Injection mold for automobile bottom plaque
By using a diverter and a crisscross injection cavity structure in the injection mold of the automobile bottom trim, the problems of slow molten plastic flow and insufficient pouring pressure were solved, achieving high-quality injection molding.
Patent Information
- Application Number
- CN202510933016.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-08
- Publication Date
- 2025-09-09
AI Technical Summary
In the prior art, during the injection molding process of the grille area of the bottom trim panel of a car, the pouring gate is located at the edge of the mold groove, resulting in a slow flow of the molten plastic and insufficient pouring pressure in the deviated area, which is prone to leakage and melt marks, affecting product quality.
An injection mold for automobile underbody trim panels is designed. It adopts a diverter and a criss-cross injection cavity structure. The diverter diverts the molten plastic from the longitudinal injection cavity to the transverse injection cavity, increasing the pouring pressure in the deviated area. The elastic sheath and spiral push rod ensure flow stability to avoid leakage and imprinting.
The invention realizes increasing the pouring pressure in the deviation area during the injection molding process, avoiding leakage and melting marks, and improving the integrity and quality of the injection molded product.
Smart Images
Figure CN120606506A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of injection molding, in particular to an injection mold for an automobile bottom trim panel. Background Art
[0002] To ensure the appearance of the grille area of the car, the injection molding process is usually used for manufacturing. However, since the grille area usually has a complex mesh structure, when the conventional injection molding machine is used for injection molding, the sprue is located at the edge of the mold groove. The large pouring runner causes the molten plastic to deviate from the pouring area of the sprue when flowing. The molten plastic flows slowly, and the deviated area is not subjected to sufficient pouring pressure, which leads to leakage in the injection molded product and melt marks, which affect the appearance and product quality of the plastic part.
[0003] Therefore, an automobile bottom trim injection mold is proposed. Summary of the Invention
[0004] In view of the deficiencies in the prior art, the present invention provides an injection mold for an automobile bottom trim panel, which has advantages and solves the problems.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection mold for an automobile bottom trim panel, comprising a front template and a rear membrane plate, wherein the front template and the rear membrane plate are respectively connected with a first connecting seat and a second connecting seat, wherein the surface of the front template is provided with a plurality of first longitudinal injection cavities and a plurality of first transverse injection cavities, and the surface of the rear membrane plate is provided with a plurality of second transverse injection cavities and a plurality of second longitudinal injection cavities, and a diverter is provided in each of the plurality of second longitudinal injection cavities. After the front template and the rear membrane plate are bonded together, the first longitudinal injection cavity and the first transverse injection cavity are bonded one-to-one with the second transverse injection cavity and the second longitudinal injection cavity to form criss-cross injection cavities, and the diverter comprises a main base, and a receiving bucket arranged on the top of the base, wherein the receiving bucket is made of an elastic metal sheet, and the base The interior of the diverter is docked with the receiving bucket, and an opening is provided on each side of the base. The diverter slides from top to bottom in the longitudinal injection cavity, and the diverter guides the flowing molten plastic in the longitudinal injection cavity to the transverse injection cavities on both sides through the opening. The provided diverter can guide the molten plastic near the pouring gate to the area deviating from the pouring gate in advance, so as to increase the pouring pressure in the deviated area to form a complete cast product; the movement of the diverter gradually moves away from the pouring gate, but does not deviate from the main pouring flow channel, and can always bear the pouring pressure of the main flow channel. In the process of gradually moving away from the pouring, the transverse injection cavities on both sides of the corresponding nodes will be filled with molten plastic as it passes through several nodes, so as to avoid leakage and melt marks.
[0006] Preferably, the outside of the base is covered with an elastic sheath, which is embedded in the longitudinal injection cavity formed by the front template and the rear membrane plate, and fits the inner wall of the injection cavity. The longitudinal injection cavity is not a straight line, but may be an arc-shaped structure. During the movement of the base, the elastic sheath can ensure that the base fits tightly with the injection cavity, avoids premature leakage of molten plastic, and increases the injection pressure of the base to divert to both sides.
[0007] Preferably, a plurality of spiral push rods are provided on the diverter, two first spiral push rods are provided in the receiving bucket, and two second spiral push rods are provided in the base. The output directions of the two first spiral push rods are toward the base, and the two second spiral push rods are located at the opening of the base and output to both sides respectively.
[0008] Preferably, a telescopic sleeve is provided at each of the openings on both sides of the base, and the two telescopic sleeves are elastically expanded to both sides and respectively wrap a second spiral push rod therein. When the elastic telescopic sleeve moves to the node, it expands to both sides to facilitate the operation of the second spiral rod, and the molten plastic is introduced into the horizontal injection cavity through the telescopic sleeve, while reducing the molten plastic from leaking downward through the diverter at the node.
[0009] Preferably, the outer side of the edge of the telescopic sleeve is a table-shaped structure, and the edge is embedded in the connection node of the transverse injection cavity and the longitudinal injection cavity. When the telescopic sleeve continues to move downward, the table-shaped structure is pushed inward by the node and automatically shrinks into the elastic sleeve, making it convenient to continue moving downward.
[0010] Preferably, the rear membrane plate is provided with a plurality of tail grooves connected to the second longitudinal injection cavity. The tail grooves are located at the tail of the second longitudinal injection cavity and extend to the edge of the rear membrane plate, providing air exhaust outlets for the injection of molten plastic and serving as a disengagement channel for the diverter.
[0011] Preferably, when the diverter slides up and down in the second longitudinal injection cavity, it can move into the tail groove and detach from the rear membrane plate from the tail groove.
[0012] Preferably, a micro motor is provided in the base to drive the two first screw push rods and the two second screw push rods to rotate respectively.
[0013] Compared with the prior art, the present invention provides an automobile bottom trim injection mold, which has the following beneficial effects: 1. The diverter can guide the molten plastic near the pouring gate to the area away from the pouring gate in advance, so as to increase the pouring pressure in the deviated area and form a complete cast product.
[0014] 2. The movement of the diverter gradually moves away from the pouring gate, but will not deviate from the main pouring channel. It can always bear the pouring pressure of the main channel. In the process of gradually moving away from the pouring, the horizontal injection cavity on both sides of each node will be filled with molten plastic when it passes through several nodes, so as to avoid leakage and melt marks. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the overall appearance structure of an automobile bottom trim injection mold of the present invention; Figure 2 This is a schematic diagram of the back appearance structure of an injection mold for an automobile bottom trim panel according to the present invention; Figure 3 This is a structural schematic diagram of a front template of an injection mold for an automobile bottom trim panel according to the present invention; Figure 4 This is a structural schematic diagram of a rear mold section of an automobile bottom trim injection mold according to the present invention; Figure 5 This is a structural schematic diagram of a flow divider for an injection mold of an automobile bottom trim panel according to the present invention; Figure 6 This is a schematic diagram of the telescopic structure of a telescopic sleeve of an injection mold for an automobile bottom trim panel of the present invention; Figure 7 This is a structural schematic diagram of a base of an injection mold for an automobile bottom trim panel according to the present invention; Figure 8 The figure is a schematic diagram of the internal structure of a base of an injection mold for an automobile bottom trim panel according to the present invention.
[0016] In the picture: 1. Front template; 2. First connecting seat; 3. Rear template; 4. Second connecting seat; 11. First longitudinal injection cavity; 12. First transverse injection cavity; 31. Second transverse injection cavity; 32. Second longitudinal injection cavity; 33. Tail groove; 5. Diverter; 51. Elastic sheath; 52. Receiving bucket; 53. First screw push rod; 54. Telescopic sleeve; 55. Second screw push rod; 56. Base. DETAILED DESCRIPTION
[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0018] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, this application proposes an injection mold for an automobile bottom trim panel.
[0019] Example 1 like Figure 1-8 As shown, an injection mold for an automobile bottom trim panel includes a front template 1 and a rear membrane plate 3, and the front template 1 and the rear membrane plate 3 are respectively connected to a first connecting seat 2 and a second connecting seat 4, wherein the surface of the front template 1 is provided with a plurality of first longitudinal injection cavities 11 and a plurality of first transverse injection cavities 12, and the surface of the rear membrane plate 3 is provided with a plurality of second transverse injection cavities 31 and a plurality of second longitudinal injection cavities 31, and a diverter 5 is provided in each of the plurality of second longitudinal injection cavities 31. After the front template 1 and the rear membrane plate 3 are bonded together, the first longitudinal injection cavity 11 and the first transverse injection cavity 12 are bonded one-to-one with the second transverse injection cavity 31 and the second longitudinal injection cavity 31 to form a criss-cross injection cavity, and the diverter 5 slides from the longitudinal injection cavity from top to bottom. The diverter 5 includes a main base 56 and a receiving bucket 52 arranged on the top of the base 56. The receiving bucket 52 is made of elastic metal sheet, the interior of the base 56 is docked with the receiving bucket 52, and an opening is provided on each side of the base 56.
[0020] The first connecting seat 2 and the second connecting seat 4 work to push the front template 1 and the rear membrane plate 3 to close the mold, forming a crisscross injection cavity. The injection molding machine injects molten plastic into the injection cavity. From the perspective of the illustrated content, the injection port is above the injection cavity. The molten plastic flows from top to bottom in the longitudinal injection cavity to fill the injection cavity. After the molten plastic flows to the node, the diverter 5 guides the molten plastic and accelerates the molten plastic into the horizontal injection cavity. During injection, the receiving bucket 52 is attached to the inner wall of the longitudinal injection cavity. The flowing molten plastic flows into the base 56 through the guidance of the receiving bucket 52, and then flows from both sides of the base 56. The opening flows into the lateral injection cavity on both sides of the base 56. After one layer of lateral injection cavity is filled, the diverter 5 continues to move to the adjacent node below and stays, accompanied by the continued injection of molten plastic. After the molten plastic is re-docking with the diverter 5, the diverter 5 repeats the above operation and introduces the molten plastic into the lateral injection cavity at the current node. At the same time, the molten plastic fills the longitudinal injection cavity path through which the diverter 5 moves, and so on and so forth, gradually completing the filling of the entire injection cavity. The molten plastic is guided by the diverter 5 to complete the filling of the injection cavity, avoiding the occurrence of cavities in areas different from the injection flow direction.
[0021] Example 2 See Figures 4 to 8As shown, the outside of the base 56 is covered with an elastic sheath 51, which is embedded in the formed longitudinal injection cavity and fits the inner wall of the injection cavity. A receiving bucket 52 is provided on the top of the base 56, and the receiving bucket 52 is made of elastic metal sheet. A plurality of spiral push rods are provided on the diverter 5, including two first spiral push rods 53 in the receiving bucket 52 and two second spiral push rods 55 in the base 56. The output direction of the two first spiral push rods 53 is toward the base 56, and the two second spiral push rods 55 are located at the two openings of the base 56 and output to both sides. A telescopic sleeve 54 is provided on the opening of the base 56, and the telescopic sleeve 54 extends to both sides and wraps the second spiral push rods 55 inside.
[0022] The diverter 5 moves in the longitudinal injection cavity. During the movement, the elastic sheath 51 fits against the inner wall of the injection cavity. Due to the design of the injection molded product, the longitudinal injection cavity may have a certain curvature, and the elastic sheath 51 has a certain elasticity, so that the diverter 5 has a higher degree of freedom during the movement, reducing the possibility of being stuck in the injection cavity, and at the same time reducing the damage to the inner wall of the injection cavity when the diverter 5 moves, so as to ensure the quality of the injection molded product. At the same time, since the receiving bucket 52 is made of elastic metal and is connected to the base 56, during the movement, the influence of the arc-shaped longitudinal injection cavity on the connection between the receiving bucket 52 and the base 56 can be reduced, while ensuring the connection between the outer ring of the receiving bucket 52 and the inner wall of the injection cavity, so as to stably receive the molten plastic flowing inside the injection cavity.
[0023] As the base 56 moves, when the base 56 is in a non-node position, the elastic sheath 51 fits against the inner wall of the longitudinal injection cavity, and at the same time, the telescopic sleeve 54 is squeezed and shrinks inward into the elastic sheath 51. When it moves to the node, longitudinal space appears on both sides of the diverter 5, and the second spiral push rod 55 expands to both sides and connects to the horizontal injection cavities on both sides. At this time, the diverter 5 stops and injection molding is carried out at the same time. When the molten plastic flows to the node, the receiving bucket 52 receives the molten plastic, and the two first spiral push rods 53 in the receiving bucket 52 rotate to guide and extrude the molten plastic so that it flows into the base 56. At the same time, the two second spiral push rods 55 in the base 56 rotate to drain the molten plastic in the base 56 to both sides to merge into the horizontal injection cavities on both sides.
[0024] After the injection molding of the horizontal injection cavity at the current node is completed, the elastic sheath 51 continues to move to the next node. During the movement, since the telescopic sleeve 54 is a telescopic structure, it expands to both sides into the horizontal injection cavity. By adjusting the edge of the telescopic sleeve 54, refer to Figure 8As shown, the edge of the telescopic sleeve 54 is set as a table-like structure, so that the diverter 5 moves downward. When it detaches from the node, the telescopic sleeve 54 can be pushed toward the base 56, causing the telescopic sleeve 54 to shrink inward and continue to move to the next node.
[0025] See Figure 8 As shown, a micro motor is provided in the base 56 to drive two first screw push rods 53 and two second screw push rods 55 to rotate. Through the rotation of the first screw push rod 53, the molten plastic in the receiving bucket 52 is squeezed into the base 56 to increase the pressure of the molten plastic in the base 56, so as to provide a stable supply of raw materials to the second screw push rod 55, so that the rotation of the second screw push rod 55 can stably output the molten plastic to both sides, while increasing the filling speed of the transverse injection cavity. The larger filling pressure can also ensure the quality of injection molding. After the transverse injection cavity at the current node is filled with molten plastic, the second screw push rods 55 on both sides continue to rotate to output raw material therein to squeeze out the remaining cavity bubbles in the unknown position, thereby improving the quality of the injection molded product and reducing the occurrence of bubbles and cavities. In addition, since the injection molding process is carried out layer by layer, the injection molding of the next layer will be carried out only after the injection molding of the injection cavity of the previous layer is completed, so as to avoid air remaining in the injection cavity. When the subsequent nodes are injected, the residual air in the previous node cannot be discharged.
[0026] Example 3 See Figure 4 As shown, the rear diaphragm 3 is provided with a plurality of tail grooves 33 connected to the second longitudinal injection cavity 31. The tail grooves 33 are located at the tail of the second longitudinal injection cavity 31 and extend to the edge of the rear diaphragm 3. When the diverter 5 moves in the second longitudinal injection cavity 31, it can move into the tail grooves 33 and detach from the rear diaphragm 3 from the tail grooves 33.
[0027] The tail groove 33 can play a venting role. When the mold cavity is injected, the molten plastic is filled into the injection cavity, and the air in the injection cavity is discharged, so that the molten plastic can completely fill the injection cavity and reduce the residual bubbles during the injection molding process.
[0028] When the mold is performing injection molding of the last node, the node is at the connection between the tail groove 33 and the second longitudinal injection cavity 31, and the diverter 5 completes the diversion injection molding work of the corresponding transverse injection cavity at the node, and then the injection molding machine stops working, and the diverter 5 is taken out from the tail groove 33, and then the mold that matches the tail groove 33 is filled into the tail groove 33 from the edge to form a complete and closed mold. At the same time, in order to avoid residue, the inserted mold should push the molten plastic at the node to the second longitudinal injection cavity 31, and open an exhaust channel on the inserted mold so that the formed injection cavity forms a closed and air-free space. Then the injection molding machine continues to work, and the molten plastic is filled into the second longitudinal injection cavity 31, and the inserted mold is pushed back to the node, and then the entire injection molding process is completed.
[0029] It should be added that in order to ensure the quality of injection molded products and avoid cooling and hardening of the molten plastic in the early injection area, electric heating strips can be set in the area of the longitudinal injection cavity to heat the molten plastic and keep it in a molten state during the injection molding process.
[0030] In addition, in order to more clearly demonstrate the role of the diverter 5, the figure shows that the mold groove is staggered longitudinally and transversely. In actual production, the product grid produced can also be a diagonal cross-grid structure. Similarly, the diverter 5 can be set in the grid inclined to one side to guide the molten plastic to the grid inclined to the other side.
[0031] The diverter 5 can be moved by connecting a flexible pull rope to the bottom of the base 56 , passing the rope through the tail slot 33 , and pulling the diverter 5 and pulling it out of the tail slot 33 .
[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. An automobile bottom trim injection mold, comprising a front mold plate (1) and a rear mold plate (3), characterized in that: The front template (1) and the rear diaphragm (3) are respectively connected to a first connecting seat (2) and a second connecting seat (4), wherein the surface of the front template (1) is provided with a plurality of first longitudinal injection cavities (11) and a plurality of first transverse injection cavities (12), and the surface of the rear diaphragm (3) is provided with a plurality of second transverse injection cavities (31) and a plurality of second longitudinal injection cavities (31), and each of the plurality of second longitudinal injection cavities (31) is provided with a diverter (5). After the front template (1) and the rear diaphragm (3) are attached to each other, the first longitudinal injection cavity (11) and the first transverse injection cavity (12) are connected to the second transverse injection cavity (31). The injection cavity (31) and the second longitudinal injection cavity (31) are fitted in a one-to-one correspondence to form a crisscross injection cavity. The diverter (5) includes a main base (56) and a receiving bucket (52) arranged on the top of the base (56). The receiving bucket (52) is made of an elastic metal sheet. The interior of the base (56) is docked with the receiving bucket (52), and an opening is provided on each side of the base (56). The diverter (5) slides from top to bottom in the longitudinal injection cavity. The diverter (5) guides the flowing molten plastic in the longitudinal injection cavity to the transverse injection cavities on both sides through the opening.
2. The automobile bottom trim injection mold according to claim 1, characterized in that: The base (56) is sheathed with an elastic sheath (51) on its exterior. The elastic sheath (51) is embedded in a longitudinal injection cavity formed by the front template (1) and the rear membrane plate (3), and adheres to the inner wall of the injection cavity.
3. The automobile bottom trim injection mold according to claim 2, characterized in that: A plurality of spiral push rods are provided on the diverter (5), two first spiral push rods (53) are provided in the receiving bucket (52), and two second spiral push rods (55) are provided in the base (56). The output direction of the two first spiral push rods (53) is toward the base (56), and the two second spiral push rods (55) are located at the opening of the base (56) and output to both sides respectively.
4. The automobile bottom trim injection mold according to claim 3, characterized in that: A telescopic sleeve (54) is provided at each of the two side openings of the base (56), and the two telescopic sleeves (54) are elastically expanded to the two sides and respectively wrap a second screw push rod (55) therein.
5. The automobile bottom trim injection mold according to claim 4, characterized in that: The outer side of the edge of the telescopic sleeve (54) is a table-shaped structure, and the edge is embedded in the connection node between the transverse injection cavity and the longitudinal injection cavity.
6. The automobile bottom trim injection mold according to claim 1, characterized in that: The rear diaphragm (3) is provided with a plurality of tail grooves (33) communicating with the second longitudinal injection cavity (31). The tail grooves (33) are located at the tail of the second longitudinal injection cavity (31) and extend to the edge of the rear diaphragm (3).
7. The automobile bottom trim injection mold according to claim 6, characterized in that: When the diverter (5) slides up and down in the second longitudinal injection cavity (31), it can move into the tail groove (33) and detach from the rear membrane plate (3) from the tail groove (33).
8. The automobile bottom trim injection mold according to claim 3, characterized in that: A micro motor is provided in the base (56) for driving the two first screw push rods (53) and the two second screw push rods (55) to rotate respectively.