Die for automobile plastic part

Abstract

The utility model discloses a mold for an automobile plastic part, relates to the field of injection molds, and aims to solve the problem that in the prior art, a single-point ejection mode of an ejection rod is mostly adopted by an ejection mechanism on the existing injection mold, but the contact area of the ejection rod and the molded plastic part is small, so that the plastic part is easy to deform during ejection. A mold groove is formed in the middle of the upper end face of the lower mold, an I-shaped groove is formed in the lower end face in the mold groove, an I-shaped ejector rod is arranged at the upper end of the I-shaped groove, and rectangular movable grooves are formed in the front ends and the rear ends of the two sides of the I-shaped groove and located in the front end face and the rear end face in the mold groove correspondingly. And the front ends and the rear ends of the two sides of the I-shaped ejector rods extend into the four rectangular movable grooves correspondingly and are fixedly connected with rectangular linkage columns, the upper ends of the rectangular linkage columns extend out of the upper end face of a lower mold, and an upper mold is arranged at the upper end of the lower mold.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, and specifically relates to a mold for automobile plastic parts. Background Technique

[0002] An injection mold is a special tool used in the plastic injection molding process. By injecting heated and molten plastic into the mold cavity, and after cooling and solidifying, the finished product is obtained. It is widely used in the production of plastic parts and products, especially suitable for mass production of products with complex geometric shapes and high-precision requirements, such as automotive parts, electronic enclosures, household appliances, toys, etc. The composition structure of an injection mold usually includes several steel plates cooperating with various parts, such as an ejection system, a cooling system, etc. Its working principle is to inject molten plastic into the mold cavity. After cooling and shaping, the product is taken out of the mold cavity through the ejection system, completing an injection cycle. The entire injection process is carried out cyclically and is suitable for mass production.

[0003] For example, the authorized announcement number is CN216182372U, an injection mold for automobile plastic parts, including a base. Four corners of the lower end of the base are fixedly connected with support feet. The left part and the right part of the upper end of the base are both fixedly connected with support plates, and chutes are opened in the middle of the opposite surfaces of the two support plates. A lower mold structure is movably inserted and connected together between the chutes. The middle part of the lower end of the base is fixedly connected with a cylinder. The output end of the cylinder penetrates through the middle part of the upper end of the base and is fixedly connected with a cushion block. The upper end of the cushion block is fixedly connected with the lower mold structure. Four support rods are fixedly connected to the upper end of the base at equal distances, and a fixing plate is fixedly connected to the upper ends of the four support rods together. The middle part of the lower end of the fixing plate is fixedly connected with an upper mold structure. The displacement of the utility model has high stability, good molding quality, can quickly export the molded parts, and improves the processing efficiency of automobile plastic parts.

[0004] Most of the existing ejection mechanisms on injection molds adopt the single-point ejection method of ejection rods, but the contact area between the ejection rods and the molded plastic parts is small, which is likely to cause the plastic parts to deform during ejection. Therefore, there is an urgent need in the market to develop a mold for automobile plastic parts to help people solve the existing problems. Summary of the Invention

[0005] The purpose of the utility model is to provide a mold for automobile plastic parts to solve the problem that most of the existing ejection mechanisms on injection molds adopt the single-point ejection method of ejection rods, but the contact area between the ejection rods and the molded plastic parts is small, which is likely to cause the plastic parts to deform during ejection as mentioned in the above background technique.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A mold for automotive plastic parts, including a lower mold, a mold groove is provided in the middle of the upper end surface of the lower mold, an I-shaped groove is provided on the lower end surface inside the mold groove, an I-shaped ejector rod is provided above the I-shaped groove, rectangular movable grooves are provided at the front and rear ends on both sides of the I-shaped groove and on the front and rear end surfaces inside the mold groove, a guide tube is fixedly connected to the middle of the lower end surface inside the rectangular movable groove, a spring is provided inside the guide tube, the front and rear ends on both sides of the I-shaped ejector rod respectively extend into the four rectangular movable grooves and are fixedly connected with rectangular linkage columns, the upper ends of the rectangular linkage columns extend out of the upper end surface of the lower mold, a circular groove is provided inside the rectangular linkage column, a fixed rod is fixedly provided on the upper end surface inside the circular groove, and an upper mold is provided above the lower mold.

[0007] Preferably, the upper end of the guide tube is inserted into the circular groove of the rectangular linkage column, and the lower end of the fixed rod is inserted into the guide tube.

[0008] Preferably, T-shaped grooves are provided on both sides of the four rectangular movable grooves on the upper end surface of the lower mold, rectangular connecting pieces are provided inside the T-shaped grooves, and the rectangular connecting pieces are fixedly connected to the lower mold by screws inside the T-shaped grooves.

[0009] Preferably, a rectangular limiting part is fixedly connected to the middle of one side of the rectangular connecting piece, and rectangular limiting grooves are provided on both sides after the upper ends of the rectangular linkage columns extend out of the upper end surface of the lower mold.

[0010] Preferably, the rectangular limiting parts on the two rectangular connecting pieces on both sides of the rectangular linkage column are respectively inserted into the two rectangular limiting grooves.

[0011] Preferably, positioning rods are fixedly connected to the front, rear, left, and right ends on both sides of the upper end surface of the lower mold, and positioning grooves are provided in the front, rear, left, and right ends on both sides inside the upper mold.

[0012] Preferably, the upper ends of the four positioning rods are respectively inserted into the four positioning grooves on the upper mold, and a mold core is fixedly connected to the middle of the lower end surface of the upper mold.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] In the utility model, through the arrangement of the I-shaped ejector rod, the four rectangular linkage columns descend and jointly drive the I-shaped ejector rod to descend and insert into the I-shaped groove. When the I-shaped ejector rod is inserted into the I-shaped groove, the upper end surface of the I-shaped ejector rod is flush and fits with the lower end surface of the mold groove, so that after the mold core is inserted into the mold groove, the upper end surface of the I-shaped ejector rod jointly participates in the formation of the injection cavity. When the injection is completed and the plastic part is cooled, the upper mold is lifted, and the spring restoring force pushes the fixed rod to rise, and then the fixed rod pushes the rectangular linkage column to lift, so that the four rectangular linkage columns jointly drive the I-shaped ejector rod to rise, and then the upper end surface of the I-shaped ejector rod pushes the injection molded part out of the mold groove to achieve demolding. The I-shaped ejector rod expands the contact area with the lower end surface of the injection molded part, disperses the ejection force, and prevents the injection molded part from deformation.

[0015] In the utility model, through the setting of the rectangular limiting part, when the rectangular linkage column is raised or lowered, the rectangular limiting part slides along the inside of the rectangular limiting groove. When the rectangular linkage column rises, the rectangular limiting part slides to the lower end of the inside of the rectangular limiting groove. The rectangular limiting part fits the lower end surface of the inside of the rectangular limiting groove to limit the rising degree of the rectangular linkage column, thereby preventing the rectangular linkage column from falling out of the rectangular movable groove. The rectangular connecting piece can be separated by removing the screws, and the rising restriction of the rectangular linkage column is released. The four rectangular linkage columns can be lifted at the same time and separated from the lower mold, which is convenient for maintenance and replacement of the rectangular linkage column, the I-shaped ejector rod and its auxiliary components.

[0016] In this utility model, the lower mold is fixed on the injection molding table by setting a positioning rod, and is connected to the upper mold through a lifting mechanism, which drives the upper mold to descend so that the mold core is inserted into the mold groove. When the upper mold and the lower mold are closed, the gap between the mold core and the mold groove forms an injection cavity, and then the injection operation is performed into the injection cavity. When the upper mold is raised or lowered, it is guided by sliding along the positioning groove through the positioning rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of a mold for automotive plastic parts according to the present utility model;

[0018] Figure 2 This is a side sectional view of the rectangular movable groove of the present utility model;

[0019] Figure 3 This is a main cross-sectional view of the rectangular movable groove of the utility model;

[0020] Figure 4 This is an enlarged view of the detail A of the present invention.

[0021] In the figure: 1. Lower mold; 101. Mold cavity; 102. I-shaped groove; 103. Rectangular movable groove; 104. T-shaped groove; 105. Positioning rod; 2. Guide tube; 201. Spring; 3. I-shaped ejector rod; 301. Rectangular linkage column; 302. Circular groove; 303. Fixed rod; 304. Rectangular limit groove; 4. Rectangular connecting piece; 401. Rectangular limit part; 402. Screw; 5. Upper mold; 501. Mold core; 502. Positioning groove. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Please refer to Figures 1-4 , an embodiment provided by the present invention: A mold for automobile plastic parts, including a lower mold 1. A mold cavity 101 is provided in the middle of the upper end surface of the lower mold 1. Positioning rods 105 are fixedly connected to the front, rear, left, and right ends of the upper end surface of the lower mold 1. Positioning grooves 502 are provided in the front, rear, left, and right ends of both sides inside the upper mold 5. The upper ends of the four positioning rods 105 are respectively inserted into the four positioning grooves 502 inside the upper mold 5. A mold core 501 is fixedly connected to the middle of the lower end surface of the upper mold 5. The lower mold 1 is fixed on the injection molding table, and the upper mold 5 is connected through a lifting mechanism to drive the upper mold 5 to descend, so that the mold core 501 is inserted into the mold cavity 101. When the upper mold 5 and the lower mold 1 are closed, the gap between the mold core 501 and the mold cavity 101 forms an injection cavity, and then injection molding operation is carried out on the injection cavity. When the upper mold 5 is lifted and lowered, it is guided by the positioning rod 105 sliding along the positioning groove 502.

[0024] Please refer to Figures 2 to 4, an I-shaped groove 102 is provided on the lower end surface inside the mold cavity 101. An I-shaped ejector rod 3 is provided at the upper end of the I-shaped groove 102. Rectangular movable grooves 103 are provided at the front and rear ends on both sides of the I-shaped groove 102 and on the front and rear end surfaces inside the mold cavity 101. A guide tube 2 is fixedly connected to the middle of the lower end surface inside the rectangular movable groove 103. A spring 201 is provided inside the guide tube 2. The front and rear ends on both sides of the I-shaped ejector rod 3 extend into the four rectangular movable grooves 103 respectively and are fixedly connected with rectangular linkage columns 301. The upper ends of the rectangular linkage columns 301 extend out of the upper end surface of the lower mold 1. A circular groove 302 is provided inside the rectangular linkage column 301. A fixed rod 303 is fixedly provided on the upper end surface inside the circular groove 302. An upper mold 5 is provided on the upper end of the lower mold 1. The upper end of the guide tube 2 is inserted into the circular groove 302 of the rectangular linkage column 301. The lower end of the fixed rod 303 is inserted into the guide tube 2. When the upper mold 5 descends, the lower end surface of the upper mold 5 will first synchronously press down the upper ends of the four rectangular linkage columns 301. When the upper mold 5 continues to descend, it will synchronously drive the four rectangular linkage columns 301 to descend along the rectangular movable grooves 103, so that the guide tube 2 completely extends into the circular groove 302, and at the same time the fixed rod 303 extends into the guide tube 2 to compress the spring 201. The descent of the four rectangular linkage columns 301 will jointly drive the I-shaped ejector rod 3 to descend and insert into the I-shaped groove 102. After the I-shaped ejector rod 3 is inserted into the I-shaped groove 102, the upper end surface of the I-shaped ejector rod 3 is flush with and fits the lower end surface of the mold cavity 101. After the mold core 501 is inserted into the mold cavity 101, the upper end surface of the I-shaped ejector rod 3 jointly participates in the formation of the injection cavity. When the plastic part is cooled after injection molding, the upper mold 5 is lifted. The fixed rod 303 is pushed to rise by the restoring force of the spring 201, and then the fixed rod 303 pushes the rectangular linkage column 301 to rise, so that the four rectangular linkage columns 301 jointly drive the I-shaped ejector rod 3 to rise, and then the upper end surface of the I-shaped ejector rod 3 ejects the injection molded part out of the mold cavity 101 to realize demolding. The contact area with the lower end surface of the injection molded part is enlarged by the I-shaped ejector rod 3, and the ejection force is dispersed to prevent the injection molded part from deforming.

[0025] Please refer to Figure 3 and Figure 4, the upper end surface of the lower mold 1 is provided with T-slots 104 on both sides of the four rectangular movable grooves 103, a rectangular connecting piece 4 is provided inside the T-slot 104, the rectangular connecting piece 4 is fixedly connected to the lower mold 1 inside the T-slot 104 by screws 402, and a rectangular limiting portion 401 is fixedly connected to the middle part of one side of the rectangular connecting piece 4. The upper end of the rectangular linkage column 301 extends out of the upper end surface of the lower mold 1 and is provided with rectangular limiting grooves 304 on both sides. The rectangular limiting portions 401 on the two rectangular connecting pieces 4 on both sides of the rectangular linkage column 301 are respectively inserted into the two rectangular limiting grooves 304. When the rectangular linkage column 301 is raised or lowered, the rectangular limiting portion 4 01 slides along the inside of the rectangular limit groove 304. When the rectangular linkage column 301 rises, the rectangular limit part 401 slides to the lower end of the rectangular limit groove 304. The rectangular limit part 401 fits the lower end surface of the rectangular limit groove 304 to limit the rising degree of the rectangular linkage column 301, preventing the rectangular linkage column 301 from falling out of the rectangular movable groove 103. The rectangular connecting piece 4 can be separated by removing the screw 402, and the rising limit of the rectangular linkage column 301 is released. The four rectangular linkage columns 301 can be lifted at the same time and separated from the lower mold 1, which is convenient for maintenance and replacement of the rectangular linkage column 301 and the I-shaped ejector rod 3 and its auxiliary components.

[0026] Working principle: When in use, first fix the lower mold 1 on the injection molding table, and drive the upper mold 5 to descend through the lifting mechanism, so that the mold core 501 is accurately inserted into the mold groove 101, and at the same time, the lower end surface of the upper mold 5 will synchronously press down the upper ends of the four rectangular linkage columns 301. As the upper mold 5 continues to descend, the four rectangular linkage columns 301 descend steadily along the rectangular movable groove 103 until the guide tube 2 is completely extended into the circular groove 302, and the fixed rod 303 extends into the guide tube 2 and compresses the spring 201. At this time, the I-shaped ejector rod 3 is driven down by the four rectangular linkage columns 301 and accurately inserted into the I-shaped groove 102, ensuring that the upper end surface of the I-shaped ejector rod 3 is flush and fits with the lower end surface of the mold groove 101 to form a complete injection cavity. After injection molding is complete and the plastic part cools, the upper mold 5 is raised. The restoring force of spring 201 pushes the fixed rod 303 upward, which in turn drives the four rectangular linkage columns 301 to rise synchronously. Ultimately, the upper end surface of the I-shaped ejector rod 3 smoothly ejects the molded part from the mold cavity 101, achieving an efficient, deformation-free demolding process. Furthermore, the coordination between the rectangular stopper 401 and the rectangular stopper slot 304 ensures the stability and accuracy of the rectangular linkage columns 301 during the lifting process. The detachable connection between the rectangular connecting piece 4, the T-slot 104, and the screw 402 facilitates quick maintenance and replacement of the rectangular linkage columns 301 and their associated components.

[0027] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A mold for automotive plastic parts, including a lower mold (1), characterized in that: The middle of the upper end face of the lower mold (1) is provided with a mold groove (101), the lower end face of the mold groove (101) is provided with an I-shaped groove (102), the upper end of the I-shaped groove (102) is provided with an I-shaped ejector rod (3), the front and rear ends of both sides of the I-shaped groove (102) and the front and rear end faces of the mold groove (101) are provided with rectangular movable grooves (103), the middle of the lower end face of the rectangular movable groove (103) is fixedly connected with a guide tube (2), the guide tube (2) is provided with a guide tube (2) inside. A spring (201) is provided. The front and rear ends of both sides of the I-shaped ejector rod (3) extend into the interior of four rectangular movable grooves (103) and are fixedly connected to rectangular linkage columns (301). The upper ends of the rectangular linkage columns (301) extend out of the upper end surface of the lower mold (1). A circular groove (302) is provided inside the rectangular linkage column (301). A fixing rod (303) is fixedly provided on the upper end surface of the circular groove (302). The upper end of the lower mold (1) is provided with an upper mold (5).

2. The mold for automotive plastic parts according to claim 1, characterized in that: The upper end of the guide tube (2) is inserted into the circular groove (302) of the rectangular linkage column (301), and the lower end of the fixing rod (303) is inserted into the guide tube (2).

3. The mold for automotive plastic parts according to claim 1, characterized in that: T-shaped slots (104) are provided on the upper end surface of the lower mold (1) and on both sides of the four rectangular movable slots (103). Rectangular connecting pieces (4) are provided inside the T-shaped slots (104). The rectangular connecting pieces (4) are fixedly connected to the lower mold (1) inside the T-shaped slots (104) by screws (402).

4. The mold for automotive plastic parts according to claim 3, characterized in that: A rectangular limiting portion (401) is fixedly connected to the middle of one side of the rectangular connecting piece (4), and the upper end of the rectangular linkage column (301) extends out of the upper end surface of the lower mold (1) and is provided with rectangular limiting grooves (304) on both sides.

5. The mold for automotive plastic parts according to claim 4, characterized in that: The rectangular limiting portions (401) on the two rectangular connecting pieces (4) on both sides of the rectangular linkage column (301) are respectively inserted into the interiors of the two rectangular limiting grooves (304).

6. The mold for automobile plastic parts according to claim 1, characterized in that: Positioning rods (105) are fixedly connected to both front and rear ends of the upper end surface of the lower mold (1), and positioning grooves (502) are provided on both front and rear ends of the interior of the upper mold (5).

7. The mold for automotive plastic parts according to claim 6, characterized in that: The upper ends of the four positioning rods (105) are respectively inserted into the four positioning grooves (502) on the upper mold (5), and the middle part of the lower end surface of the upper mold (5) is fixedly connected with a mold core (501).

Images