CN111941021A - Slush molding die and manufacturing method thereof - Google Patents
Slush molding die and manufacturing method thereof Download PDFInfo
- Publication number
- CN111941021A CN111941021A CN202010801312.8A CN202010801312A CN111941021A CN 111941021 A CN111941021 A CN 111941021A CN 202010801312 A CN202010801312 A CN 202010801312A CN 111941021 A CN111941021 A CN 111941021A
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- manufacturing
- slush molding
- molding die
- die
- surface layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/38—Moulds, cores or other substrates
Abstract
The invention provides a slush molding mould and a manufacturing method thereof, wherein the method comprises the following steps of 1) manufacturing a mould shell blank by adopting a machining material reduction mode or a 3D printing material increase mode; 2) performing CNC (computer numerical control) machining on the die shell blank obtained in the step 1), and adjusting the thickness and the roughness of the die shell blank to obtain a shell layer of the die; 3) processing according to the following step 3.1) or step 3.2): step 3.1): processing on a surface of the case layer located on a cavity side of a mold to form a texture; step 3.2): manufacturing a surface layer on the surface of the shell layer positioned on one side of the cavity of the mold, then performing CNC (computer numerical control) machining on the surface layer, and then machining the surface layer to form a texture; 4) the glossiness of the textured surface is adjusted. Based on the method, the processing mode of the traditional slush molding die can be broken through by skillfully combining the steps, and the method is easier to widely implement and popularize.
Description
Technical Field
The invention relates to the field of skin molding, in particular to a manufacturing method of a mold for slush molding.
Background
With the continuous improvement of the requirement of people on the quality of the automotive interior, the slush molding with simple technical process and high-quality appearance is the coating process technology of the automotive interior widely applied and mature at present. The slush molding process is that the whole slush molding die with the leather grains is heated, the slush molding die and a powder box of slush molding powder are butted and then rotated, the plastic powder in the powder box naturally falls into the die to be melted, a skin with the leather grains, the shape of which is consistent with that of the die, is formed on the surface of the hot die, then the powder box is taken down, and the skin is manually taken down after the die is cooled.
Slush molding technology is a more advanced technology, and the molding technology is not complicated, but the equipment is expensive and the technical barrier is high. The mould used for slush molding is an electroforming mould. The current mainstream electroforming slush molding die manufacturing process is an electroforming process represented by foreign countries, and the main process flow of the traditional process is as follows: CNC wood pattern-manual cladding-reproduction silica gel mould 1-reproduction epoxy master mould-finishing of epoxy master mould-reproduction silica gel mould 2-reproduction epoxy-entering slot mould-pretreatment before electroforming-post treatment after electroforming-assembling and mould closing.
In a word, the existing slush molding die manufacturing process has a plurality of working procedures, and the technology is basically monopolized by foreign companies, so that the problems of high die cost, long development period and the like are caused.
Disclosure of Invention
In view of the above, the present invention provides a method for manufacturing a slush molding die different from the conventional electroforming process.
The invention provides a method for manufacturing a slush molding die, which comprises the following steps,
1) manufacturing a mould shell blank in a machining material reduction mode or a 3D printing material increase mode;
2) performing CNC (computer numerical control) machining (namely numerical control machining) on the die shell blank obtained in the step 1), and adjusting the thickness and the roughness of the die shell blank to obtain a shell layer of the die;
3) processing according to the following step 3.1) or step 3.2):
step 3.1): processing on a surface of the case layer located on a cavity side of a mold to form a texture;
step 3.2): manufacturing a surface layer on the surface of the shell layer positioned on one side of a cavity of a mold in a metal ion attachment mode or a 3D printing material increase mode, then performing CNC (computer numerical control) machining on the surface layer, adjusting the thickness and the roughness of the surface layer, and then machining the surface layer to form textures;
4) adjusting the gloss of the surface formed with the texture in step 3.1) or step 3.2).
In some embodiments, the shell layer is made of steel, nickel alloy, tungsten alloy or ceramic;
the surface layer is made of steel, nickel alloy, tungsten alloy or ceramic;
the shell layer and the surface layer are made of the same or different materials.
In some embodiments, the texture is formed in step 3.1) or step 3.2) using laser engraving or chemical etching.
In some embodiments, the slush molding die has a total thickness of 2 to 6mm with a tolerance of no more than 0.5 mm.
In some embodiments, the facing layer has a thickness of: 0.01mm < thickness <1 mm.
In some embodiments, the texture comprises a combination of one or more of geometric texture, technical texture, and false stitches.
In some embodiments, the metal ion attaching manner in step 3.2) is electroforming or electroplating.
In some embodiments, step 2) adjusts the roughness of the die housing blank to be Ra12.5 μm to Ra15 μm;
in step 3.2, the roughness of the surface layer is adjusted to Ra0.3-Ra0.8 μm.
In some embodiments, the slush molding die is provided with a stiffener rib structure formed when the die housing blank is manufactured in step 1).
The invention also provides a slush molding die prepared by the manufacturing method.
The technical scheme provided by the invention has the following beneficial effects:
the method for manufacturing the slush molding die is different from the existing electroforming process, and based on the method, the die is prepared by adopting a mechanical processing material reduction or 3D printing material increase mode. In addition, based on the manufacturing method of the invention, compared with the existing process of manufacturing by cladding and reversing, the design freedom degree of the fillet can be improved, the formed fillet is smaller, and the design freedom degree of the surface layer is favorably improved.
In addition, based on the method of the invention, the processing cost of the die forming process design is lower than that of the traditional electroforming process, so that the production cost can be saved.
Drawings
FIG. 1 is a schematic structural view of a slush molding die in one embodiment;
FIG. 2 is a schematic structural view of a slush molding die in another embodiment.
In the figure, 1-the shell layer; 2-surface layer; 3-reinforcing ribs; 4. a mold cavity; 5. powder box.
Detailed Description
In order to better understand the technical solution of the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
The invention provides a method for manufacturing a slush molding die, which mainly comprises the following steps,
1) manufacturing a mould shell blank by adopting a mechanical processing material reducing mode (namely material reducing processing forming) or a 3D printing material increasing mode;
2) performing CNC (computer numerical control) machining (namely numerical control machining) on the die shell blank obtained in the step 1), and adjusting the thickness and the roughness of the die shell blank to obtain a die shell layer 1;
3) processing according to the following step 3.1) or step 3.2):
step 3.1): processing to form a texture on the surface (or referred to as a-side) of the shell layer 1 on the cavity 4 side of the mold;
step 3.2): manufacturing a surface layer 2 on the surface (or called as A surface) of a shell layer 1 positioned on one side of a cavity 4 of a mold by adopting a metal ion attachment mode or a 3D printing material increase mode, then carrying out CNC (computer numerical control) machining on the surface layer 2, adjusting the thickness and the roughness of the surface layer 2, and then processing the surface layer 2 to form textures;
4) the glossiness of the textured surface is adjusted.
Wherein if the processing according to step 3.1) in step 3) is carried out, then step 4) is carried out, the structural schematic diagram of the obtained slush molding die is shown in FIG. 2, namely only the shell layer 1 and no surface layer. And if the processing is carried out according to the step 3.2) in the step 3), and then the step 4) is carried out, the structural schematic diagram of the obtained slush molding die is shown in figure 1, namely the slush layer 1 and the surface layer 2 are included. The person skilled in the art can choose whether to add the facing layer 2 according to the requirements of strength and/or wear resistance, for example, if the shell layer alone cannot meet the requirements of specific strength or wear resistance, the performance of the mold can be improved by adding the facing layer. In addition, the shell layer can also be made of cheaper materials, so that the cost of the die is reduced.
The material of the shell layer 1 may be a metal material or a non-metal material, preferably a high temperature resistant and heat conductive material, and any material suitable for machining in a material reduction manner or a 3D printing material increase manner may be used, which is not particularly limited. For example, in some embodiments, the material of the shell layer is steel, nickel alloy, tungsten alloy, or ceramic.
The material of the surface layer 2 may be a metal material or a non-metal material, and any material suitable for processing by a metal ion attachment method or a 3D printing additive method may be used, and is not particularly limited. The material of the surface layer 2 is preferably a high temperature resistant and heat conductive material, and in some embodiments, the material of the surface layer may be steel, nickel alloy, tungsten alloy, or ceramic. Further, the materials of the shell layer 1 and the surface layer 2 can be the same or different.
In step 3.1) or step 3.2), the texture may be formed by laser engraving or chemical etching. Laser engraving or chemical etching are well known processing means to those skilled in the art and will not be described in detail. In step 3), the texture formed is not particularly limited, and a desired texture pattern, such as a texture pattern forming one or more of geometric texture, scientific texture, and false stitches, may be formed according to the product requirements.
The phrase "on the cavity side of the mold" means that the mold cavity 4 is located on the same side as the outer space of the mold cavity 4.
In step 4), the surface with the texture is subjected to glossiness adjustment, and a specific value of the glossiness can be determined according to the product target requirement, and the glossiness adjustment is mainly used for meeting the part glossiness requirement. The gloss can be, for example, 1 to 3.5 °. The way of adjusting the gloss is well known in the art, for example by sandblasting on the texture.
Based on the method of the invention, the slush molding mould with thinner thickness or thicker thickness can be obtained, and the slush molding mould can be flexibly carried out according to the requirement of the mould. However, in the prior art, the electroforming technology is adopted, and a very thick/thin mold cannot be obtained due to the limitation of the electroforming technology. The novel process of the invention adopts an additive or subtractive mode, so that the range of the thickness bandwidth which can be obtained is large. In some embodiments, the slush molding die has a total thickness of 2 to 6 mm. By adopting the manufacturing method, a product with a smaller tolerance value than that of the traditional process can be obtained, a slush molding mould with the thickness tolerance not exceeding 0.5mm can be obtained, the smaller tolerance means more uniform, the slush molding mould can be heated more uniformly during molding, and the molded surface skin has better quality. However, the prior art depends on the electroforming process, but the limitation of the electroforming process can cause that products with smaller tolerance can not be obtained, because in the sharp-angled region of the part shape or the current concentration region, the thickness of the electroformed mould can have larger difference due to the non-uniformity of the current during electroforming; and the thicker the mold thickness, the more uneven the electroforming. The new process provided by the invention can overcome the defects.
In some embodiments, the thickness of the surface layer 2 may be determined according to actual product requirements, and the invention introduces machining modes such as a mechanical processing material reduction mode or a 3D printing material increase mode, and the thickness may be: 0.01mm < thickness <1 mm.
In some embodiments, the metal ion attachment means in step 3.2) is conventional electroforming or electroplating.
In some embodiments, step 2) adjusts the roughness of the die housing blank to be Ra12.5 μm-Ra15 μm. The roughness is adjusted, for example, by grinding.
In the step 3.2, the roughness of the surface layer 2 is adjusted to Ra0.3-Ra0.8 μm, and the corresponding roughness can be adjusted by grinding.
In some embodiments, the slush molding die is provided with reinforcing ribs 3, i.e., reinforcement portions; specifically, the rib structure is formed when the die case blank is manufactured in step 1), that is, the rib is formed together when the die case blank is manufactured by a machining material reduction method or a 3D printing material increase method.
In some embodiments, after the die housing blank is machined, for example, CNC machining, heat treatment, stress relief, and grinding are also included. These treatments are all well known in the art, the purpose of the heat treatment being to adjust the hardness of the mould, the stress relief being to control the deformation of the mould; the roughness can be adjusted by polishing, and the specific treatment means are conventional technical means in the manufacturing field and are not described in detail. In some embodiments, after the CNC machining of the surface layer is performed in step 3.2), the processes of polishing, wall thickness measurement, wall thickness adjustment and the like can be further included, and the roughness can be controlled by polishing; these specific processing means are also conventional technical means in the manufacturing field, and are not described in detail herein.
In the manufacturing method provided by the invention, specific single processing means such as a machining material reduction mode, a 3D printing material adding mode, a CNC (computer numerical control) processing mode and the like are all conventional processing technologies in the field of mechanical manufacturing. The invention is not in improvement of specific processing means used in the manufacturing process, and one key point of the invention is that the existing conventional processing means is skillfully utilized and combined according to a specific step sequence to form a set of slush-molding die manufacturing method different from the electroforming manufacturing process of the existing slush-molding die, thereby breaking through the technical barrier of the electroforming process, providing the slush-molding die manufacturing process which is easier to implement, popularize and apply, and improving the degree of freedom of die manufacturing.
It will be appreciated by those skilled in the art that modifications or adaptations to the invention may be made in light of the teachings of the present specification. Such modifications or adaptations are intended to be within the scope of the present invention as defined in the claims.
Claims (10)
1. A method for manufacturing a slush molding die is characterized by comprising the following steps,
1) manufacturing a mould shell blank in a machining material reduction mode or a 3D printing material increase mode;
2) performing CNC (computer numerical control) machining on the die shell blank obtained in the step 1), and adjusting the thickness and the roughness of the die shell blank to obtain a shell layer of the die;
3) then processing is carried out according to the following step 3.1) or step 3.2):
step 3.1): processing on a surface of the case layer located on a cavity side of a mold to form a texture;
step 3.2): manufacturing a surface layer on the surface of the shell layer positioned on one side of a cavity of a mold in a metal ion attachment mode or a 3D printing material increase mode, then performing CNC (computer numerical control) machining on the surface layer, adjusting the thickness and the roughness of the surface layer, and then machining the surface layer to form textures;
4) adjusting the gloss of the surface formed with the texture in step 3.1) or step 3.2).
2. The slush molding die manufacturing method according to claim 1, wherein the material of the shell layer is steel, nickel alloy, tungsten alloy, or ceramic;
the surface layer is made of steel, nickel alloy, tungsten alloy or ceramic;
the shell layer and the surface layer are made of the same or different materials.
3. The slush molding die manufacturing method according to claim 1 or 2, characterized in that in step 3.1) or step 3.2), the texture is formed by laser engraving or chemical etching.
4. The slush molding die manufacturing method according to any one of claims 1 to 3, wherein the slush molding die has a total thickness of 2 to 6mm and a tolerance of not more than 0.5 mm.
5. The slush molding die manufacturing method according to claim 4, wherein the thickness of the surface layer is: 0.01mm < thickness <1 mm.
6. The slush molding apparatus manufacturing method according to any one of claims 1 to 5, wherein the texture includes one or a combination of geometric texture, scientific texture, and false stitches.
7. The slush molding die manufacturing method according to any one of claims 1 to 6, wherein the metal ion attachment means in step 3.2) is electroforming or plating.
8. The slush molding die manufacturing method according to any one of claims 1 to 7, wherein in step 2), the roughness of the die case blank is adjusted to Ra12.5 μm to Ra15 μm;
in step 3.2, the roughness of the surface layer is adjusted to Ra0.3-Ra0.8 μm.
9. Slush molding die manufacturing method according to any one of claims 1 to 8, characterized in that the slush molding die is provided with reinforcing ribs, which reinforcing rib structure is formed when manufacturing the die case blank in step 1).
10. A slush molding die obtained by the manufacturing method according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010801312.8A CN111941021A (en) | 2020-08-11 | 2020-08-11 | Slush molding die and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010801312.8A CN111941021A (en) | 2020-08-11 | 2020-08-11 | Slush molding die and manufacturing method thereof |
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| CN111941021A true CN111941021A (en) | 2020-11-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0475004B1 (en) * | 1990-09-14 | 1995-06-21 | Benecke-Kaliko Aktiengesellschaft | Process for manufacturing multi-coloured skins by slush moulding, mold and cutting device for carrying out the process |
| CN102575332A (en) * | 2009-06-11 | 2012-07-11 | 福特汽车公司 | Low CTE slush molds with textured surface, and method of making and using the same |
| CN105121142A (en) * | 2013-03-13 | 2015-12-02 | 帝斯曼知识产权资产管理有限公司 | Systems and method for producing three-dimensional articles from flexible composite materials |
| CN107723754A (en) * | 2017-10-17 | 2018-02-23 | 天津汇友连众精密模具有限公司 | A kind of miniature slush mold preparation technology |
| CN109396778A (en) * | 2018-12-07 | 2019-03-01 | 上汽通用五菱汽车股份有限公司 | A kind of mould manufacturing method that vehicle exterior cladding element crest line sharpens |
| CN109435215A (en) * | 2018-11-09 | 2019-03-08 | 延锋汽车饰件模具技术有限公司 | A kind of female mould vacuum forming mold and its manufacturing process |
-
2020
- 2020-08-11 CN CN202010801312.8A patent/CN111941021A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0475004B1 (en) * | 1990-09-14 | 1995-06-21 | Benecke-Kaliko Aktiengesellschaft | Process for manufacturing multi-coloured skins by slush moulding, mold and cutting device for carrying out the process |
| CN102575332A (en) * | 2009-06-11 | 2012-07-11 | 福特汽车公司 | Low CTE slush molds with textured surface, and method of making and using the same |
| CN105121142A (en) * | 2013-03-13 | 2015-12-02 | 帝斯曼知识产权资产管理有限公司 | Systems and method for producing three-dimensional articles from flexible composite materials |
| CN107723754A (en) * | 2017-10-17 | 2018-02-23 | 天津汇友连众精密模具有限公司 | A kind of miniature slush mold preparation technology |
| CN109435215A (en) * | 2018-11-09 | 2019-03-08 | 延锋汽车饰件模具技术有限公司 | A kind of female mould vacuum forming mold and its manufacturing process |
| CN109396778A (en) * | 2018-12-07 | 2019-03-01 | 上汽通用五菱汽车股份有限公司 | A kind of mould manufacturing method that vehicle exterior cladding element crest line sharpens |
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Application publication date: 20201117 |