Burr-free forming structure for injection mold

Abstract

The burr-free forming structure comprises a first forming block, a second forming block and a third forming block, and the side, close to the second forming block, of the first forming block is in interference fit with the side, close to the first forming block, of the second forming block. The side, close to the second forming block, of the third forming block is in interference fit with the side, close to the third forming block, of the second forming block, the upper ends of the first forming block, the second forming block and the third forming block jointly form a male mold cavity matched with an injection product, and an exhaust channel communicated with the male mold cavity is formed in the second forming block; through the mode, burrs of injection molding products caused by gaps between the molding blocks can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of mobile communications, in particular to a burr-free molding structure for an injection mold. Background Art

[0002] Most automotive parts require sealing, so some plastic components often require sealing rings. Because sealing rings are made of soft material, the burr requirements at the contact area between the plastic part and the ring are extremely high. Even though conventional automotive engineering plastics (such as PBT / PA66 / PPA) generally meet the burr requirement of 0.2mm, PPS material has excellent fluidity, and in mass production, the burr often exceeds 0.3mm. Furthermore, due to its brittleness, PPS burrs are very easy to break off, which is undoubtedly a fatal problem for products that require cleanliness.

[0003] Therefore, when it is impossible to effectively control the problem at the production stage, additional labor is required. After the plastic parts are produced, the burrs are manually removed and then cleaned with high-pressure gas. Even though the labor cost and cleaning equipment cost are increased, the cleaning effect is usually not ideal. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide a burr-free molding structure for an injection mold, which can avoid burrs on injection products caused by gaps between molding blocks.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a burr-free molding structure for an injection mold, including: a first molding block, a second molding block and a third molding block, the side of the first molding block close to the second molding block is interference fit with the side of the second molding block close to the first molding block, the side of the third molding block close to the second molding block is interference fit with the side of the second molding block close to the third molding block, the upper ends of the first molding block, the second molding block and the third molding block jointly form a male mold cavity that matches the injection molded product, and the second molding block is provided with an exhaust channel connected to the male mold cavity.

[0006] Preferably, the second molding block is provided with a first secondary protrusion, a first groove, a first main protrusion, a second groove, and a second secondary protrusion in sequence from the outside to the inside. The first secondary protrusion, the first groove, the first main protrusion, the second groove, and the second secondary protrusion together enable the injection molded product to form a sealing groove and an outer wall of the sealing groove that cooperates with the sealing ring.

[0007] Preferably, the exhaust channel includes an exhaust hole, an exhaust chamfer, and an exhaust groove. The exhaust hole is opened on the second molding block and is connected to the male mold cavity. The exhaust chamfer is opened on the chamfer at the contact point between the second molding block and the first molding block and / or the third molding block. The exhaust groove is opened on the second molding block and is connected to the outside world. The exhaust hole is connected to the exhaust chamfer, and the exhaust chamfer is connected to the exhaust groove.

[0008] Preferably, the depth of the vent hole is less than the overflow value of the injection molded product material.

[0009] Preferably, the exhaust hole is provided on the first secondary protrusion and / or the second secondary protrusion, and the exhaust chamfer is provided on the chamfer of the first secondary protrusion and / or the second secondary protrusion.

[0010] Preferably, the distance between the inner and outer sides of the second forming block gradually narrows, and the distance between the two sides of the second forming block away from the male mold cavity is larger than the distance between the two sides of the second forming block close to the male mold cavity.

[0011] Preferably, a margin layer is provided at the contact surfaces where the first forming block, the second forming block and the third forming block are interference-fitted with each other.

[0012] The beneficial effects of the present invention are as follows: an injection molded product is molded by combining a plurality of molding blocks, and gaps between the molding blocks are eliminated by interference fitting the first molding block, the second molding block, and the third molding block, thereby avoiding burrs generated due to gaps between the molding blocks during injection molding, and an exhaust channel is provided on the second molding block in conjunction with the first molding block and the second molding block to discharge gas decomposed during injection molding, thereby quickly and completely discharging gas during injection molding, avoiding the influence of gas on the molding of the injection molded product and avoiding defects of the injection molded product caused by gas. In summary, the injection molded product is free of burrs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of an injection molded product;

[0014] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 3 It is a schematic diagram of the positional relationship between the utility model as a whole and the product;

[0016] Figure 4 It is a cross-sectional view of the utility model;

[0017] Figure 5 yes Figure 4 A magnified schematic diagram of the middle part A;

[0018] Figure 6 It is a cross-sectional view of another position of the utility model;

[0019] Figure 7 yes Figure 6 Enlarged schematic diagram of middle part B;

[0020] Figure 8 It is an exploded schematic diagram of the utility model;

[0021] Figure 9 yes Figure 8 Enlarged schematic diagram of part C in the middle.

[0022] The markings of the components in the accompanying drawings are as follows:

[0023] 1. The first forming block;

[0024] 2. Second forming block; 21. First secondary protrusion; 22. First groove; 23. First main protrusion; 24. Second groove; 25. Second secondary protrusion;

[0025] 3. The third forming block;

[0026] 41. Exhaust hole; 42. Exhaust chamfer; 43. Exhaust groove;

[0027] 5. Product. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities of the International System of Units (SI) basic units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0035] Example:

[0036] refer to Figures 1-9, a burr-free molding structure for an injection mold, comprising: a first molding block 1, a second molding block 2 and a third molding block 3, wherein the side of the first molding block 1 close to the second molding block 2 is interference fit with the side of the second molding block 2 close to the first molding block 1, and the side of the third molding block 3 close to the second molding block 2 is interference fit with the side of the second molding block 2 close to the third molding block 3, and a margin layer is provided at the contact surfaces of the first molding block 1, the second molding block 2 and the third molding block 3 where they are interference fit with each other. Preferably, a certain margin can be left at the outer side of the second molding block 2 where the first molding block 1 and the third molding block 3 are in contact during processing, so that when an external force acts on the second molding block 2, the second molding block 2 is fully interference fit with the side surface between the first molding block 1 and the second molding block 2 through the reserved margin, thereby avoiding gaps between the molding blocks and causing burrs on the injection molded product 5 during injection molding. Of course, a margin can also be provided on the side of the first molding block 1 and the third molding block 3 close to the second molding block 2 to achieve an interference fit between the first molding block 1, the second molding block 2, and the third molding block 3, thereby eliminating the effect of the gap between the molding blocks on the burrs of the injection molded product 5. The upper ends of the first molding block 1, the second molding block 2, and the third molding block 3 jointly form a male mold cavity that cooperates with the injection molded product 5, and through cooperation with the female mold cavity (not shown in the figure), the injection molded product 5 is injection molded.

[0037] refer to Figure 4 、 Figure 6 and Figure 8 In order to facilitate the interference fit and tighter fit between the first molding block 1, the second molding block 2 and the third molding block 3, the distance between the inner and outer sides of the second molding block 2 gradually narrows, and the distance between the two sides of the end of the second molding block 2 away from the male mold cavity is greater than the distance between the two sides of the end of the second molding block 2 close to the male mold cavity, that is, the distance between the inner and outer sides of the end of the second molding block 2 away from the injection molded product 5 is greater than the distance between the inner and outer sides of the end of the second molding block 2 close to the injection molded product 5. In this way, when assembling the first molding block 1, the second molding block 2 and the third molding block 3, it is only necessary to apply force to the second molding block 2 to fully achieve the interference fit between the first molding block 1, the second molding block 2 and the third molding block 3.

[0038] refer to Figure 9 The second molding block 2 is provided with a first secondary protrusion 21, a first groove 22, a first main protrusion 23, a second groove 24, and a second secondary protrusion 25 in sequence from the outside to the inside. The first secondary protrusion 21, the first groove 22, the first main protrusion 23, the second groove 24, and the second secondary protrusion 25 together enable the injection molded product 5 to form a sealing groove and an outer wall of the sealing groove that cooperates with the sealing ring.

[0039] refer to Figure 4 、 Figure 6 、 Figure 8 and Figure 9 In order to avoid the influence of gas on the molding of the injection molded product 5 during injection molding, an exhaust channel connected to the male mold cavity is opened on the second molding block 2, and the exhaust channel includes an exhaust hole 41, an exhaust chamfer 42, and an exhaust groove 43. The exhaust hole 41 is opened on the first secondary protrusion 21 and / or the second secondary protrusion 25 of the second molding block 2 and is connected to the male mold cavity. The exhaust chamfer 42 is opened on the chamfer of the first secondary protrusion 21 and / or the second secondary protrusion 25 at the contact point between the second molding block 2 and the first molding block 1 and / or the third molding block 3, thereby forming an exhaust chamfer 42 between the first molding block 1 and / or the third molding block 3. The exhaust groove 43 is opened on the second molding block 2 and is connected to the outside world. The exhaust hole 41 is connected to the exhaust chamfer 42, and the exhaust chamfer 42 is connected to the exhaust groove 43. Therefore, when the gas decomposed by the injection molded product 5 during injection molding, the gas enters the exhaust hole 41 and enters the exhaust chamfer 42 through the exhaust hole 41, and finally converges into the exhaust groove 43 for exhaust, thereby avoiding the gas from affecting the injection molded product 5. The depth of the vent hole 41 is smaller than the overflow value of the material of the injection-molded product 5 , thereby avoiding burrs on the product 5 caused by the opening of the vent hole 41 .

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A burr-free molding structure for an injection mold, characterized in that: include: A first molding block (1), a second molding block (2) and a third molding block (3), wherein a side of the first molding block (1) close to the second molding block (2) is interference-fitted with a side of the second molding block (2) close to the first molding block (1), and a side of the third molding block (3) close to the second molding block (2) is interference-fitted with a side of the second molding block (2) close to the third molding block (3), and the upper ends of the first molding block (1), the second molding block (2) and the third molding block (3) jointly form a male mold cavity that matches the injection molded product (5), and the second molding block (2) is provided with an exhaust channel that communicates with the male mold cavity.

2. The burr-free molding structure for an injection mold according to claim 1, characterized in that: The second molding block (2) is provided with a first secondary protrusion (21), a first groove (22), a first main protrusion (23), a second groove (24), and a second secondary protrusion (25) in sequence from the outside to the inside. The first secondary protrusion (21), the first groove (22), the first main protrusion (23), the second groove (24), and the second secondary protrusion (25) together enable the injection molded product (5) to form a sealing groove that matches the sealing ring and the outer wall of the sealing groove.

3. The burr-free molding structure for an injection mold according to claim 2, characterized in that: The exhaust channel comprises an exhaust hole (41), an exhaust chamfer (42), and an exhaust groove (43); the exhaust hole (41) is provided on the second molding block (2) and communicates with the male mold cavity; the exhaust chamfer (42) is provided on the chamfer at the contact point between the second molding block (2) and the first molding block (1) and / or the third molding block (3); the exhaust groove (43) is provided on the second molding block (2) and communicates with the outside; the exhaust hole (41) is communicated with the exhaust chamfer (42), and the exhaust chamfer (42) is communicated with the exhaust groove (43).

4. The burr-free molding structure for an injection mold according to claim 3, characterized in that: The depth of the vent hole (41) is less than the overflow value of the injection molded product (5) material.

5. The burr-free molding structure for an injection mold according to claim 3, characterized in that: The exhaust hole (41) is provided on the first secondary protrusion (21) and / or the second secondary protrusion (25), and the exhaust chamfer (42) is provided on the chamfer of the first secondary protrusion (21) and / or the second secondary protrusion (25).

6. The burr-free molding structure for an injection mold according to claim 1, characterized in that: The distance between the inner and outer sides of the second forming block (2) gradually narrows, and the distance between the two sides of the end of the second forming block (2) away from the male mold cavity is greater than the distance between the two sides of the end of the second forming block (2) close to the male mold cavity.

7. The burr-free molding structure for an injection mold according to claim 1, characterized in that: A margin layer is provided at the contact surfaces of the first forming block (1), the second forming block (2) and the third forming block (3) where they are interference-fitted with each other.

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