A mold structure for automobile blow-molded dust cover

Abstract

The utility model discloses a kind of mould structure of automobile blow mould dust cover, it is related to mould technical field, including upper fixed seat, the lower surface of upper fixed seat is equipped with guide pillar, the lower surface of guide pillar is connected with lower fixed seat;The upper surface of lower fixed seat is fixed with mould lower fixed plate, the lower surface of upper fixed seat is fixed with mould upper fixed plate;The lower surface of mould upper fixed plate is equipped with upper die plate, the upper surface of mould lower fixed plate is equipped with lower die plate;One end of dust cover is equipped with first insert, the both ends of upper die plate and lower die plate are equipped with mould neck ring;The utility model increases a first insert between upper die plate, lower die plate and mould neck ring, solve the problem of difficult gas burning produced in blow moulding process, simultaneously, after increasing first insert, first insert can be individually processed, using the method of five-axis numerical milling processing, reduce processing cost.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a mold structure for an automotive blow-molded dust cover. Background Technology

[0002] In the automotive parts manufacturing industry, blow molding is widely used in the mass production of automotive blow-molded dust covers because it can efficiently produce complex hollow structural parts. As a core component that protects key parts such as the automotive transmission system and suspension system, the automotive blow-molded dust cover must have stable structural strength and sealing performance. Its molding quality directly affects the component protection effect and overall reliability during vehicle operation.

[0003] Current molds for blow-molded automotive dust covers are mainly composed of core components such as upper and lower mold plates and a mold neck ring. After the mold plates are closed, a cavity matching the shape of the dust cover is formed, and high-pressure gas is then introduced into the cavity to complete the blow molding process. However, the existing molds use an integrated design where the upper and lower mold plates and the mold neck ring are joined together without a dedicated gas venting structure. This causes air in the cavity to easily get trapped in the gap between the mold plates and the mold neck ring during the blow molding process, resulting in "trapped air." With the continuous heating and pressure during the molding process, the trapped air is repeatedly compressed and heated. When the temperature exceeds the material's tolerance limit, it can easily cause localized scorching of the material, resulting in defects such as scorch marks and bubbles on the surface of the dust cover. This seriously affects the product's appearance and mechanical properties, increasing the defect rate. In the existing mold structure, the mold plates are machined as a whole, and the blow-molded dust cover suffers from trapped air and scorching defects (as shown in Figure 5). This leads to long mold processing cycles and high costs, making it difficult to meet the cost and efficiency requirements of large-scale production of automotive parts.

[0004] Patent CN213675390U discloses a high-efficiency extrusion molding die for an automobile dust cover. The die consists of fixed bases on both sides of the top of the worktable, with one end of each fixed base connected to a die holder via a cylinder. A base is fixedly connected to the middle of the top of the worktable, and an air blower is fixedly mounted on the top of the base. A pad is fixedly connected to the top of the air blower, and a protective cover is fixedly connected to the top of the pad.

[0005] However, this patent has the following drawbacks: In the mold structure of the car dust cover, the template is processed as a whole, which can lead to entrapment and scorching during the blow molding process of the dust cover. Utility Model Content

[0006] To address the technical problems in existing technologies where the mold for automotive blow-molded dust covers is manufactured as a single piece, resulting in defects such as trapped air and scorching due to mold structure issues, and the increased overall processing cost due to the need for chemical etching processes for engraving the template cavity, this utility model provides a mold structure for automotive blow-molded dust covers.

[0007] The objective of this utility model can be achieved through the following technical solutions: A mold structure for a blow-molded dust cover for automobiles includes an upper fixed base, a guide post on the lower surface of the upper fixed base, and a lower fixed base connected to the lower surface of the guide post; a lower mold fixed plate is fixedly mounted on the upper surface of the lower fixed base, and an upper mold fixed plate is fixedly mounted on the lower surface of the upper fixed base; an upper template is mounted on the lower surface of the upper mold fixed plate, and a lower template is mounted on the upper surface of the lower mold fixed plate; a first insert is provided at one end of the dust cover, and mold neck rings are provided at both ends of the upper and lower templates.

[0008] Furthermore, both the upper and lower templates have loop-shaped water channels on their surfaces, and both the upper and lower templates have cavities in the middle of opposite sides, with matching dust covers inside the cavities.

[0009] Furthermore, the first insert is circular in shape, with an aluminum core running through its center. The aluminum core is coaxial with the first insert, and the outer wall of the first insert has excess material.

[0010] Furthermore, both the upper and lower templates have limiting grooves at the first insert. The limiting grooves are located on opposite sides of the upper and lower templates and are configured to cooperate with the first insert.

[0011] Furthermore, the mold neck ring is located on the opposite side of the upper and lower mold plates. After the mold neck rings on the upper and lower mold plates are closed, they form a frustum shape. A frustum-shaped hole is opened through the inside of the mold neck ring, and the frustum-shaped hole is connected to the cavity.

[0012] Furthermore, the upper and lower templates are provided with a second insert on opposite sides. The second insert is located at the end near the aluminum core and wraps around the outer wall of the mold neck ring. The end of the second insert near the dust cover is in contact with one side of the first insert. Clamping grooves are provided on both sides of the mold neck ring.

[0013] The beneficial effects of this utility model are: This invention adds a first insert between the upper template, lower template, and neck ring, which solves the problem of trapped gas and scorching during the blow molding process. At the same time, after adding the first insert, the first insert can be processed separately using a five-axis CNC milling method, reducing processing costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the connection between the upper fixing plate and the upper template of the mold of this utility model; Figure 3 This is a front sectional view of the present invention; Figure 4 This is an exploded view of the structure of this utility model; Figure 5 This is a schematic diagram of the existing structure of the automotive blow molding dust cover mold of this utility model.

[0015] The attached diagram lists the components represented by each number as follows: 1. Upper fixed seat; 2. Lower fixed seat; 201. Guide pillar; 3. Upper fixed plate of mold; 301. Water channel; 4. Lower fixed plate of mold; 401. Cavity; 402. Limiting groove; 7. Lower template; 8. Upper template; 9. Mold neck ring; 10. Dust cover; 11. First insert; 12. Second insert; 13. Aluminum core; 14. Clamping groove; 15. Residual material. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-4 As shown, a mold structure for a blow-molded dust cover for automobiles includes an upper fixed seat 1. The lower surface of the upper fixed seat 1 is provided with guide pillars 201, which are symmetrically arranged. The lower surface of the guide pillars 201 is connected to a lower fixed seat 2. The upper fixed seat 1 and the lower fixed seat 2 are symmetrically arranged. One end of the upper fixed seat 1 and the lower fixed seat 2 is approximately "V" shaped, and the other end of the upper fixed seat 1 and the lower fixed seat 2 is square.

[0018] The lower fixing plate 4 of the mold is fixedly installed on the upper surface of the lower fixing base 2 near the square end, and the upper fixing plate 3 of the mold is fixedly installed on the lower surface of the upper fixing base 1 near the square end; the upper fixing plate 3 and the lower fixing plate 4 of the mold are both convex in shape.

[0019] The upper surface of the upper fixing plate 3 of the mold is provided with an upper template 8, and the upper surface of the lower fixing plate 4 of the mold is provided with a lower template 7. Both the upper template 8 and the lower template 7 are provided with loop-shaped water channels 301. The water channels 301 are embedded in the interior of the upper template 8 and the lower template 7 to ensure that the water channels 301 can evenly cover the upper template 8 and the lower template 7, thereby achieving temperature control of the template.

[0020] The upper mold plate 8 and the lower mold plate 7 are each provided with a cavity 401 in the middle of their opposite sides. A matching dust cover 10 is provided in the cavity 401. After the cavities 401 of the upper mold plate 8 and the lower mold plate 7 are closed, they form a complete sealed space. The dust cover 10 is set in the sealed cavity 401 and its shape is completely matched with the cavity 401. It is the carrier for blow molding.

[0021] The cavities 401 in the upper mold 8 and the lower mold 7 provide space for the upper structure of the dust cover 10 to be formed. At the same time, the integrated water channel 301 realizes temperature control, ensuring that the plastic raw material can be formed at the appropriate temperature during the blow molding process, and avoiding problems such as scorching and deformation of the raw material due to improper temperature.

[0022] One end of the dust cover 10 is provided with a first insert 11. The first insert 11 is circular in shape. An aluminum core 13 is provided through the center of the first insert 11. The aluminum core 13 is coaxially arranged with the first insert 11. The outer wall of the first insert 11 is provided with excess material 15.

[0023] The upper template 8 and the lower template 7 are provided with limiting grooves 402 at the first insert 11. The limiting grooves 402 are located on the opposite side of the upper template 8 and the lower template 7, and the limiting grooves 402 are configured to cooperate with the first insert 11.

[0024] The excess material 15 is a process byproduct of blow molding. It is located on the outer wall of the first insert 11. It is a structure formed by the excess part of the plastic raw material when it flows and fills the cavity 401. It can ensure that the raw material in the cavity 401 is fully filled and avoid the dust cover 10 from having a material shortage defect due to insufficient raw material.

[0025] Adding a first insert 11 between the upper mold plate 8, the lower mold plate 7, and the mold neck ring 9 solves the problem of trapped gas and scorching during the blow molding process. At the same time, after adding the first insert 11, the first insert 11 can be processed separately using a five-axis CNC milling method, which reduces the processing cost.

[0026] The upper mold plate 8 and the lower mold plate 7 are provided with mold neck rings 9 at both ends. The mold neck rings 9 are located on the opposite side of the upper mold plate 8 and the lower mold plate 7. After the mold neck rings 9 on the upper mold plate 8 and the lower mold plate 7 are closed, they form a frustum shape. A frustum-shaped hole is opened through the interior of the mold neck ring 9. The frustum-shaped hole is connected to the cavity 401 and is a channel for the injection of plastic raw materials or the discharge of gas.

[0027] The upper template 8 and lower template 7 near one end of the aluminum core 13 are provided with a second insert 12 on the opposite side. The second insert 12 wraps around the outer wall of the mold neck ring 9. The end of the second insert 12 near the dust cover 10 is in contact with one side of the first insert 11. The mold neck ring 9 is provided with clamping grooves 14 on both sides.

[0028] The clamping groove 14 is mainly used for mold closing positioning and waste collection. When the mold is closed, the clamping groove 14 of the upper mold plate 8 and the lower mold plate 7 cooperate to help position the mold neck ring 9. At the same time, a small amount of overflowing plastic material will enter the clamping groove 14 during the blow molding process, forming edge material.

[0029] The second insert 12 wraps around the outer wall of the mold neck ring 9, enhancing the installation stability of the mold neck ring 9 and preventing the mold neck ring 9 from shifting during the molding process. At the same time, the contact structure between the second insert 12 and the first insert 11 can fill the gap between the components, improve the overall sealing of the mold, and prevent material leakage during blow molding.

[0030] Working principle: The upper fixed seat 1 is guided to move downward by the guide post 201. At this time, the upper fixed plate 3 and the lower fixed plate 4 of the mold move closer to each other, which drives the upper template 8 and the lower template 7 to gradually close. During the closing process of the template, the limiting groove 402 and the first insert 11 are engaged; so that the mold neck ring 9 closes to form a frustum-shaped structure, and its internal frustum-shaped hole is connected to the cavity 401.

[0031] During the injection process, excess material forms a residue 15 in this area, and the side of the residue 15 closest to the aluminum core 13 is in direct contact with the surface of the aluminum core 13, ensuring that the material inside the cavity 401 is fully filled and avoiding material shortage defects in the dust cover 10 due to insufficient material. While the material fills the cavity 401, the loop-shaped water channel 301 embedded in the upper mold plate 8 and the lower mold plate 7 starts to work. The circulating medium (such as cooling water or hot oil) flows in the water channel 301 and evenly covers the entire mold plate. During the material filling and shaping process, the air in the cavity 401 is discharged outward through the trapezoidal hole of the mold neck ring 9. At the same time, the first insert 11 fills the gap between the cavity 401 and the mold neck ring 9, optimizes the gas discharge path, effectively solves the problem of trapped air that is easy to occur in blow molding, further prevents local material from scorching due to high temperature, and ensures that the surface of the dust cover 10 is smooth and free of bubbles.

[0032] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A mold structure for a blow-molded dust cover for automobiles, comprising an upper fixed seat (1), a guide post (201) provided on the lower surface of the upper fixed seat (1), and a lower fixed seat (2) connected to the lower surface of the guide post (201); characterized in that, The lower fixing plate (4) of the mold is fixedly provided on the upper surface of the lower fixing base (2), and the upper fixing plate (3) of the mold is fixedly provided on the lower surface of the upper fixing base (1); the upper template (8) of the upper fixing plate (3) of the mold is provided on the lower surface of the mold, and the lower template (7) of the lower fixing plate (4) of the mold is provided on the upper surface of the mold; the dust cover (10) is provided with a first insert (11) at one end, and the upper template (8) and the lower template (7) are provided with mold neck rings (9) at both ends.

2. The mold structure for an automotive blow-molded dust cover according to claim 1, characterized in that, The surfaces of the upper template (8) and the lower template (7) are provided with loop-shaped water channels (301). The upper template (8) and the lower template (7) are provided with cavities (401) in the middle of opposite sides. Matching dust covers (10) are provided in the cavities (401).

3. The mold structure for an automotive blow-molded dust cover according to claim 2, characterized in that, The first insert (11) is circular in shape, and an aluminum core (13) is provided through the center of the first insert (11). The aluminum core (13) is coaxially arranged with the first insert (11), and the outer wall of the first insert (11) is provided with excess material (15).

4. The mold structure for an automotive blow-molded dust cover according to claim 3, characterized in that, The upper template (8) and the lower template (7) are both provided with limiting grooves (402) at the first insert (11). The limiting grooves (402) are located on the opposite side of the upper template (8) and the lower template (7), and the limiting grooves (402) are configured to cooperate with the first insert (11).

5. The mold structure for an automotive blow-molded dust cover according to claim 4, characterized in that, The mold neck ring (9) is located on the opposite side of the upper template (8) and the lower template (7). After the mold neck ring (9) on the upper template (8) and the lower template (7) are closed, they form a frustum shape. A frustum-shaped hole is opened through the interior of the mold neck ring (9), and the frustum-shaped hole is connected to the cavity (401).

6. The mold structure for an automotive blow-molded dust cover according to claim 5, characterized in that, The upper template (8) and the lower template (7) are provided with a second insert (12) on the opposite side. The second insert (12) is located at one end close to the aluminum core (13) and wraps the outer wall of the mold neck ring (9). The end of the second insert (12) close to the dust cover (10) is in contact with one side of the first insert (11). The mold neck ring (9) is provided with clamping grooves (14) on both sides.

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