Blank forming method of molded product

Abstract

The blank forming method of the molded product comprises the following steps that S1, an inner mold is positioned in an outer mold, a mold cavity used for material filling exists between the outer wall of the inner mold and the inner wall of the outer mold, the inner mold and the outer mold are both models with openings in the same side, and the wall thicknesses of all positions, on the same plane, of the mold cavity are the same; s2, slurry is injected from the opening of the mold cavity to fill the whole mold cavity; and S3, after the slurry is cured, the outer mold is taken out, and a blank of a molded product is obtained. According to the invention, the stress of the whole product is uniform, and overheating caused by material gathering due to gliding of slurry at corners is avoided. And based on the technical scheme of the invention, the weight of each produced product is basically consistent, and the problem that the material needs to be supplemented every time due to weight deviation of the product is basically solved. Manual smearing is replaced with an inner mold auxiliary forming pouring technology, and the operation fool degree is higher; not only is the production efficiency improved, but also the requirement on the proficiency of technical workers is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of molded product production, and in particular to a blank forming method for a molded product. Background Art

[0002] At present, for the production of molded products, no matter whether the molded product is furniture or flower pot crafts, the operation method is still based on manual spreading - that is, applying mixed cement or other prepared inorganic gelling material surface and base material on the inside of the product mold, and then pasting the cloth, finishing and other operations. The mold can be removed only after the material solidifies for a certain period of time, and the blank molding of a product is preliminarily completed.

[0003] In the molding process, loading is one of the most important steps, because the quality of the entire product is largely related to the uniformity of the wall thickness. There is also a rigid requirement for the overall weight of the product that must be met by the customer, so it is really difficult to control this link. At present, in this regard, skilled workers can only rely on their experience to meet the requirements of uniform product wall thickness, and weight control can only be artificially reduced when the product blank is first loaded until the final demolding, and then the material is supplemented according to the actual weight error to meet the standard. In this way, the efficiency of production is greatly reduced, and even the required production capacity is affected. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above problems in the prior art, the present invention provides a method for forming a blank of a molded product.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a method for forming a blank of a molded product, comprising the following steps:

[0008] S1. Position the inner mold inside the outer mold so that there is a mold cavity for filling between the outer wall of the inner mold and the inner wall of the outer mold, wherein the inner mold is a mold with a closed top side, and the outer mold is a mold with an open top side, and the wall thickness of the mold cavity formed between the outer mold and the inner mold is the same at all positions on the same plane;

[0009] S2, injecting slurry from the opening of the mold cavity to fill the entire mold cavity;

[0010] S3. After the slurry is solidified, the outer mold is taken out to obtain a blank of the molded product.

[0011] As described above, the beneficial effect is that: based on the current traditional manual operation method, there are certain problems in terms of efficiency and quality. Due to these reasons, the present invention adopts the pouring technology of combining the inner mold with the outer mold (reference Figure 4The coffee table interior and exterior mold, Figure 5 The inner and outer molds of the flower pots) are used as the inner mold (reference Figure 6 The inner mold of the coffee table, Figure 7 The flow of slurry is guided by the precise positioning of the inner mold of the flower pot, and the inner mold is no longer taken out after the product solidifies. Without this mold removal operation, complex shapes can be easily realized, and the problem of uniform wall thickness of the product on the same plane is solved. The uniformity of all wall thicknesses can also be guaranteed according to the product structure. This not only makes the entire product evenly stressed, but the key is that overheating caused by the aggregation of slurry due to the sliding of slurry will no longer occur in the corners.

[0012] In addition, it is difficult to control the uniform wall thickness during manual feeding, which not only affects the overall force and the generation of heat due to the aggregation of materials, but also affects the amount of feeding, resulting in deviations in the weight of the product. Because the inner and outer molds are positioned at the same time, the filling space is also determined, and the weight can be obtained by estimating the proportion of the slurry based on the volume of the space. Each time, just fill the entire mold cavity with slurry, which is extremely simple to operate. In this way, the weight of each product is basically the same, which basically solves the problem of the product needing to be refilled at the end every time due to weight deviation.

[0013] Moreover, the use of internal mold-assisted pouring technology instead of manual application makes the operation more "foolproof"; it not only improves production efficiency, but also greatly reduces the proficiency requirements for technical workers.

[0014] Preferably, the types of molded products include flower pots and furniture.

[0015] Preferably, when the molded product is a flower pot, after the flower pot blank is solidified, the top of the inner mold is cut off along the inner edge of the top surface of the flower pot blank, and the rest of the inner mold is retained.

[0016] Preferably, when the type of the molded product is furniture, the inner film is fully integrated into the blank.

[0017] Preferably, the slurry is an inorganic gelling material.

[0018] Preferably, the inorganic gelling material comprises cement and magnesium oxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flowchart of a method for forming a blank of a molded product according to the present invention;

[0020] Figure 2 is a schematic diagram of a coffee table in Example 1;

[0021] Figure 3 is a schematic diagram of a flower pot in Example 1;

[0022] Figure 4 It is a structural schematic diagram of the combination of the inner and outer molds of the coffee table in the technical solution of the invention content;

[0023] Figure 5 It is a structural schematic diagram of the combination of the inner and outer molds of the flower pot in the technical solution of the invention content;

[0024] Figure 6 It is a schematic diagram of the structure of the inner mold of the coffee table in the technical solution of the invention content;

[0025] Figure 7 It is a schematic diagram of the structure of the inner mold of the flower pot in the technical solution of the invention content. DETAILED DESCRIPTION

[0026] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0027] Embodiment 1

[0028] Please refer to Figure 1 As shown, a method for forming a blank of a molded product comprises the following steps:

[0029] S1. Position the inner mold inside the outer mold so that there is a mold cavity for filling between the outer wall of the inner mold and the inner wall of the outer mold, wherein the inner mold is a mold with a closed top side, and the outer mold is a mold with an open top side, and the wall thickness of the mold cavity formed between the outer mold and the inner mold is the same at all positions on the same plane;

[0030] S2, injecting slurry from the opening of the mold cavity to fill the entire mold cavity;

[0031] S3. After the slurry is solidified, the outer mold is taken out to obtain a blank of the molded product.

[0032] Wherein, the slurry is an inorganic gelling material.

[0033] Among them, this scheme can use almost all inorganic gelling materials, including cement and magnesium oxide, and other inorganic gelling materials that are solidified into a shape after a certain period of time in a thin or thick slurry.

[0034] In the prior art, due to manual application, especially on the furniture tabletop with sharp edges, the material often slides down and slurry gathers due to excessive or thin application, which may cause cracking of certain inorganic gelling materials due to local overheating during the curing process; if the material is thick, the application will not slide down, but it brings another problem, that is, some pores that customers do not allow often appear on the surface from time to time, which brings a huge workload for subsequent repairs. Although a lot of efforts have been made and some measures have been taken for this matter, up to now, the problem of eliminating pores has been under discussion.

[0035] Based on the technical solution of the present invention, thinners with good leveling properties (such as aluminate cement and related products, fly ash with appropriate amount of admixtures, etc.) are used during pouring. Due to the selection of grouting materials and the pouring technology combining inner and outer molds, the surface pores are greatly reduced. This is particularly demanding for furniture. Generally, conspicuous pores are not allowed on the desktop. Once they appear, it is very troublesome to repair them, because if they are not handled properly, the traces left on the surface after painting cannot be wiped off. This defect is usually never allowed. In terms of reducing pores, pouring operations are much better than manual operations.

[0036] Among them, the types of molded products include flower pots and furniture.

[0037] When the molded product is furniture, the inner film is completely integrated into the blank. Figure 2 As shown in the figure, taking the coffee table as an example, the inner mold is designed to be disposable. After pouring, the inner mold is no longer taken out, and its inner film is completely integrated into the blank. The inner mold not only plays a positioning function but also plays a role in strengthening the product structure. It is integrated with the inorganic gelling material during the curing process, which greatly enhances the overall compressive resistance compared with the previous products with the same wall thickness. The wall thickness of this product with a structural inner mold can be made thinner than before under the same pressure resistance, which invisibly saves the amount of material.

[0038] like Figure 3 As shown, when the type of molded product is a flower pot, its structure is basically the same as that of furniture, and is also shaped according to the appearance contour of the flower pot. The difference is that the inner mold of the furniture is fully integrated into the product, while the flower pot blank needs to be cut off along the inner edge of the top surface of the flower pot blank after solidification, and the rest of the inner mold is retained. Since only the top of the inner mold of the flower pot blank is cut off, and the rest is no longer taken out, it is equivalent to putting a plastic shell inside the flower pot, which plays a waterproof role invisibly. This not only saves the labor and material costs of waterproof paint, but also the waterproof effect is much better than the previous painting. Once the waterproof problem is solved, other surface effects that cannot be achieved due to water seepage problems can be reconsidered (such as high gloss).

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for forming a blank of a molded product, characterized in that: The steps include: S1. Position the inner mold inside the outer mold so that there is a mold cavity for filling between the outer wall of the inner mold and the inner wall of the outer mold, wherein the inner mold is a mold with a closed top side, and the outer mold is a mold with an open top side, and the wall thickness of the mold cavity formed between the outer mold and the inner mold is the same at all positions on the same plane; S2, injecting slurry from the opening of the mold cavity to fill the entire mold cavity; S3. After the slurry is solidified, the outer mold is taken out to obtain a blank of the molded product.

2. The method for forming a blank of a molded product according to claim 1, characterized in that: The types of molded products include flower pots and furniture.

3. The method for forming a blank of a molded product according to claim 2, characterized in that: When the molded product is a flower pot, after the flower pot blank is solidified, the top of the inner mold is cut off along the inner edge of the top surface of the flower pot blank, and the rest of the inner mold is retained.

4. The method for forming a blank of a molded product according to claim 2, characterized in that: When the type of the molded product is furniture, the inner film is fully integrated into the blank.

5. The method for forming a blank of a molded product according to claim 1, characterized in that: The slurry is an inorganic gelling material.

6. The method for forming a blank of a molded product according to claim 5, characterized in that: The inorganic gelling material includes cement and magnesium oxide.

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