CN-224212971-U - Felt forming die

CN224212971UCN 224212971 UCN224212971 UCN 224212971UCN-224212971-U

Abstract

The utility model discloses a felt forming die which comprises a lower die assembly and an upper die assembly. The lower die assembly comprises a lower bottom plate, a lower die and a lower die elastic block, the upper die assembly comprises an upper die, an upper die pressing plate and an upper die insert, the upper die insert is preferentially contacted with the lower die elastic block to form dynamic fit when the dies are closed, the edge of the felt sheet is kept in a non-compression state to freely flow in an initial stage, the deep cavity forming tensile stress is reduced, the stroke of the upper die insert controls the forming depth, and the bottom bulge of the upper die insert is embedded with the lower die elastic block type groove to realize synchronous forming of deep cavity and shallow cavity characteristics, so that the requirement of multiple procedures is reduced. The compression spring and the limiting rod cooperatively regulate and control material extension, and inhibit fold defects.

Inventors

LIU BO
XU MINLING
LIN DEYUN

Assignees

深圳市仁禾智能实业有限公司

Dates

Publication Date: 20260508
Application Date: 20250514

Claims (5)

1. The felt forming die is characterized by comprising a lower die assembly and an upper die assembly which are matched with each other; the lower die assembly comprises a lower bottom plate, a lower die and a lower die elastic block, wherein the lower die is fixedly arranged on the upper surface of the lower bottom plate, the middle part of the lower die is provided with a first containing cavity penetrating through the upper end face and the lower end face; The upper die assembly comprises an upper die, an upper die pressing plate and an upper die insert, wherein the upper die pressing plate is arranged below the upper die, a second containing cavity penetrating through the upper end face and the lower end face is formed in the middle of the upper die pressing plate, the upper die insert is embedded in the second containing cavity, the top of the upper die insert is rigidly connected with the upper die, and the bottom of the upper die insert extends to the lower surface penetrating through the second containing cavity and protruding out of the upper die pressing plate.
2. The felt forming die of claim 1, wherein the top of the lower die spring is configured with a concave groove, and the bottom of the upper die insert is configured with a convex structure matching the groove.
3. The felt forming die of claim 2, wherein the upper die assembly includes a hold-down spring disposed between the upper die and the upper die platen.
4. A felt forming die according to claim 3, wherein the upper die assembly comprises a stop lever structure, the upper end of the stop lever is rigidly fixed with the upper die, the lower end extension section is provided with a stop block with a diameter larger than that of the rod body, the upper die plate is provided with a gradient through hole penetrating through the upper surface and the lower surface of the upper die plate, the hole is of a stepped variable diameter structure, the stop lever penetrates through the gradient through hole to form sliding fit, and the limit of the travel of the upper die plate is realized through the abutting connection of the stop block and the Kong Najie ladder surface so as to prevent the upper die plate from being separated from the upper die.
5. The felt forming die according to claim 1, further comprising a guide rod, wherein the lower end of the guide rod is fixed to the lower die assembly, and the upper end of the guide rod passes through the upper die assembly to be slidably connected to the upper die assembly, and dislocation during die assembly is avoided when the guide rod passes through the guide rod.

Description

Felt forming die Technical Field The utility model relates to the technical field of felt forming, in particular to a felt forming die. Background The felt forming process is used as a high-efficiency three-dimensional fiber product processing technology and is widely applied to the fields of automotive interiors, electronic equipment sealing parts and the like. The basic process of the traditional technology is that a felt sheet is placed between an upper die and a lower die, the edge of the sheet is mechanically locked by a rigid blank holder, and then a cavity is filled by heating and softening a material and applying pressure, so that a target structure is finally formed. The method has good forming effect on the shallow cavity or the uniform stretching structure, but the process contradiction is increasingly prominent when facing the deep cavity or the complex structure of the deep cavity and the shallow cavity. With the increasing functional demands of products, felt products often need to integrate different depth cavity structures (e.g., nested shallow cavities within deep cavities) in the same component. When the composite structure is formed, the material needs to undergo multistage stretching deformation, the traditional rigid blank holder technology has obvious defects in the scene, the complete constraint of the blank holder on the edge of the sheet material in the deep cavity forming stage causes overlarge material flow resistance, fiber tearing and thickness rapid reduction are easy to occur in the deep cavity side wall area due to concentrated stretching stress, in addition, when the shallow cavity is formed in the deep cavity, the material needs to be subjected to secondary stretching in the plastic deformation area, at the moment, the fiber in the original deep cavity side wall area is changed, and the cracking risk in the shallow cavity forming is further increased. Disclosure of utility model In view of the defects in the prior art, the utility model provides a felt forming die: comprises a lower die assembly and an upper die assembly which are matched with each other; The lower die assembly comprises a lower bottom plate, a lower die and a lower die elastic block, wherein the lower die is fixedly arranged on the upper surface of the lower bottom plate, a first containing cavity penetrating through the upper end face and the lower end face is formed in the middle of the lower die, the lower die elastic block is embedded in the first containing cavity in a vertically sliding mode, and a restoring spring is arranged between the bottom of the lower die elastic block and the lower bottom of the lower die elastic block to form an elastic restoring mechanism. When the lower die elastic block is acted by external pressure, the lower die elastic block moves downwards along the first containing cavity and compresses the restoring spring, and after the pressure is relieved, the elastic restoring force of the restoring spring drives the lower die elastic block to reset to an initial position; The upper die assembly comprises an upper die, an upper die pressing plate and an upper die insert, wherein the upper die pressing plate is arranged below the upper die, a second containing cavity penetrating through the upper end face and the lower end face is formed in the middle of the upper die pressing plate, the upper die insert is embedded in the second containing cavity, the top of the upper die insert is rigidly connected with the upper die, and the bottom of the upper die insert extends to the lower surface penetrating through the second containing cavity and protruding out of the upper die pressing plate. Preferably, the top of the lower die elastic block is provided with a concave groove, and the bottom of the upper die insert is provided with a convex structure matched with the groove. Preferably, the top of the lower die elastic block is provided with a concave groove, and the bottom of the upper die insert is provided with a convex structure matched with the groove. Preferably, the upper die assembly comprises a limiting rod structure, the upper end of the limiting rod is rigidly fixed with the upper die, and the lower end extension section is provided with a limiting block with the diameter larger than that of the rod body. The upper die pressing plate is provided with a gradient through hole penetrating through the upper surface and the lower surface of the upper die pressing plate, the hole is of a stepped variable-diameter structure, a limiting rod penetrates through the gradient through hole to form sliding fit, and the upper die pressing plate is limited in stroke by abutting of a limiting block and a Kong Najie ladder face so as to prevent the upper die pressing plate from being separated from an upper die. Preferably, the device further comprises a guide rod, wherein the lower end of the guide rod is fixed with the lower die assembly, the upper end of the guide rod penetrates through the