In-mold cutting structure of automobile bumper radar hole injection mold

Abstract

According to the technical scheme, the in-mold cutting structure of the automobile bumper radar hole injection mold comprises a mold cavity plate located on the upper side of a product, a mold core plate located on the lower side of the product and a mold core insert, and a blanking mechanism is arranged at the position, corresponding to the upper portion of a radar hole of the product, of the mold cavity plate. A round groove is formed in the position, corresponding to the lower portion of a product radar hole, of the mold core insert, the blanking mechanism comprises a main connecting block, an auxiliary connecting block, a positioning core rod, an air cylinder and a sleeve-shaped punching cutter, the main connecting block is connected to the mold cavity plate through a screw, and the positioning core rod is fixedly connected to the bottom face of the middle of the main connecting block; the air cylinder is arranged in the main connecting block, an air cylinder rod penetrates out of the bottom face of the main connecting block and then is connected to the auxiliary connecting block, the bottom face of the auxiliary connecting block is connected with the sleeve-shaped punching cutter, the positioning core rod is located in an inner hole of the sleeve-shaped punching cutter, and the inner diameter and the outer diameter of the positioning core rod are matched with each other. According to the utility model, the bumper shell without weld marks can be formed in one set of mold through injection molding, and radar holes can be punched in the mold.

Description

Technical Field

[0001] The utility model relates to an injection mold, in particular to an in-mold cutting structure of an injection mold for a radar hole of an automobile bumper. Background Art

[0002] The car bumper has the functions of safety protection, vehicle decoration and improving the aerodynamic characteristics of the vehicle. From the perspective of safety, it can play a buffering role in the event of a low-speed collision and protect the front and rear bodies of the car; it can also play a certain role in protecting pedestrians in the event of an accident with pedestrians. From the perspective of appearance, it is decorative and has become an important part of decorating the appearance of cars; at the same time, the car bumper also has a certain aerodynamic effect.

[0003] The outermost bumper shell is made of plastic and is manufactured by injection molding. A radar hole for installing a ranging radar is provided on the bumper. Its structure is as follows: Figure 1 As shown in the figure, the setting of the two radar holes on the left and right causes weld lines to be generated during the injection molding process due to the presence of the holes. After the injection molding is completed, obvious weld marks will be produced, affecting the appearance of the product. This injection molding defect cannot be overcome at present.

[0004] Therefore, the practice adopted by the industry is to not leave radar holes during injection molding, and to perform injection molding according to the complete surface of the product. After the product is taken out, another punching device is used to punch out the radar hole in the bumper. This practice can effectively avoid the generation of weld marks. However, this method will also produce new defects, that is, it is necessary to add subsequent punching processes and equipment, which prolongs the production cycle, increases production costs, and reduces production efficiency. Utility Model Content

[0005] In view of the above problems, the utility model aims to provide an in-mold cutting structure of an automobile bumper radar hole injection mold, which has a novel structure and can inject a bumper shell without weld marks in a set of molds and punch out a radar hole in the mold.

[0006] The technical solution of the utility model is an in-mold cutting structure of an injection mold for a radar hole of an automobile bumper, comprising a cavity plate located on the upper side of a product, a core plate and a core insert located on the lower side of the product, the cavity plate being provided with a punching mechanism at a position above the radar hole of the product corresponding to the mold, the core insert being provided with a circular groove directly below the radar hole of the product corresponding to the mold, the punching mechanism comprising a main connecting block, a secondary connecting block, a positioning core rod, a cylinder and a sleeve-shaped punching cutter, the main connecting block being connected to the cavity plate by screws, the positioning core rod being fixedly connected to the bottom surface of the middle portion of the main connecting block, the cylinder being arranged in the main connecting block and the cylinder rod being connected to the secondary connecting block after passing through the bottom surface of the main connecting block, the bottom surface of the secondary connecting block being connected with a sleeve-shaped punching cutter, the positioning core rod being located in the inner hole of the sleeve-shaped punching cutter and the inner and outer diameters of the two being matched.

[0007] Preferably, the side surface of the circular groove is an inclined arc surface.

[0008] Preferably, a T-shaped slot is provided on the bottom surface of the auxiliary connection block, and an annular protrusion is provided on the top of the sleeve-shaped punching cutter, and the sleeve-shaped punching cutter is engaged in the T-shaped slot through the annular protrusion on the top thereof.

[0009] Preferably, the number of the punching mechanism and the number of the circular groove are both two, which are respectively located at the left and right positions of the top of the core insert.

[0010] Preferably, there are two cylinders, which are respectively arranged on the left and right sides of the positioning core rod.

[0011] The utility model has a novel structure, can injection mold a bumper shell without welding marks in a set of molds and punch out radar holes in the mold, omitting the need for subsequent punching equipment and processes, and improving production efficiency while ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the product structure of a car bumper shell;

[0013] Figure 2 It is a schematic diagram of the structure of the utility model;

[0014] Figure 3 for Figure 2 Schematic diagram of the structure after removing the cavity plate;

[0015] Figure 4 for Figure 3 The structural diagram after removing the main connection block on the left;

[0016] Figure 5 for Figure 3 Schematic diagram of the structure after removing the product and the blanking mechanism on the left;

[0017] Among them: 1—cavity plate; 2—core insert; 21—circular groove; 3—punching mechanism; 31—main connecting block; 32—auxiliary connecting block; 321—T-slot; 33—positioning core rod; 34—cylinder; 35—sleeve-shaped punching knife. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] like Figures 2 to 5As shown, the utility model provides an in-mold cutting structure of an injection mold for a radar hole of an automobile bumper, comprising a cavity plate 1 located on the upper side of a product, a core plate and a core insert 2 located on the lower side of the product, the cavity plate 1 is provided with a punching mechanism 3 at a position above the radar hole of the product corresponding to the position, the core insert 2 is provided with a circular groove 21 directly below the radar hole of the product corresponding to the position, the punching mechanism 3 comprises a main connecting block 31, a secondary connecting block 32, a positioning core rod 33, a cylinder 34 and a sleeve-shaped punching cutter 35, the main connecting block 31 is connected to the cavity plate 1 by screws, the positioning core rod 33 is fixedly connected to the bottom surface of the middle part of the main connecting block 31, the cylinder 34 is arranged in the main connecting block 31 and the cylinder rod is connected to the secondary connecting block 32 after passing through the bottom surface of the main connecting block 31, the bottom surface of the secondary connecting block 32 is connected with a sleeve-shaped punching cutter 35, the positioning core rod 33 is located in the inner hole of the sleeve-shaped punching cutter 35 and the inner and outer diameters of the two are matched.

[0020] The side surface of the circular groove 21 is an inclined arc surface.

[0021] Specifically, a T-shaped slot 321 is provided on the bottom surface of the auxiliary connection block 32 , and an annular protrusion is provided on the top of the sleeve-shaped punching knife 35 . The sleeve-shaped punching knife 35 is engaged in the T-shaped slot 321 through the annular protrusion on the top thereof.

[0022] In addition, the number of the punching mechanism 3 and the circular groove 21 are both two, which are respectively located at the left and right positions of the top of the core insert 2.

[0023] Furthermore, there are two cylinders 34 , which are respectively disposed on the left and right sides of the positioning core rod 33 .

[0024] The working principle of the utility model is as follows: after the mold is closed and the injection molding is completed, the product is cooled and formed, and the cylinder 34 controls the auxiliary connecting block 32 to move downward, driving the sleeve-shaped punching knife 35 to punch downward to punch holes in the product. When the sleeve-shaped punching knife 35 moves downward into place, it corresponds to the edge position of the circular groove 21 to achieve the punching action, and then the cylinder 34 is reset, and then the mold is opened, the cavity plate 1 leaves the core plate and the core insert 2, and the bumper shell product is taken out. At this time, no welding marks will appear on the surface of the bumper shell product, and there is no need to undergo subsequent punching process, which ensures the high quality of the product while simplifying the process and improving production efficiency.

[0025] The above is only a preferred implementation mode of the utility model, and does not impose any form of limitation on the utility model. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the utility model still falls within the scope of the technical solution of the utility model.

Claims

1. An in-mold cutting structure of an automobile bumper radar hole injection mold, comprising a cavity plate (1) located on the upper side of a product, a core plate and a core insert (2) located on the lower side of the product, characterized in that; The cavity plate (1) is provided with a punching mechanism (3) at a position above the product radar hole, and the core insert block (2) is provided with a circular groove (21) just below the product radar hole. The punching mechanism (3) comprises a main connection block (31), a secondary connection block (32), a positioning core rod (33), a cylinder (34) and a sleeve-shaped punching cutter (35). The main connection block (31) is connected to the cavity plate (1) by screws, the positioning core rod (33) is fixedly connected to the middle bottom surface of the main connection block (31), the cylinder (34) is arranged in the main connection block (31) and the cylinder rod passes through the bottom surface of the main connection block (31) and is connected to the secondary connection block (32). The bottom surface of the secondary connection block (32) is connected with a sleeve-shaped punching cutter (35), and the positioning core rod (33) is located in the inner hole of the sleeve-shaped punching cutter (35), and the inner and outer diameters of the two are matched.

2. The in-mold cutting structure of the automobile bumper radar hole injection mold according to claim 1, characterized in that: The side surface of the circular groove (21) is an inclined arc surface.

3. The in-mold cutting structure of the automobile bumper radar hole injection mold according to claim 1, characterized in that: The bottom surface of the auxiliary connection block (32) is provided with a T-shaped slot (321), the top of the sleeve-shaped punching knife (35) is provided with an annular protrusion, and the sleeve-shaped punching knife (35) is engaged in the T-shaped slot (321) via the annular protrusion on the top thereof.

4. The in-mold cutting structure of the automobile bumper radar hole injection mold according to claim 1, characterized in that: The blanking mechanisms (3) and circular grooves (21) are both provided in two numbers, and are respectively located at left and right positions on the top of the core insert (2).

5. The in-mold cutting structure of the automobile bumper radar hole injection mold according to claim 1, characterized in that: There are two cylinders (34), which are respectively arranged on the left and right sides of the positioning core rod (33).

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