Production mold preparation method and flow guide cover preparation method

Abstract

The invention discloses a production mold preparation method and an air deflector preparation method, and belongs to the technical field of air deflectors. The production mold preparation method comprises the steps that an initial mold is prepared; coating a mold turnover surface of the initial mold with a release agent, paving a plurality of layers of fiber resin mixtures after the release agent is dried, and demolding after the fiber resin mixtures are cured to obtain a rough mold; and the rough mold is trimmed to obtain the production mold. The preparation method of the flow guide cover comprises the following steps: preparing one or more production molds by adopting the method; the product area of the production mold is coated with a release agent, after the release agent is completely dried, a plurality of layers of forming materials are laid on the product area of the production mold, demolding is conducted after curing, and a fairing blank is obtained; and the fairing blank is subjected to edge cutting and surface repairing and polishing treatment, and then the fairing is obtained. Compared with a traditional machining production mold preparation mode, the method has the advantages that the preparation rate of a single production mold can be obviously increased, so that the batch production of the production mold is met, and a large temporary order is effectively dealt with.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fairing, in particular to a production mold preparation method and a fairing preparation method. BACKGROUND

[0002] Currently, the market competition of commercial vehicles is fierce. For dump trucks and some tractors, the installation rate of fairings is not high. If the fairing is not developed, part of the market will be lost. If the fairing is developed and a steel mold is prepared, the investment is large, and the product appearance cannot be updated and iterated in a short period of time, and gradually loses competitiveness in the fierce market competition. Therefore, some vehicle manufacturers will machine a temporary and simple mold, and prepare the fairing by hand lay-up molding. This method has a small investment, does not lose the market demand for fairings, and can update and iterate the appearance according to the market, but the only disadvantage of the machining mold method is that a large number of one-time orders cannot be quickly machined in a short period of time to expand production capacity to cope with large orders. SUMMARY

[0003] The purpose of the present application is to solve the above technical problems, and provide a production mold preparation method and a fairing preparation method. The present application first machines an initial mold, and then uses the initial mold to prepare a production mold by hand lay-up molding (pasting several layers of fiber resin mixture). Compared with the traditional machining method for preparing a production mold, the preparation rate of a single production mold can be significantly improved, thereby meeting the batch production of production molds, effectively coping with temporary large orders, and solving the problem of significantly delayed product delivery.

[0004] To achieve the above purpose, the present application provides the following scheme: the present application discloses a production mold preparation method, comprising the following steps: preparing an initial mold; applying a release agent to the mold surface of the initial mold, and after the release agent is dried, pasting several layers of fiber resin mixture on the mold surface of the initial mold, and after the fiber resin mixture is cured, a rough mold is obtained by demolding; finishing the rough mold to obtain a production mold.

[0005] Preferably, the finishing process comprises the following steps: scraping putty on the area where the cavity surface of the rough mold is defective, drying, and then polishing the entire cavity surface.

[0006] Preferably, the fiber resin mixture pasting process adopts the method of pasting one layer of fiber cloth and brushing one layer of resin glue, or adopts the method of pasting fiber pre-impregnated material.

[0007] Preferably, the method further comprises the following step: locally embedding metal bars during the fiber resin mixture pasting process.

[0008] Preferably, the initial mold is prepared by machining.

[0009] Preferably, the material of the initial mold is epoxy wood, polyurethane wood, unsaturated resin wood or aluminum.

[0010] Preferably, the curing temperature of the fiber resin mixture is room temperature or oven curing at no more than 65 DEG C, and the curing time is 60 min to 120 min.

[0011] The application also discloses a method for preparing a fairing, comprising the following steps: One or more production molds for producing the fairing are prepared by the production mold preparation method. A release agent is applied to the product area of the cavity surface of the production mold, and after the release agent is completely dried, a plurality of layers of molding material are laid on the product area of the cavity surface of the production mold, and after curing, the fairing blank is released. The fairing is obtained after trimming, surface repair and polishing of the fairing blank.

[0012] Preferably, the turning surface of the initial mold comprises a mold turning edge area, a mold excess area, a mold groove line and a mold profile area arranged in sequence from the outer edge to the inside; the cavity surface of the production mold obtained from the initial mold comprises a mold reinforcing area and a product area, the product area comprises a product excess area, a product protrusion line and a product profile area, and the mold reinforcing area, the product excess area, the product protrusion line and the product profile area are arranged in sequence from the outer edge to the inside.

[0013] Preferably, the curing temperature of the molding material is room temperature to 120 DEG C, and the curing time is 30 min to 120 min.

[0014] The application has the following technical effects compared with the prior art: The core point of the application is to prepare an initial mold first, and then use the initial mold to prepare a production mold by hand lay-up molding (laying a plurality of layers of fiber resin mixture), which can significantly improve the preparation rate of a single production mold compared with the machining method, so that more production molds can be prepared in a short time, temporary large orders can be handled, the preparation efficiency of the fairing is improved, the delivery time is shortened, and the mold preparation cost is greatly reduced. The production mold preparation method is not limited to the fairing of a vehicle, but can also be applied to other exterior parts of a vehicle, such as a hydrogen bottle cover, a battery skin, a side skirt and other products that are updated and iterated faster. This method has a small investment, can be updated and iterated at any time, has a wide application prospect and commercial value. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0016] Figure 1 Fig. 1 is a perspective view of the turning surface of the initial mold in the embodiment of the present application; Figure 2 Fig. 2 is a partial enlarged view of position A of the initial mold in the embodiment of the present application; Figure 1 Figure 3 Fig. 3 is a partial enlarged view of position B of the initial mold in the embodiment of the present application; Figure 1 Figure 4 Fig. 4 is a side view of the initial mold in the embodiment of the present application; Figure 5 Fig. 5 is a partial enlarged view of position C of the initial mold in the embodiment of the present application; Figure 4 Figure 6 Fig. 6 is a front view of the initial mold in the embodiment of the present application; Figure 7 Fig. 7 is a top view of the initial mold in the embodiment of the present application; Figure 8 Fig. 8 is a perspective view of the cavity surface of the production mold in the embodiment of the present application; Figure 9 Fig. 9 is a partial enlarged view of position D of the production mold in the embodiment of the present application; Figure 8 Figure 10 Fig. 10 is a perspective view of the back surface of the production mold in the embodiment of the present application; Figure 11 Fig. 11 is a perspective view of the outer surface of the fairing in the embodiment of the present application; Figure 12 Fig. 12 is another perspective view of the outer surface of the fairing in the embodiment of the present application; Figure 13 Fig. 13 is a perspective view of the inner surface of the fairing in the embodiment of the present application.

[0017] Legend of reference signs: 1, initial mold; 10, turning surface; 101, mold turning edge area; 102, mold excess area; 103, mold groove line; 104, mold surface area; 2, production mold; 20, cavity surface; 201, mold reinforcing area; 202, product area; 2021, product excess area; 2022, product protrusion line; 2023, product surface area;​​​​ 3. Draft shield; 301. Arc-shaped draft guide; 302. Vertical plate support. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a method for preparing production molds and a method for preparing air guides to solve the problems existing in the prior art. Multiple production molds are prepared by hand lay-up of the initial mold, and air guides are prepared by the molds. This not only reduces the cost of molds, but also can cope with large temporary orders.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 like Figures 1 to 13 As shown, this embodiment provides a method for preparing a production mold, including the following steps: preparing an initial mold 1; applying a release agent to the mold-turning surface 10 of the initial mold 1; after the release agent is completely dry, laying several layers of fiber resin mixture on the mold-turning surface 10 of the initial mold 1; after the fiber resin mixture is cured, demolding to obtain a rough mold; and trimming the rough mold to obtain a production mold 2.

[0022] This application only requires the fabrication of an initial mold 1, followed by a production mold 2 for preparing the fairing 3. This production mold 2 is prepared via hand lay-up molding (laying several layers of fiber-resin mixture). Compared to direct machining of the production mold 2, hand lay-up molding allows for rapid fabrication of the production mold 2, increasing the speed of individual production molds and thus accelerating mass production. This addresses the problem of insufficient production capacity due to the slow speed of machining the production mold 2, which is unable to handle large, temporary orders and leads to significant delays in product delivery. Furthermore, while developing a formal steel mold and using SMC molding technology for mass production of the fairing is also highly efficient, the mold cost is prohibitively high. Hand lay-up molding of the production mold 2 can significantly reduce costs.

[0023] In one embodiment, the finishing process includes the following steps: applying putty to the defective areas of the cavity surface of the rough mold, sanding after drying, and finally polishing the entire cavity surface. The defects in these areas are mainly air bubbles accumulated during molding, which appear as missing glue holes after demolding.

[0024] In an embodiment, the fiber resin mixture is laid in two ways, one is to lay a layer of fiber cloth and brush a layer of resin glue, and the other is to directly lay a fiber prepreg. The fiber cloth is carbon fiber cloth, quartz fiber cloth or glass fiber cloth (glass fiber), and the glass fiber cloth is relatively cheap. The resin glue is epoxy resin or unsaturated resin. The number of layers of the fiber resin mixture is related to the thickness of a single layer of the fiber resin mixture (usually 0.1 mm or 0.2 mm layer thickness) and the thickness of the production mold 2, and the thickness of the production mold 2 is designed in relation to the design stiffness (or design strength) of the production mold 2. The fiber prepreg is an epoxy quartz fiber prepreg, an epoxy glass fiber prepreg or an epoxy carbon fiber prepreg. The fiber prepreg is formed into a sheet.

[0025] In an embodiment, the method further comprises the step of: embedding metal bars locally during the laying of the fiber resin mixture to improve the structural strength of the production mold 2. The metal bars are pre-set at the places where the structural strength of the production mold 2 needs to be improved.

[0026] In an embodiment, the metal bars are in the shape of a cylinder or a sheet. The cylindrical metal can be a cylinder with a diameter of 0.5 mm to 3 mm. The sheet metal bar can be a metal sheet with a thickness of 0.5 mm to 3 mm.

[0027] In an embodiment, the initial mold 1 is prepared by machining.

[0028] In an embodiment, the material for making the initial mold 1 is epoxy wood, polyurethane wood, unsaturated resin wood or aluminum.

[0029] In an embodiment, the curing temperature of the fiber resin mixture is room temperature or oven curing at a temperature not exceeding 65°C, and the curing time is 60 min to 120 min.

[0030] Example 2 As shown in Figures 1 to 13 The embodiment provides a method for preparing a fairing, which comprises the following steps: One or more production molds 2 for producing the fairing 3 are prepared by the production mold preparation method in Example 1: a release agent is applied to the product area 202 of the cavity surface 20 of the production mold 2, and after the release agent is completely dried, a plurality of layers of molding material are laid on the product area 202 of the cavity surface of the production mold 2, and after curing, the fairing blank is demolded; the fairing blank is subjected to edge cutting, surface repair and polishing treatment to obtain the fairing 3.

[0031] The traditional scheme is generally to machine a production mold 2 to prepare the fairing 3. The core point of the application is to optimize the production mold 2 by machining an initial mold 1; thus, more simple molds of the fairing can be prepared in a short time, temporary large orders can be coped with, the preparation efficiency of the fairing is improved, the delivery time is shortened, and the mold preparation cost is greatly reduced.

[0032] In an embodiment, the turning mold surface 10 of the initial mold 1 comprises, from the outer edge to the inside, a mold turning edge area 101, a mold allowance area 102, a mold groove line 103, and a mold profile area 104. The cavity surface 20 of the production mold 2 obtained according to the initial mold 1 comprises a mold reinforcing area 201 and a product area 202, the product area 202 further comprises a product allowance area 2021, a product raised line 2022, and a product profile area 2023, which are sequentially arranged from the outer edge to the inside. The mold reinforcing area 201 corresponds to the mold turning edge area 101, and the mold reinforcing area 201 is also a turning edge structure because the mold turning edge area 101 is a machined turning edge, so that the rigidity of the production mold 2 can be improved. The product allowance area 2021 corresponds to the mold allowance area 102, and the product profile area 2023 corresponds to the mold profile area 104. During production of the fairing 3, the main laying is the laying of the product allowance area 2021, the product raised line 2022, and the product profile area 2023, so that the product profile area 2023 corresponds to the actual design size of the fairing 3, and the product allowance area 2021 corresponds to the part to be cut off during edge cutting of the fairing 3. The product raised line 2022 corresponds to the mold groove line 103, and the product raised line 2022 is a raised glue line formed after glue flows into the mold groove line 103. In the later production of the fairing 3, a groove line that can be recognized by the naked eye will be formed on the fairing blank through the product raised line 2022, and the product raised line 2022 provides a cutting reference during edge cutting (cutting off the excess part of the fairing 3 formed by the product profile area 2023). The mold groove line 103 and the product raised line 2022 are both annular lines.

[0033] In an embodiment, the mold groove line 103 on the initial mold 1 is a groove with a width of 2 mm and a depth of 2 mm. The thickness of the production mold 2 is 8 mm to 15 mm, the product raised line 2022 is a glue accumulation raised line with a width of 2 mm and a depth of 2 mm, and the thickness of the fairing 3 is 3 mm to 5 mm.

[0034] In an embodiment, the fairing 3 comprises an arc-shaped fairing part 301 and vertical plate support parts 302 located on both sides of the arc-shaped fairing part 301. The shape of the product profile area 2023 of the corresponding production mold 2 matches the shape of the fairing 3. The shape of the mold profile area 104 on the initial mold 1 matches the shape of the product profile area 2023 of the production mold 2.

[0035] In an embodiment, the curing temperature of the molding material is room temperature to 120°C, and the curing time is 30 min to 120 min.

[0036] In an embodiment, the material of the fairing 3 is a fiber-resin mixture. The fiber-resin mixture is used in two ways. One is to use a fiber cloth-resin mixture, that is, to paste a layer of fiber cloth and brush a layer of resin glue in the same way as the production mold 2. The fiber cloth is made of carbon fiber cloth, quartz fiber cloth or glass fiber cloth (glass fiber). The glass fiber cloth is cheaper. The resin glue is epoxy resin or unsaturated resin. The other is to use fiber fiber prepreg. The fiber prepreg is epoxy quartz fiber prepreg, epoxy glass fiber prepreg or epoxy carbon fiber prepreg. The fiber prepreg is a sheet formed by molding.

[0037] In an embodiment, metal bars can be pasted in the areas that need to be reinforced when the fairing 3 is molded and pasted.

[0038] The principles and embodiments of the present application are described by using specific examples. The above examples are only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific embodiments and application scope can be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method of producing a mold preparation, characterized by, The method comprises the following steps: preparing an initial mold; applying release agent to the turning mold surface of the initial mold, and after the release agent is dried, laying several layers of fiber resin mixture on the turning mold surface of the initial mold, and after the fiber resin mixture is cured, the rough mold is obtained by releasing the mold; finishing the rough mold to obtain a production mold.

2. The production mold preparation method according to claim 1, wherein The finishing process comprises the following steps: scraping putty on the cavity surface of the rough mold in the defective area, drying, and finally polishing the entire cavity surface.

3. The production mold preparation method according to claim 1 or 2, characterized by, During the laying process of the fiber resin mixture, a layer of fiber cloth is laid and a layer of resin glue is brushed, or a fiber preform is laid.

4. The production mold preparation method according to claim 1, characterized by, The method further comprises the following steps: During the laying process of the fiber resin mixture, a metal bar is partially embedded.

5. The production mold preparation method according to claim 1, wherein The initial mold is prepared by machining.

6. The method of claim 1 or 5, wherein The material of the initial mold is epoxy wood, polyurethane wood, unsaturated resin wood or aluminum.

7. The production mold preparation method according to claim 1, wherein The curing temperature of the fiber resin mixture is room temperature or oven curing at a temperature not exceeding 65°C, and the curing time is 60min-120min.

8. A method of manufacturing a fairing, characterized by, The method comprises the following steps: using the production mold preparation method of any one of claims 1-7 to prepare one or more production molds for producing a fairing; applying release agent to the product area of the cavity surface of the production mold, and after the release agent is completely dried, laying several layers of molding material on the product area of the cavity surface of the production mold, and after curing, releasing the mold to obtain a fairing blank; after the fairing blank is subjected to edge cutting and surface repair and polishing treatment, a fairing is obtained.

9. The method of claim 8, wherein, The turning mold surface of the initial mold comprises, from the outer edge to the inside, a mold turning edge area, a mold excess area, a mold groove line, and a mold surface area; the cavity surface of the production mold obtained from the initial mold comprises a mold reinforcing area and a product area, the product area comprises a product excess area, a product protrusion line, and a product surface area, and the mold reinforcing area, the product excess area, the product protrusion line, and the product surface area are arranged in order from the outer edge to the inside.

10. The method of claim 9, wherein The curing temperature of the molding material is room temperature to 120°C, and the curing time is 30min-120min.

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