A model for evaluating the quality of a molded plastic molded product

Abstract

The utility model discloses a model for evaluating the quality of moulding of moulding compound, including roof and the first side plate and the second side plate of surrounding in the roof edge place and downward extension, the roof, first side plate and second side plate are integral moulding piece, the first side plate and second side plate enclose a circle to make the model form the cavity of opening downward, the included angle of second side plate and roof is obtuse angle, the included angle of first side plate and roof is right angle or obtuse angle, the bottom surface of roof is equipped with staggered arrangement's rib plate, and the intersection of rib plate is equipped with reinforcing column and reinforcing cylinder. The model for evaluating the quality of moulding of moulding compound of the utility model has integrated multiple structural units, can timely and effective evaluation to the appearance and performance of product, shortens the time of customer trial mould verification.

Description

Technical Field

[0001] This utility model relates to a model of a molded product used to evaluate the molding quality of molding compound, and belongs to the field of molding technology. Background Technology

[0002] SMC is an abbreviation for Sheet Molding Compound, and BMC is an abbreviation for Bulk Molding Compound. SMC / BMC molded products are made of glass fiber reinforced unsaturated polyester resin, featuring a three-dimensional network structure, multifunctional fillers, and special fiber reinforcement, resulting in excellent electrical insulation properties and superior resistance to dielectrics. SMC / BMC product manufacturing primarily utilizes compression molding, and its applications span a wide range of fields including aerospace, construction and home decoration, automotive parts, and electronics. While the product types are diverse, different products typically contain various structural units such as planes, sides, ribs, holes, and inserts. The presence of these structural units affects the first-pass yield of the molded product's appearance and performance. This is because SMC / BMC molded products shrink during and after molding, making them prone to cracking at stress concentration points, forming shallow cracks.

[0003] Chinese patent document CN106442043A discloses a performance testing mold for SMC sheets used in manufacturing automotive parts, including a base, an upper mold base, a punch, a lower mold base, a die, and a connecting plate. The upper and lower mold bases have fixing grooves on their four sides. The die is embedded in the upper surface of the lower mold base, and the punch is embedded in the lower surface of the upper mold base. The die has multiple cavities, and the punch has multiple sample protrusions. Both the upper and lower mold bases have two testing holes and four heating holes. Thermocouples are inserted into the testing holes, and heating rods are inserted into the heating holes. This patent's detectable structural units are too limited, only addressing the mechanical performance testing of SMC before mass production, and does not cover the complex appearance and performance testing of the product structure. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a model integrating multiple structural units, with strong resistance to deformation, for evaluating the molding quality of molding compounds, addressing the needs of customers with complex product structures requiring a smooth appearance free of shrinkage marks and shallow cracks, while also meeting functional requirements. This provides customers with products that are complex in shape yet have a flat surface, shortening the time required for trial molding and verification.

[0005] The present invention provides a technical solution to solve the above-mentioned technical problems as follows: a model for evaluating the molding quality of molding compound, comprising a top plate and a first side plate and a second side plate surrounding the edge of the top plate and extending downward, wherein the top plate, the first side plate and the second side plate are integrally molded parts, and the first side plate and the second side plate form a circle, thereby making the model form a cavity with an opening facing downward; the angle between the second side plate and the top plate is an obtuse angle, and the angle between the first side plate and the top plate is a right angle or an obtuse angle; the bottom surface of the top plate is provided with staggered ribs, and the intersection of the ribs is provided with reinforcing columns and reinforcing cylinders.

[0006] Preferably, the top plate is a rectangular flat plate, there are three first side plates and one second side plate, the four corners of the top plate are rounded, and the connection between adjacent side plates is a rounded transition; the inner wall of the first side plate is provided with a pressure-bearing column arranged along the height direction of the first side plate; the inner walls of the two oppositely arranged first side plates are each provided with at least two pressure-bearing columns, and the pressure-bearing columns are located at both ends of the inner wall of the first side plate.

[0007] Preferably, there are two longitudinal ribs and three transverse ribs, and the thickness of the ribs is different. A groove is formed between two adjacent ribs. A detachable movable insert is provided in the groove. The movable insert is rectangular and there are two movable inserts. The two movable inserts are attached to each other and perpendicular to each other in an L-shape.

[0008] Preferably, the angle between the top plate and the first side plate is 90° to 91°.

[0009] Preferably, the angle between the top plate and the second side plate is 100° to 120°.

[0010] Preferably, the thicknesses of the two longitudinally arranged ribs are 2.5 mm and 3.5 mm, and the thicknesses of the three transversely arranged ribs are 2.5 mm, 3.5 mm and 4.5 mm, respectively.

[0011] Preferably, the ribs are arranged perpendicular to the top plate.

[0012] Preferably, there are at least four reinforcing cylinders, which are hollow cylinders with a wall thickness of 1 mm to 2 mm. The diameter of each reinforcing cylinder is different, ranging from 7 mm to 18 mm. The reinforcing column is a solid cylinder with a diameter of 10 mm to 15 mm.

[0013] Preferably, the top plate, the first side plate, and the second side plate are flat plates of the same thickness; the thickness of the top plate, the first side plate, and the second side plate is 3 to 5 mm.

[0014] The beneficial effects of this utility model are:

[0015] (1) The model of this utility model integrates planar, vertical and rib structural units with different angles and different thicknesses by setting side plates with different tilt angles, multiple ribs with different thicknesses, reinforcing columns and reinforcing cylinders with different diameters. It can simultaneously simulate and press multiple structural units and evaluate their appearance and performance in a timely and effective manner, thereby improving the relevant formula and greatly improving the development progress and success rate of SMC / BMC material formula.

[0016] (2) The top plate and side plate of the model of this utility model are relatively thin. By setting pressure columns on both sides of the inner wall of the first side plate, the risk of cracking during demolding is improved. Rounded corners are set at the four corners of the top plate to facilitate the flow of SMC material in the mold cavity. Setting multiple ribs of different thicknesses can expand the detection range. Furthermore, by using detachable movable inserts to cooperate with the upper and lower molds, it can effectively avoid sticking or cracking on the thinner ribs, and it is also convenient to clean the mold. Attached Figure Description

[0017] The model of this utility model for evaluating the molding quality of molding compounds will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model when viewed from the bottom.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model without the movable insert;

[0020] Figure 3 This is a schematic diagram of the structure of this utility model when viewed from the bottom.

[0021] The above figures are labeled as follows:

[0022] Top plate 1, first side plate 2, second side plate 3, rib plate 4, reinforcing column 5, reinforcing cylinder 6, bearing column 7, movable insert 8. Detailed Implementation

[0023] See Figures 1 to 3 The model used in this embodiment for evaluating the molding quality of molding compounds includes a top plate 1 and a first side plate 2 and a second side plate 3 that surround the edge of the top plate 1 and extend downwards. The top plate 1, the first side plate 2, and the second side plate 3 are integrally molded parts. The first side plate 2 and the second side plate 3 form a circle, thereby creating a downward-opening cavity in the model. The angle between the second side plate 3 and the top plate 1 is an obtuse angle, and the angle between the first side plate 2 and the top plate 1 is a right angle or an obtuse angle. The bottom surface of the top plate 1 is provided with staggered ribs 4, and reinforcing pillars 5 and reinforcing cylinders 6 are provided at the intersections of the ribs 4.

[0024] The top plate 1 is a rectangular flat plate, the first side plate 2 has three pieces, and the second side plate 3 has one piece. The four corners of the top plate 1 are rounded, and the connection between adjacent side plates is a rounded transition. The inner wall of the first side plate 2 is provided with pressure-bearing columns 7 arranged along the height direction of the first side plate 2. The inner walls of the two oppositely arranged first side plates 2 are each provided with at least two pressure-bearing columns 7, which are located at both ends of the inner wall of the first side plate 2.

[0025] There are two longitudinal ribs 4 and three transverse ribs 4, and the thickness of each rib 4 is different. A groove is formed between two adjacent ribs 4. A detachable movable insert 8 is provided in the groove. The movable insert 8 is a rectangular body. There are two movable inserts 8. The two movable inserts 8 are attached to each other and perpendicular to each other in an L-shape.

[0026] The four corners of the top plate are rounded with a radius of 8mm. The angle between the top plate 1 and the first side plate 2 is 90.5°. The angle between the top plate 1 and the second side plate 3 is 110°.

[0027] The two longitudinally arranged ribs 4 have thicknesses of 2.5mm and 3.5mm, respectively, and the three transversely arranged ribs 4 have thicknesses of 2.5mm, 3.5mm and 4.5mm, respectively.

[0028] Rib 4 is set perpendicular to top plate 1.

[0029] There are four reinforcing cylinders 6, with diameters of 9mm, 12mm, 13mm and 15mm respectively, and the diameter of the reinforcing column 5 is 12mm.

[0030] The top plate 1, the first side plate 2, and the second side plate 3 are flat plates with a thickness of 3.5mm.

[0031] The model used in this embodiment for evaluating the molding quality of molding compounds is produced by pressing an upper and lower mold together under pressure and heat. The pressure and temperature can be adjusted according to the process. A cavity is formed between the upper and lower molds to accommodate the model. The cavity of the lower mold is provided with a positioning groove for setting the movable insert 8. Before pressing, the movable insert 8 is placed in the positioning groove of the lower mold, and then the SMC molding compound is placed on the lower mold. Then, the upper mold is lowered to close the mold, and heat and pressure are applied. After a certain period of time, a model for evaluating the molding quality of the molding compound is formed. Then, the model is ejected with an ejector rod. By observing the various structural units on the model, its appearance and performance are evaluated, thereby assessing the quality of the formula and process and allowing for timely adjustments.

[0032] Obviously, the above embodiments are merely examples for clearly illustrating the embodiments of this utility model, and are not intended to limit the embodiments of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the spirit of this utility model are still within the protection scope of this utility model.

Claims

1. A model for evaluating the mold pressing quality of a molding compound, characterized by, The top plate (1) includes a top plate (1) and a first side plate (2) and a second side plate (3) that surround the edge of the top plate (1) and extend downward. The top plate (1), the first side plate (2) and the second side plate (3) are integrally molded parts. The first side plate (2) and the second side plate (3) form a circle, so that the model forms a cavity with an opening facing downward. The angle between the second side plate (3) and the top plate (1) is an obtuse angle, and the angle between the first side plate (2) and the top plate (1) is a right angle or an obtuse angle. The bottom surface of the top plate (1) is provided with staggered ribs (4), and the intersection of the ribs (4) is provided with reinforcing columns (5) and reinforcing cylinders (6).

2. The model for evaluating the molding quality of molding compounds according to claim 1, characterized in that, The top plate (1) is a rectangular flat plate. There are three first side plates (2) and one second side plate (3). The four corners of the top plate (1) are rounded, and the connection between adjacent side plates is a rounded transition. The inner wall of the first side plate (2) is provided with a pressure-bearing column (7) arranged along the height direction of the first side plate (2). The inner walls of the two opposite first side plates (2) are each provided with at least two pressure-bearing columns (7), and the pressure-bearing columns (7) are located at both ends of the inner wall of the first side plate (2).

3. The model for evaluating the molding quality of molding compounds according to claim 1, characterized in that, There are two longitudinal ribs (4) and three transverse ribs (4), and the thickness of each rib (4) is different. A groove is formed between two adjacent ribs (4), and a detachable movable insert (8) is provided in the groove. The movable insert (8) is a rectangular body, and there are two movable inserts (8). The two movable inserts (8) are attached to each other and perpendicular to each other in an L-shape.

4. The model for evaluating the molding quality of molding compounds according to claim 1, characterized in that, The angle between the top plate (1) and the first side plate (2) is 90° to 91°.

5. A model for evaluating the molding quality of molding compounds according to claim 1, characterized in that, The angle between the top plate (1) and the second side plate (3) is 100° to 120°.

6. A model for evaluating the molding quality of molding compounds according to claim 3, characterized in that, The thicknesses of the two longitudinally arranged ribs (4) are 2.5 mm and 3.5 mm, respectively, and the thicknesses of the three transversely arranged ribs (4) are 2.5 mm, 3.5 mm and 4.5 mm, respectively.

7. A model for evaluating the molding quality of molding compounds according to claim 1, characterized in that, The rib (4) is set perpendicular to the top plate (1).

8. A model for evaluating the molding quality of molding compounds according to claim 1, characterized in that, There are at least four reinforcing cylinders (6), each of which is a hollow cylinder with a wall thickness of 1 mm to 2 mm. The diameters of each reinforcing cylinder (6) are different, ranging from 7 mm to 18 mm. The reinforcing column (5) is a solid cylinder with a diameter of 10 mm to 15 mm.

9. A model for evaluating the molding quality of molding compounds according to any one of claims 1 to 8, characterized in that, The top plate (1), the first side plate (2), and the second side plate (3) are flat plates of the same thickness; the thickness of the top plate (1), the first side plate (2), and the second side plate (3) is 3 to 5 mm.

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