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CN-122007261-A - Preparation method of insert of hot stamping forming die and hot stamping forming die

CN122007261ACN 122007261 ACN122007261 ACN 122007261ACN-122007261-A

Abstract

The invention provides a preparation method of a hot stamping forming die insert and a hot stamping forming die, wherein the preparation method of the hot stamping forming die insert comprises the following steps of carrying out rough machining on an obtained insert matrix to enable the obtained insert matrix to be roughly formed into a molded surface, a cooling water channel and a main vent hole; forming an R angle between two adjacent molded surfaces, forming the R angle into a plane with a preset angle between the two adjacent molded surfaces, forming a plurality of first holes on an insert substrate formed with the plane, enabling any one of the first holes to extend from the plane to the inside of the insert substrate and be communicated with a main vent hole, enabling the plane to be recessed inwards to form a groove part with a groove depth smaller than that of the first holes, applying a filling layer on the groove part to enable the groove part to be restored to the R angle between the two adjacent molded surfaces correspondingly, enabling the filling layer to be provided with a plurality of second holes penetrating through the filling layer along the thickness direction and communicated with the first holes, enabling the aperture of the second holes to be smaller than that of the first holes, and polishing the insert substrate applied with the filling layer after finishing the insert substrate, so as to obtain the hot stamping forming die insert.

Inventors

  • AN JIAN
  • CHEN HANJIE
  • ZHU ZHENGLONG

Assignees

  • 苏州普热斯勒科技集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260126

Claims (10)

  1. 1. The preparation method of the hot stamping forming die insert is characterized by comprising the following steps of: Carrying out rough machining on the obtained insert matrix to form molded surfaces, and cooling waterways and main vent holes in the molded surfaces; Forming the R angle into a plane, wherein a preset angle is formed between the plane and two adjacent molded surfaces; Forming a plurality of first holes in the insert base body formed with a plane, wherein any one of the first holes extends from the plane to the inside of the insert base body and is communicated with the main vent hole; recessing the planar surface inwardly to form a trough portion having a trough depth less than a hole depth of the first hole; Applying a filling layer to the groove part so as to enable the groove part to be restored to an R angle between two adjacent molded surfaces correspondingly, wherein the filling layer is provided with a plurality of second holes, and any second hole penetrates through the filling layer along the thickness direction of the filling layer and is communicated with the first hole; finishing the insert substrate to which the filler layer is applied; and polishing the finished insert substrate to obtain the hot stamping forming die insert.
  2. 2. The method of making a hot stamping die insert as defined in claim 1, wherein at least one of the planar surfaces follows a transition path between adjacent two of the planar surfaces.
  3. 3. The method of manufacturing a hot stamping die insert according to claim 1, wherein in the step of forming a plurality of first holes in the insert base body formed with a plane, any one of the first holes extends from the plane to the inside of the insert base body to communicate with the main vent hole, the first holes are formed by CNC drilling or spark punching; the aperture of any of the first holes is 0.5mm-5mm, preferably 1mm; the plurality of first holes are arranged in an array, and the array spacing is 1-5 times of the aperture of the first holes.
  4. 4. The method of manufacturing a hot stamping die insert according to claim 1, wherein in the step of "recessing the plane inward to form a groove portion having a groove depth smaller than the hole depth of the first hole", the groove portion is preformed on the plane using a CNC machine tool, and the groove depth of the groove portion is 1mm to 2mm.
  5. 5. The method according to claim 1, wherein the step of applying a filling layer to the groove portion so that the groove portion is restored to an R angle between two adjacent mold surfaces, the filling layer being provided with a plurality of second holes, each of the second holes penetrating the filling layer in a thickness direction of the filling layer and communicating with the first hole, the second holes having a smaller pore diameter than the first hole, comprises the steps of: Plugging the first hole by using a high-temperature resistant material; Cladding a cladding layer on the groove part by laser, wherein the cladding layer protrudes out of the molded surface of the insert substrate by 0.5mm-2mm; Reducing the thickness of the cladding layer to reduce the cladding layer to a filling layer which is flush with the molded surface of the insert matrix, so that the groove part is correspondingly restored to an R angle between two adjacent molded surfaces; the filling layer is formed into a plurality of second holes by adopting a laser drilling mode, or, Acquiring a filling layer matched with the groove part in size; Fixedly connecting the filling layer in the groove part so as to enable the groove part to be restored to an R angle between two adjacent molded surfaces correspondingly; the filling layer is formed into a plurality of second holes by adopting a laser drilling mode, or, The method comprises the steps of obtaining a filling layer with the size matched with that of a groove part, wherein the filling layer is formed with a plurality of second holes in a laser mode, or forming a third hole in the groove part, wherein the third hole is coaxially arranged with the first hole and has the same extending direction as the first hole; Filling a gasket with the size matched with the third hole in the third hole so as to block the first hole, wherein the end face of the gasket, which faces away from the first hole, is flush with the bottom wall of the groove part; Cladding a cladding layer on the groove part by laser, wherein the cladding layer protrudes out of the molded surface of the insert substrate by 0.5mm-2mm; Reducing the thickness of the cladding layer to reduce the cladding layer to a filling layer which is flush with the molded surface of the insert matrix, so that the groove part is correspondingly restored to an R angle between two adjacent molded surfaces; Forming a plurality of second holes in the filling layer in a laser drilling mode, wherein the second holes penetrate through the gasket and are communicated with the first holes; and fixedly connecting the filling layer in the groove part so that the groove part is correspondingly restored to an R angle between two adjacent molded surfaces.
  6. 6. The method according to claim 1, wherein a filling layer is applied to the groove portion in the step of recovering the groove portion to an R angle between two adjacent mold surfaces, wherein the filling layer is provided with a plurality of second holes, each of the second holes penetrates through the filling layer in a thickness direction of the filling layer and is communicated with the first hole, and a hole diameter of the second hole is smaller than that of the first hole, wherein a hole diameter of any of the second holes is 0.1mm-1mm, preferably 0.1mm-0.5mm; The second holes are arranged in an array mode, and the array distance is 1-5 times of the aperture of the second holes.
  7. 7. The method of manufacturing a hot stamping die insert according to claim 1, wherein the step of polishing the finished insert substrate includes polishing the primary vent hole, the first air hole, and the second hole such that the surface roughness of the primary vent hole, the first air hole, and the second hole is less than Ra 1.0.
  8. 8. The method of manufacturing a hot stamping die insert according to claim 1, characterized in that the hardness of the obtained insert matrix is less than 55HRC, preferably 25HRC-35HRC.
  9. 9. A hot stamping die comprising a hot stamping die insert prepared by the method of preparing a hot stamping die insert according to claims 1 to 8.
  10. 10. The hot stamping die according to claim 9, wherein the pressure of the gas introduced into the main vent hole is in the range of 1MPa to 100MPa, preferably 20MPa to 70MPa, when the hot stamping die is used for hot stamping production.

Description

Preparation method of insert of hot stamping forming die and hot stamping forming die Technical Field The invention belongs to the technical field of mold preparation, and particularly relates to a preparation method of a hot stamping forming mold insert and a hot stamping forming mold. Background In the hot stamping process of the prior art, the blank can be contacted and rubbed with the R angle of the die insert, so that the surface of a part is scratched and the die is worn. At present, tesla is bent on a stainless steel part by utilizing an air pressure auxiliary bending forming technology, so that the part with no scratch on the surface is obtained. However, the R angle formed by the technology is only 1mm, and the formed R angle is generally linear. If very small holes are distributed on the R angle of the insert of the hot stamping die, then high-pressure gas is sprayed out of the holes to enable the hot stamped blank to be shaped under the force, and the surface of the hot stamped part can be theoretically free from strain. However, how to make fine micropores on the R angle of the hot stamping die insert is a problem which is worth discussing, for example, a CNC drilling or electric spark drilling mode is adopted, the minimum diameter can only reach 1mm, the smaller the aperture is, the more difficult to process, therefore, the two modes are utilized, the aperture can not reach the theoretical requirement, for example, the laser drilling mode is adopted, the aperture can reach 0.1mm at the minimum, but when the aperture reaches the lower limit, the formed Kong Shentong is always smaller than 2mm, and the thickness of the R angle of the hot stamping die insert is far more than 2mm. Disclosure of Invention In view of the above problems in the prior art, a primary object of the present invention is to provide a method for manufacturing a hot stamping die insert. The aim of the invention is achieved by the following technical scheme: the invention provides a preparation method of a hot stamping forming die insert, which comprises the following steps: Carrying out rough machining on the obtained insert matrix to form molded surfaces, and cooling waterways and main vent holes in the molded surfaces; Forming the R angle into a plane, wherein a preset angle is formed between the plane and two adjacent molded surfaces; Forming a plurality of first holes in the insert base body formed with a plane, wherein any one of the first holes extends from the plane to the inside of the insert base body and is communicated with the main vent hole; recessing the planar surface inwardly to form a trough portion having a trough depth less than a hole depth of the first hole; Applying a filling layer to the groove part so as to enable the groove part to be restored to an R angle between two adjacent molded surfaces correspondingly, wherein the filling layer is provided with a plurality of second holes, and any second hole penetrates through the filling layer along the thickness direction of the filling layer and is communicated with the first hole; finishing the insert substrate to which the filler layer is applied; and polishing the finished insert substrate to obtain the hot stamping forming die insert. As a further description of the above solution, along the transition path of the two adjacent profiles, the number of said planes is at least one. As a further description of the above technical solution, in the step of forming a plurality of first holes in the insert substrate formed with a plane, any one of the first holes extends from the plane to the inside of the insert substrate and is in communication with the main ventilation hole, the first holes are formed by adopting a CNC drilling or spark drilling method; the aperture of any of the first holes is 0.5mm-5mm, preferably 1mm; the plurality of first holes are arranged in an array, and the array spacing is 1-5 times of the aperture of the first holes. As a further description of the above technical solution, in the step of "recessing the plane inward to form a groove portion having a groove depth smaller than the hole depth of the first hole", the groove portion is preformed on the plane using a CNC machine, and the groove depth of the groove portion is 1mm to 2mm. As a further description of the above technical solution, in the step of applying a filling layer to the groove portion so as to restore the groove portion to an R angle between two adjacent molding surfaces, the filling layer is provided with a plurality of second holes, any one of the second holes penetrates through the filling layer in a thickness direction of the filling layer and is in communication with the first hole, and a hole diameter of the second hole is smaller than that of the first hole, the method specifically includes the following steps: Plugging the first hole by using a high-temperature resistant material; Cladding a cladding layer on the groove part by laser, wherein the cladding la