Plastic mold for reducing surface defects of fiber-reinforced polyphthalamide products

Abstract

The invention relates to a plastic mold for reducing surface defects of fiber-reinforced polyphthalamide products, and belongs to the field of plastic mold technology. The product is mainly used in high-precision functional injection molding parts for automobiles. By setting a specific exhaust mechanism on the mold parting surface, the problem of burrs, surface burns and other surface defects of fiber-reinforced polyphthalamide resin during molding is solved, the defect rate is reduced, and production efficiency is improved.

Description

Technical Field

[0001] The patent of this invention belongs to the field of plastic mold technology, and relates to a plastic mold for reducing surface defects of fiber-reinforced polyphthalamide products. The product is mainly used in high-precision functional injection molding parts for automobiles. Background Art

[0002] At present, polyetheretherketone resin is mostly used for injection molding of high-precision functional injection molded parts around automobile engines in the market. Since this resin is relatively expensive, the product cost performance is not high, and the use of traditional nylon materials cannot meet the use conditions well. In order to solve this problem, resin manufacturers have developed fiber-reinforced polyphthalamide resin. Compared with typical nylon resin, this resin has excellent high thermal performance, high hardness, and is insensitive to moisture. In humid and chemically corrosive environments, the mechanical properties, creep resistance and fatigue resistance are very excellent. However, due to its narrow molding window, the resin is very easy to produce surface defects such as product burns, gas marks, burrs, etc. during the injection molding process, affecting the product function. The use of traditional mold exhaust structure can no longer guarantee the surface quality of the product. How to ensure the surface quality of fiber-reinforced polyphthalamide products and reduce costs is a problem that needs to be solved. Summary of the invention

[0003] The purpose of the present invention is to provide a plastic mold for reducing surface defects of fiber-reinforced polyphthalamide products. The mold adopts shape-conforming exhaust and constrains the exhaust angle, thereby meeting the surface technical requirements of the product design and ensuring the accuracy of the product. At the same time, the new structure is added with a check groove to prevent resin particles from contaminating the mold exhaust duct, reducing the frequency of mold maintenance and improving production efficiency.

[0004] The technical problem to be solved by the present invention is to provide a plastic mold for reducing surface defects of fiber-reinforced polyphthalamide products, overcome the shortcomings of traditional molds with single depth and width exhaust, and meet the requirements of smooth injection molding of fiber-reinforced polyphthalamide products with qualified surface quality by adopting a combination of a conformal exhaust duct and a precise exhaust angle.

[0005] The technical solution adopted by the present invention: the structure of the plastic mold for reducing the surface defects of fiber-reinforced polyphthalamide products includes: a fixed mold bottom plate 1, a hot runner plate 2, a stripper plate 3, a fixed mold plate 4, a fixed mold insert 5, a movable mold insert 6, a movable mold plate 7, a first draw plate 8, a square iron 9, a surface needle plate 10, Bottom needle plate 11, movable mold bottom plate 12, movable mold core 13; the connection relationship of the plastic mold for reducing surface defects of fiber-reinforced polyphthalamide products is as follows: the fixed mold insert 5 is in contact with the fixed mold plate 4 and is fixed by bolts, the movable mold insert 6 is provided with an exhaust surface A6-1, a supporting inclined surface A6-2, an exhaust groove A6-3, and a check groove 6-4, the fixed mold insert 5 and the movable mold insert 6 surface are matched and sealed with glue, the movable mold core 13 is provided with an exhaust surface B13-1, a supporting inclined surface B13-2, and an exhaust groove B13-3, and the exhaust surface B13-1 on the movable mold core 13 is matched with the clearance of the inner hole side wall of the movable mold insert 6.

[0006] The width of the exhaust surface A6-1 of the movable mold insert 6 is required to be 1±0.1 mm, the depth is required to be 0.005 mm, the upper tolerance is 0.002 mm, and the lower tolerance is 0 mm. The width of the supporting slope A6-2 is required to be 4±0.5 mm, and the angle is required to be 25±1 degrees. The width of the exhaust groove A6-3 is required to be 8±0.5 mm, the depth is required to be 2±0.1 mm, and the depth of the check groove 6-4 is required to be 3±0.5 mm.

[0007] The width of the exhaust surface B13-1 of the dynamic model core 13 is required to be 1±0.1 mm, the depth is required to be 0.005 mm, the upper tolerance is 0.002 mm, and the lower tolerance is 0 mm. The width of the supporting slope A6-2 is required to be 3±0.5 mm, the angle is required to be 10±1 degrees, and the width of the exhaust groove B13-3 is required to be 5±0.5 mm, and the depth is required to be 0.5±0.1 mm.

[0008] Working principle of plastic mold for reducing surface defects of fiber-reinforced polyphthalamide products: After the mold is closed, injection molding begins, and fiber-reinforced polyphenylene sulfide resin enters the cavity. Excess gas in the cavity is discharged through the exhaust surface A6-1 set on the movable mold insert 6, and the gas passes through the supporting slope A6-2, the exhaust groove A6-3, and the non-return groove 6-4, and is finally discharged out of the mold. Resin particles mixed in the gas fall into the non-return groove 6-4 and are discharged through the exhaust surface B13-1 set in the movable model core 13. The gas passes through the supporting slope B13-2 and the exhaust groove B13-3, and is finally discharged out of the mold. The mold is opened after pressure maintenance and cooling, and a molding cycle ends.

[0009] The beneficial effect of the present invention is that by arranging a specific exhaust mechanism on the mold parting surface, the problem of surface defects such as burrs and surface burnt easily generated during molding of fiber-reinforced polyphthalamide resin is solved, the defect rate is reduced, and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following is a detailed description of the embodiments with reference to the accompanying drawings.

[0011] Figure 1 It is the overall assembly drawing of the mold.

[0012] Figure 2 It is the assembly drawing of the mold movable mold insert and the movable mold core.

[0013] Figure 3 It is a cross-sectional numbered diagram of the exhaust of the movable mold insert of the mold.

[0014] Figure 4 This is the dimensional tolerance drawing of the mold movable mold insert exhaust.

[0015] Figure 5 It is a cross-sectional numbered diagram of the exhaust of the mold dynamic model core.

[0016] Figure 6 It is the dimension tolerance drawing of the mold dynamic model core exhaust.

[0017] Figure 7 It is an isometric view of the exhaust of the movable mold insert of the mold.

[0018] In the figure, 1 is a fixed mold bottom plate, 2 is a hot runner plate, 3 is a stripper plate, 4 is a fixed mold plate, 5 is a fixed mold insert, 6 is a movable mold insert, 7 is a movable mold plate, 8 is a first draw plate, 9 is a square iron, 10 is a surface needle plate, 11 is a bottom needle plate, 12 is a movable mold bottom plate, and 13 is a movable mold core. DETAILED DESCRIPTION

[0019] The specific embodiments of the invention are described in detail below with reference to technical texts and drawings.

[0020] Assembly of the fixed mold part: Install the hot runner into the hot runner plate 2, fix the stripper plate to the hot runner plate 2, fix the fixed mold base plate 1 to the hot runner plate 2 with bolts, install the fixed mold insert 5 in the fixed mold plate 4, and fix them with bolts.

[0021] Assembly of the movable mold part: install the movable mold insert 6 in the movable mold plate 7 and fix it by bolts, install the movable mold core 13 in the first draw plate 8 and fix it by bolts, and introduce the movable mold core 13 into the movable mold insert 6 for clearance fit (see Figure 2 ). First, the draw plate 8, the square iron 9, and the movable mold bottom plate 12 are fixed by bolts.

[0022] The specific molding process is: after the mold is closed, injection molding begins, fiber-reinforced polyphenylene sulfide resin enters the cavity, the gas in the cavity is rapidly compressed, and the gas is discharged through the exhaust surface A6-1 set on the movable mold insert 6 (see Figure 7 ), the gas then passes through the support slope A6-2, the exhaust groove A6-3, and the check groove 6-4 (see Figure 3 , 4 ), and finally discharged out of the mold, the resin particles mixed in the gas fall into the check groove 6-4, and part of the gas in the cavity is discharged through the exhaust surface B13-1 set in the dynamic model core 13, and the gas passes through the support slope B13-2 and the exhaust groove B13-3 (see Figure 5 , 6 ), and finally discharged from the mold, the mold is opened after pressure maintenance and cooling, and the molding cycle is completed (see Figure 1 ).

[0023] The above is a superior implementation mode of the present invention. It should be pointed out that for technicians in the technical field to which the present invention belongs, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A plastic mold for reducing surface defects of fiber-reinforced polyphthalamide products, characterized in that The structure comprises: a fixed mold bottom plate (1), a hot runner plate (2), a stripper plate (3), a fixed mold plate (4), a fixed mold insert (5), a movable mold insert (6), a movable mold plate (7), a first draw plate (8), a square iron (9), a face needle plate (10), A bottom needle plate (11), a movable mold bottom plate (12), and a movable mold core (13); the connection relationship is that the fixed mold insert (5) is in surface contact with the fixed mold plate (4) and is fixed by bolt locking; the movable mold insert (6) is provided with an exhaust surface A (6-1), a supporting inclined surface A (6-2), an exhaust groove A (6-3), and a check groove (6-4); the fixed mold insert (5) and the movable mold insert (6) are matched and sealed with glue; the movable mold core (13) is provided with an exhaust surface B (13-1), a supporting inclined surface B (13-2), and an exhaust groove B (13-3); the exhaust surface B (13-1) on the movable mold core (13) is matched with the inner hole side wall of the movable mold insert (6); the exhaust surface A (6-1) of the movable mold insert (6) is required to have a width of 1±0.1 mm and a depth of 0. .005 mm, the upper tolerance is 0.002 mm, the lower tolerance is 0 mm, the width of the support inclined surface A (6-2) is required to be 4±0.5 mm, the angle is required to be 25±1 degrees, the width of the exhaust groove A (6-3) is required to be 8±0.5 mm, the depth is required to be 2±0.1 mm, the depth of the check groove (6-4) is required to be 3±0.5 mm, the width of the exhaust surface B (13-1) of the dynamic model core (13) is required to be 1±0.1 mm, the depth is required to be 0.005 mm, the upper tolerance is 0.002 mm, the lower tolerance is 0 mm, the width of the support inclined surface A (6-2) is required to be 3±0.5 mm, the angle is required to be 10±1 degrees, the width of the exhaust groove B (13-3) is required to be 5±0.5 mm, and the depth is required to be 0.5±0.1 mm.

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