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CN-121989403-A - Method for forming automotive interior trim part by using polyurethane foam material

CN121989403ACN 121989403 ACN121989403 ACN 121989403ACN-121989403-A

Abstract

The application relates to a method for forming an automotive interior trim part by using a polyurethane foaming material. The method comprises the steps of forming a die cavity corresponding to the automotive interior part in a die, wherein the die cavity comprises a first sub-die cavity corresponding to a first structural part and a second sub-die cavity corresponding to a second structural part, the first sub-die cavity is communicated with the second sub-die cavity, preprocessing the die, closing the die, injecting foaming raw materials into the die cavity, enabling the foaming raw materials to flow and solidify in the first sub-die cavity and the second sub-die cavity to form an automotive interior part blank, opening the die, and taking out the automotive interior part blank. The method for forming the automotive interior trim part by using the polyurethane foaming material does not need secondary bonding, simplifies the processing technology of the automotive interior trim part, shortens the production period of the automotive interior trim part, is beneficial to improving the production efficiency, reduces the cost, improves the connection strength of the first structural part and the second structural part, and is beneficial to prolonging the service life of the automotive interior trim part.

Inventors

  • LIU YULONG
  • ZHANG SHOUKUAN
  • SUN LUMING

Assignees

  • 上海璟泰车业有限公司

Dates

Publication Date
20260508
Application Date
20260310

Claims (10)

  1. 1. A method for forming an automotive interior part made of polyurethane foam material is characterized by being used for forming the automotive interior part, wherein the automotive interior part comprises a first structural part and at least one second structural part, the second structural part is arranged on the first structural part and is connected with the first structural part, and the method for forming the automotive interior trim part by the polyurethane foaming material at least comprises the following steps: A die cavity corresponding to the automotive interior part is formed in the die, the die cavity comprises a first sub-die cavity corresponding to the first structural part and a second sub-die cavity corresponding to the second structural part, and the first sub-die cavity is communicated with the second sub-die cavity; Pretreating the die; Closing the die; injecting foaming raw materials into the die cavity, enabling the foaming raw materials to flow and solidify in the first sub-die cavity and the second sub-die cavity to form an automotive interior trim part blank, wherein the automotive interior trim part blank comprises the first structural part and at least one second structural part which are integrally formed; And opening the die and taking out the automotive interior trim blank.
  2. 2. The method for molding an automotive interior part of a polyurethane foam according to claim 1, wherein the pre-treating of the mold comprises at least the steps of: Spraying a release agent on the surface of the die cavity; preheating the die to a first preset temperature, and preserving heat for a first preset time period at the first preset temperature.
  3. 3. The method for forming an automotive interior part of a polyurethane foam material according to claim 2, wherein the first preset temperature is 50 ℃ to 60 ℃; and/or the first preset time length is 20s-60s.
  4. 4. The method for forming an automotive interior part of a polyurethane foam according to claim 1, wherein the curing of the foaming raw material in the cavity comprises at least the steps of: and preserving the heat of the die for a second preset time period at a first preset temperature.
  5. 5. The method for forming an automotive interior part made of a polyurethane foam according to claim 4, wherein the second preset time period is 140s to 180s.
  6. 6. The method of molding an automotive interior part made of a polyurethane foam according to any one of claims 1 to 5, wherein the second structural portion is configured with a first groove, or the second structural portion and the first structural portion are surrounded to form a first groove, an opening direction of the first groove faces a direction opposite to a second direction, the mold includes an upper mold, a lower mold, and a first slider, the upper mold and the lower mold are disposed opposite to each other in the first direction, and closing the mold at least includes: Sliding the first sliding block to a first preset position along a second direction and locking the first sliding block, wherein the first preset position corresponds to the first groove, and the second direction is perpendicular to the first direction; and closing the upper die and the lower die.
  7. 7. The method for forming an automotive interior part made of a polyurethane foam according to claim 6, wherein the method comprises the steps of opening the mold and taking out the automotive interior part blank, and further comprising at least the steps of: moving the first sliding block in the direction opposite to the second direction and separating from the first groove; Opening the upper die, and And taking the formed automotive interior trim part out of the die cavity.
  8. 8. The method for molding an automotive interior part made of a polyurethane foam according to any one of claims 1 to 5, wherein the second structural portion is configured with a first groove, or the second structural portion and the first structural portion are surrounded to form a first groove, and the automotive interior part further comprises a third structural portion configured with a second groove, wherein the opening directions of the first groove and the second groove face the opposite direction of the second direction; the die comprises an upper die, a lower die, a first sliding block and a second sliding block, and the die is clamped at least further comprises the following steps: moving the first sliding block to a first preset position along a second direction and locking the first sliding block, wherein the first preset position corresponds to the first groove, and the second direction is perpendicular to the first direction; moving the second sliding block to a second preset position along the first direction and locking the second sliding block, wherein the second preset position corresponds to the second groove; and closing the upper die and the lower die.
  9. 9. The method for forming an automotive interior part made of a polyurethane foam according to claim 8, wherein the step of opening the mold further comprises at least the steps of: moving the first sliding block in the direction opposite to the second direction and separating from the first groove; Moving the second slider in the direction opposite to the second direction and separating from the second groove; Opening the upper die, and And taking the formed automotive interior trim blank out of the die cavity.
  10. 10. The method for forming an automotive interior part made of a polyurethane foam according to claim 9, further comprising at least the steps of, after the formed automotive interior part blank is taken out of the cavity: Trimming and cleaning the automotive interior trim part blank to obtain the automotive interior trim part.

Description

Method for forming automotive interior trim part by using polyurethane foam material Technical Field The application relates to the technical field of manufacturing of automotive interior parts, in particular to a method for forming an automotive interior part by using a polyurethane foaming material. Background Along with the development of the automobile industry in the directions of light weight, energy conservation, environmental protection, cost reduction and efficiency enhancement, the material selection and the production process of the automobile interior trim parts become the key points of optimization. At present, after an injection molding part is adopted for automobile interior decoration, the injection molding part is pre-buried in a foaming mold, so that the injection molding part and the foaming part are connected in the foaming part molding process. However, the technological process is complex, two sets of molds, namely an injection mold and a foaming mold, are needed, and the cost is high. Disclosure of Invention In view of the above, it is necessary to provide a method for molding an automotive interior part of a polyurethane foam material. A method for forming an automotive interior part made of polyurethane foam material is used for forming the automotive interior part, the automotive interior part comprises a first structural part and at least one second structural part, the second structural part is arranged on the first structural part and is connected with the first structural part, and the method for forming the automotive interior trim part by the polyurethane foaming material at least comprises the following steps: A die cavity corresponding to the automotive interior part is formed in the die, the die cavity comprises a first sub-die cavity corresponding to the first structural part and a second sub-die cavity corresponding to the second structural part, and the first sub-die cavity is communicated with the second sub-die cavity; Pretreating the die; Closing the die; injecting foaming raw materials into the die cavity, enabling the foaming raw materials to flow and solidify in the first sub-die cavity and the second sub-die cavity to form an automotive interior trim part blank, wherein the automotive interior trim part blank comprises the first structural part and at least one second structural part which are integrally formed; And opening the die and taking out the automotive interior trim blank. The method for forming the automotive interior trim part by using the polyurethane foaming material can directly and integrally form the first structural part and the second structural part in the related technology, and can directly process the first structural part and the second structural part into the automotive interior trim part without prefabricating injection molding parts and embedding injection molding parts during processing foaming, so that the processing technology of the automotive interior trim part is simplified, the production period of the automotive interior trim part is shortened, the production efficiency is improved, and the die cost and the process cost are reduced. According to the embodiment, at least two parts of the automobile interior trim part are integrally formed, and the materials of the two parts are the same, so that the connection strength of the first structural part and the second structural part is improved, the service life of the automobile interior trim part is prolonged, the first structural part and the second structural part are directly molded and positioned, and the positioning accuracy is improved. In addition, in the related art, the second structure portion is usually pre-embedded in a mold, and the first structure portion is formed and connected with the second structure portion in a molding process, where the first structure portion is made of a foaming material, and the second structure portion is usually made of a structural material such as a conventional plastic, a metal, and the like, and the conventional plastic is typically made of a thermoplastic such as PP, ABS, POM, and is formed by injection molding. In this embodiment, the automotive interior part uses the foaming raw material to replace the traditional material of the related technology, so that the advantages of low density and light weight of the foaming raw material are utilized, the weight of the automotive interior part is reduced, the problem of bonding strength of the two materials is not needed to be considered, and the structural stability of the automotive interior part is improved. Alternatively, the foamed material is a two-component polyurethane material, one of which is a polyol component, such as, for example, modified diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate, and the other of which is an isocyanate component, which is a mixture of various adjuvants, such as catalysts, blowing agents, or crosslinking agents. In one embodiment, th