of extrusion technology, the requirements of modern manufacturing industry on precision forgings are increasing, and not only are metal flows required to be optimized to ensure part performance and surface quality, but also thinner wall thickness designs are required to be realized on the premise of maintaining strength. Meanwhile, in order to reduce the production cost, the design of the extrusion tool must be compatible with low deformation resistance, high durability, and stable release performance. However, conventional punch structures have faced serious demolding challenges in existing cup back-extrusion processes. The current widely used punch adopts a design of combining a cylindrical working part and a rod-shaped tail part, and an annular thickening calibration ring (working annular belt) is arranged at the end part. When the extrusion is finished, the inner diameter of the die and the inner diameter of the section of the extrusion piece above the working cylindrical surface of the punch head can be reduced due to elastic deformation, and the blank size can be overlapped with the residual deformation after the extrusion, so that interference fit is formed between the punch head and the inner wall of the workpiece. When the punch returns to the die, the connecting part of the working part and the tail part is subjected to extremely high stress due to huge axial tension, the punch is finally broken, and the working section remains in the workpiece. This not only adds additional punch separation processing procedures, but also forces each blank to be equipped with a special punch in the production process, thus greatly improving the tool loss rate and the production cost. The technical defect severely restricts the efficient production of the precise thin-wall forging piece, and becomes a key bottleneck restricting the development of the industry. The existing scheme cannot effectively balance the contradiction between the forming precision and the demolding reliability, and a novel punch structure is needed to realize a stable and low-cost demolding process while ensuring the forming quality. Disclosure of utility model In order to solve the defects in the prior art, the utility model provides the deformable working belt stamping die for backward extrusion forming, which utilizes the annular cavity at the end part of the stamping head to work with the annular shoulder of the stamping rod, so that the diameter of the working belt of the stamping head can be increased in the working stroke (under pressure) and can be reduced in the return stroke (withdrawal), thereby reducing the stripping force, facilitating the separation of the stamping head in the lifting (stripping) process, reducing the stripping process of the stamping head, realizing the repeated use of the stamping head and reducing the production cost. The technical scheme adopted in the utility model is as follows: the deformable working belt stamping die for the backward extrusion forming comprises a stamping head and a stamping rod, wherein a handle accommodating cavity is formed in the connecting end of the stamping rod and used for accommodating and mounting a stamping head handle, and an annular shoulder is arranged on the connecting end face of the stamping rod; the punch comprises a punch handle and a punch working part, the punch handle is arranged on the tail end face of the punch working part, a pin hole is formed in the punch handle, the pin hole is connected with the handle accommodating cavity in a matched mode through a joint pin, an adjusting gap is formed between the pin hole and the joint pin, an annular cavity is formed in the tail end face of the punch working part and used for being embedded with an annular shoulder of a punch rod, and a working belt is arranged on the periphery, close to the tail end face, of the punch working part. Preferably, in the free state, a gap exists between the punch connecting end face and the punch tail end face. Preferably, in the free state, the gap between the punch connecting end face and the punch tail end face is 3mm. Preferably, the inner wall surface of the annular cavity is a vertical surface, the outer wall surface of the annular cavity is inclined outwards relative to the inner wall surface of the annular cavity, the inner wall surface of the annular shoulder is a vertical surface and is matched with the inner wall surface of the annular cavity, the outer wall surface of the annular shoulder is inclined outwards relative to the inner wall surface of the annular shoulder, and the inclination angle of the outer wall surface of the annular shoulder is 1 DEG greater than that of the outer wall surface of th