Hot press forming tool for large concave coated products

Abstract

The utility model belongs to the field of mould frock, concretely relates to big concave surface cladding product hot press forming frock, including two base plates, a plurality of curved surface modules, three locking mechanisms, heating system, upper die and lower die, two base plates are fixed at the upper die top and lower die bottom respectively, be provided with the upper die kernel in the upper die and heating system is fixed in the upper die kernel inside, a plurality of curved surface modules are placed in the lower die and are spaced apart a plurality of curved surface modules, one locking mechanism is fixed in the upper die, two locking mechanisms are fixed in the lower die, three locking mechanisms fix the upper surface and both sides of a plurality of curved surface modules respectively. The utility model discloses through setting a plurality of slidable curved surface modules, make the product when hot pressing, big concave surface bottom also transfer to the pressure.

Description

Technical Field

[0001] This utility model belongs to the field of mold tooling, specifically relating to hot pressing tooling for products with large concave surfaces. Background Technology

[0002] Currently, for aesthetic reasons, automotive body panels are increasingly featuring deeper concave designs. Traditional molds have the following problems during the hot pressing process of body paneling: 1. Uneven heating in the concave area leads to poor curing of the adhesive in some areas; 2. Insufficient pressure transmission can easily lead to gaps in the bottom of the concave surface. Utility Model Content

[0003] To address the aforementioned problems in the existing technology, this utility model provides a hot pressing tooling for products with large concave surfaces. By setting several sliding curved surface modules, pressure is also transmitted to the bottom of the large concave surface during hot pressing.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a hot pressing forming fixture for large concave-faced products, comprising two substrates, several curved surface modules, three locking mechanisms, a heating system, an upper mold, and a lower mold. The two substrates are respectively fixed to the top of the upper mold and the bottom of the lower mold. An upper mold core is provided in the upper mold, and the heating system is fixed inside the upper mold core. Several curved surface modules are slidably spliced ​​and placed in the lower mold, with the several curved surface modules spaced apart. One locking mechanism is fixed to the upper mold, two locking mechanisms are fixed to the lower mold, and the three locking mechanisms respectively fix the top and sides of the several curved surface modules.

[0005] Furthermore, the heating system includes several heating tubes and several thermocouples, and several holes adapted to the heating tubes and thermocouples are opened in the upper mold core. The outer frame of the hot pressing forming fixture is provided with positioning pins and claws.

[0006] Compared with the prior art, the beneficial effects of this utility model are: this utility model solves the problem of uneven curing of deep concave surfaces by controlling temperature and pressure in a coordinated manner; the concave surface depth adaptability of this utility model is increased to twice that of traditional tooling for the first time, and the molding qualification rate is increased from 68% to more than 95%. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the overall structure of the tooling of this utility model; Figure 2 for Figure 1 Sectional view at point AA; Figure 3 Schematic diagram of hot-pressed product structure Figure 1 ; Figure 4 Schematic diagram of hot-pressed product structure Figure 2 ; Figure 5 for Figure 4 Sectional view at point BB. Detailed Implementation

[0008] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0009] Please see Figure 1-2 This utility model provides the following technical solution: a hot pressing forming fixture for large concave surface coated products, including two base plates 1, several curved surface modules 2, three locking mechanisms 3, a heating system 4, an upper mold, and a lower mold. The two base plates 1 are respectively fixed to the top of the upper mold and the bottom of the lower mold. Both base plates 1 are indirectly or directly connected to the pressure plate of the hydraulic press through connecting plates. The upper mold is provided with an upper mold core, and the heating system 4 is fixed inside the upper mold core. The heating system 4 is divided into multiple independently controlled units, which can dynamically adjust the temperature gradient according to the depth of the concave surface. The temperature at the bottom of the concave surface is higher than that at the edge. 5%-10%, several curved surface modules 2 are slidably spliced ​​in the lower mold and spaced apart. The curved surface modules 2 are slidable. The large concave area of ​​the product skeleton is placed on the curved surface modules 2. The spacing between the curved surface modules 2 is adjusted to adapt to concave surfaces with different curvatures. One locking mechanism 3 is fixed to the upper mold, two locking mechanisms 3 are fixed to the lower mold, and three locking mechanisms 3 respectively fix the top and sides of the curved surface modules 2. In this embodiment, the locking mechanism 3 is set as a hydraulic cylinder, which fixes and locks the curved surface modules 2.

[0010] Specifically, the heating system 4 includes several heating tubes and several thermocouples. The heating tubes and thermocouples are a set of independently temperature-controlled units. Each set of independently temperature-controlled units is distributed in areas corresponding to different parts of the product to control the temperature of different parts of the product during hot pressing. Several holes adapted to the heating tubes and thermocouples are opened in the upper mold core. The heating tubes are embedded in the holes and fixed with thermally conductive adhesive. The thermocouples are fixed by threads or directly inserted into the holes for real-time temperature monitoring. The outer frame of the hot pressing tooling is equipped with positioning pins and claws to accurately fix the plastic skeleton to be covered and prevent it from moving during the mold closing process.

[0011] Specifically, guide pillars are installed at the four corners of the lower mold, and guide sleeves corresponding to the guide pillars are set at the four corners of the upper mold. The guide pillars and guide sleeves are set to ensure that the upper and lower molds are precisely aligned during the mold closing process, preventing misalignment and damage to the product. Limiting pillars are set on the lower mold to control the final position of the mold closing, that is, to control the final covering thickness of the product and ensure consistent pressing depth.

[0012] like Figure 3-5 The diagram shows the structure of the product after thermoforming. The product is placed with the skeleton 5 facing down and the skin 6 facing up inside the mold. The skeleton 5 is made of PP-T20 material, and the skin 6 is made of 1mm PU / suede + 1mm PU foam. A 2.5-4mm 3D mesh is filled between the skeleton 5 and the skin 6 at the concave surface. Water-based adhesive is used.

[0013] The molding process of this utility model is as follows: The entire process is an integrated cycle of heating, pressure forming, and cooling and shaping.

[0014] 1. Tooling preheating: Start heating system 4 to heat the upper mold core to the preset temperature; 2. Install the covering skeleton 5: Place the covering skeleton 5 accurately in the mold frame of the lower mold. The large concave surface on the skeleton 5 corresponds to several curved surface modules 2. Then, fix the skeleton 5 firmly with the positioning pins and claws on the outer frame of the tooling.

[0015] 3. Start the hydraulic press, and the upper mold will begin to descend.

[0016] 4. The hydraulic press applies pressure and maintains the pressure for a period of time (pressure holding). The continuous heating of the upper mold keeps the surface 6 of the product plastic. At this time, each independently temperature-controlled unit on the heating system 4 monitors the temperature of each part of the product and independently controls the heating temperature. The temperature of the bottom of the concave surface of the product is 5%-10% higher than that of the edge.

[0017] 5. Turn off the heating and allow it to cool naturally, so that the temperature of the mold and the product drops and the film material solidifies and sets. After cooling to a certain temperature, the hydraulic press moves upward and the upper mold opens.

[0018] 6. Remove the covered component from the sliding curved surface module 2 of the lower mold. The operator performs a simple inspection to check the covering quality. Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hot pressing tooling for products with large concave surfaces, characterized in that: It includes two base plates (1), several curved modules (2), three locking mechanisms (3), a heating system (4), an upper mold and a lower mold. The two base plates (1) are fixed at the top of the upper mold and the bottom of the lower mold, respectively. The upper mold is provided with an upper mold core and the heating system (4) is fixed inside the upper mold core. Several curved modules (2) are slidably spliced ​​in the lower mold and the several curved modules (2) are spaced apart. One locking mechanism (3) is fixed in the upper mold and two locking mechanisms (3) are fixed in the lower mold. The three locking mechanisms (3) fix the top and sides of several curved modules (2) respectively.

2. The hot pressing forming fixture for large concave-faced products according to claim 1, characterized in that, The heating system (4) includes several heating tubes and several thermocouples. Several holes adapted to the heating tubes and thermocouples are respectively opened in the upper mold core. Positioning pins and claws are provided on the outer frame of the hot pressing forming tool.

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