Automobile rear bumper injection mold

Abstract

The utility model discloses an automobile rear bumper injection mold which comprises a lower mold base and an upper mold base, a forming convex core is arranged at the upper end of the lower mold base, and a forming concave cavity is formed in the lower end of the upper mold base; an injection molding main plate is arranged above the upper mold base, a plurality of flow dividing injection molding pipes are arranged between the injection molding main plate and the upper mold base, and heating coils are fixedly embedded in the outer sides of the flow dividing injection molding pipes. According to the utility model, by adopting the design of a plurality of shunting injection molding pipes, multi-point synchronous injection molding is realized, the flowing path of a molten raw material is effectively shortened, and the influence of temperature reduction on the flowability of the raw material is reduced, so that the injection molding speed and efficiency are remarkably improved; the heating coil is fixedly embedded in the outer side of the shunting injection molding pipe, so that the temperature in the process is more uniform, the fluidity is better, the quality of an injection-molded automobile rear bumper product is higher, the defects caused by non-uniform temperature are reduced, and the stability and the precision in the molding process are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold for a rear bumper of an automobile. Background Art

[0002] With the continuous development of society and the continuous improvement of people's living standards, cars have become an indispensable means of transportation in modern life, and their number is increasing day by day. As a key component of the rear end of a car, the rear bumper not only absorbs energy and prevents collisions, but also affects the appearance and performance of the entire vehicle to a certain extent. Due to the lightweight properties and good energy absorption effect of plastic, the rear bumper of cars is currently widely manufactured from plastic.

[0003] However, the design and application of injection molds in the production of automotive rear bumpers still face numerous challenges. Traditional injection molds often utilize a single-port injection process. While simple, this approach has significant drawbacks. As the molten material flows through the injection channel, its temperature gradually decreases due to factors such as heat dissipation and friction, resulting in poor fluidity. This not only significantly reduces the injection speed but also increases the risk of channel blockage, severely impacting production efficiency and product quality. Therefore, addressing this issue through technological innovation and developing a more efficient and reliable automotive rear bumper injection mold is crucial. Summary of the Invention

[0004] The purpose of the utility model is to provide an injection mold for an automobile rear bumper to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an injection mold for a rear bumper of an automobile, comprising a lower mold base, wherein an upper mold base is provided above the lower mold base, and the upper edge of the lower mold base is tightly fitted with the lower edge of the upper mold base to form a sealing structure; the upper end of the lower mold base is provided with a molding convex core protruding upward, wherein the lower end of the upper mold base is provided with a molding cavity adapted to the molding convex core; an injection main board is provided above the upper mold base, wherein a plurality of diversion injection molding tubes are provided between the injection main board and the upper mold base; an injection molding nozzle is provided on the diversion injection molding tube, wherein the nozzle of the injection molding nozzle passes downward through the upper mold base and is connected to the molding cavity; a heating coil is fixedly embedded on the outside of the diversion injection molding tube, wherein the heating coil surrounds the outside of the injection molding nozzle; limiting guide columns are respectively provided at the four corners of the upper end of the lower mold base, wherein limiting holes adapted to the limiting guide columns are respectively provided at the four corners of the lower end of the upper mold base, and linear bearings are installed in the limiting holes.

[0006] Preferably, an injection port is provided in the middle of the injection main board, wherein the injection port is respectively connected to the diversion injection tube; and a mounting groove is provided at the top of the upper mold base, wherein the mounting groove is adapted to the diversion injection tube.

[0007] Preferably, a first telescopic cylinder and a second telescopic cylinder are respectively provided on the left and right sides of the lower mold base; a first clamping block is provided at the top end of the piston rod of the first telescopic cylinder, wherein the first clamping block abuts against the left end of the forming convex core; a second clamping block is provided at the top end of the piston rod of the second telescopic cylinder, wherein the second clamping block abuts against the right end of the forming convex core.

[0008] Preferably, two auxiliary forming seats are provided on the front and rear sides of the lower die seat, wherein the inner sides of the two auxiliary forming seats are respectively in contact with the front and rear ends of the forming convex core.

[0009] Preferably, two limiting grooves are symmetrically provided on the front and rear sides of the upper mold base, wherein the limiting grooves are adapted to the auxiliary forming base.

[0010] Preferably, elastic limiting blocks are respectively provided on the inner walls at both ends of the limiting groove, and limiting holes adapted to the elastic limiting blocks are respectively opened at both ends of the auxiliary forming seat.

[0011] Preferably, two third telescopic cylinders are symmetrically installed on the inner side wall of the limiting groove, wherein the third telescopic cylinder is arranged below the elastic limiting block; a third clamping block is provided at the top end of the piston rod of the third telescopic cylinder, wherein the third clamping block abuts against the front end of the forming convex core.

[0012] Preferably, a plurality of top blocks are movably embedded in the top of the forming convex core, wherein the upper end of the top block is integrally arranged with the upper surface of the forming convex core; a push rod is provided at the lower end of the top block, wherein the telescopic end of the push rod is fixedly connected to the top block, and the fixed end of the push rod is fixedly connected to the lower mold base.

[0013] Compared with the existing technology, the beneficial effects of the present invention are as follows: the present invention realizes multi-point synchronous injection molding by adopting the design of multiple diversion injection molding tubes, effectively shortens the flow path of molten raw materials, reduces the impact of temperature reduction on the fluidity of raw materials, and thus significantly improves the injection molding speed and efficiency; the multi-point injection molding design reduces the pressure in a single injection molding channel, reduces the risk of blockage due to poor fluidity of raw materials, and ensures the continuity and stability of production; by fixing and embedding a heating coil on the outside of the diversion injection molding tube, the temperature in the process is more uniform and the fluidity is better, so the injection molded automobile rear bumper product has higher quality and reduces defects caused by uneven temperature; by setting a first telescopic cylinder, a second telescopic cylinder, an auxiliary molding seat and a third telescopic cylinder, the molding convex core can be pressed and positioned in multiple directions during the injection molding process, ensuring the stability and precision of the molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2This is a rear view structural diagram of the utility model;

[0016] Figure 3 It is an explosion diagram of the utility model;

[0017] Figure 4 This is a structural diagram of the lower die base of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the upper die base of the utility model.

[0019] Among them: 1. Lower mold base; 2. Upper mold base; 3. Molding convex core; 4. Molding cavity; 5. Injection molding main board; 6. Diverter injection molding tube; 7. Injection molding nozzle; 8. Nozzle; 9. Heating coil; 10. Limiting guide pin; 11. Limiting hole; 12. Linear bearing; 13. Injection molding port; 14. Mounting slot; 15. First telescopic cylinder; 16. Second telescopic cylinder; 17. First clamping block; 18. Second clamping block; 19. Auxiliary molding seat; 20. Limiting groove; 21. Elastic limiting block; 22. Limiting hole; 23. Third telescopic cylinder; 24. Third clamping block; 25. Top block. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below with reference to the accompanying drawings.

[0021] Please refer to Figures 1 to 5 To achieve the above objectives, the present invention provides the following technical solutions:

[0022] An automobile rear bumper injection mold, comprising a lower mold base 1, wherein an upper mold base 2 is provided above the lower mold base 1, and the upper edge of the lower mold base 1 is tightly fitted with the lower edge of the upper mold base 2 to form a sealing structure, ensuring that the molten plastic will not leak during the injection molding process; an upwardly protruding molding convex core 3 is provided at the upper end of the lower mold base 1, wherein a molding cavity 4 adapted to the molding convex core 3 is provided at the lower end of the upper mold base 2, and the two together constitute the molding space of the automobile rear bumper; an injection mainboard 5 is provided above the upper mold base 2, wherein a plurality of diversion injection molding pipes 6 are provided between the injection mainboard 5 and the upper mold base 2, and these diversion injection molding pipes 6 are responsible for transporting the molten plastic from the injection molding machine to the molding area of the mold; an injection nozzle 7 is provided on the diversion injection molding pipe 6, wherein the nozzle 8 of the injection nozzle 7 downwardly penetrates the upper mold base 2 and is connected to the molding cavity 4, ensuring The molten plastic can be evenly filled into the molding space; a heating coil 9 is fixedly embedded on the outside of the diverter injection molding tube 6, wherein the heating coil 9 surrounds the outside of the injection nozzle 7, and the heating coil 9 is used to heat and insulate the molten plastic flowing through the diverter injection molding tube 6 to ensure that the plastic maintains an appropriate temperature during the injection molding process; limiting guide pillars 10 are respectively provided at the four corners of the upper end of the lower mold base 1, wherein the four corners of the lower end of the upper mold base 2 are respectively provided with limiting holes 11 adapted to the limiting guide pillars 10. This design is used to ensure that the upper mold base 2 and the lower mold base 1 can be accurately aligned when the mold is closed, reduce misalignment and deviation, and ensure molding accuracy. By installing a linear bearing 12 in the limiting hole 11, the friction and wear between the limiting guide pillar 10 and the limiting hole 11 during the mold closing process can be effectively reduced, thereby improving the service life of the mold.

[0023] See also Figure 3 As an embodiment of the present invention, an injection port 13 is opened in the middle of the injection molding main board 5 , wherein the injection port 13 is respectively connected to a plurality of branch injection molding pipes 6 .

[0024] In the above-described scheme, the injection molding main board 5 is an important component connecting the injection molding machine and the mold, wherein the injection molding main board 5 is responsible for distributing the molten plastic provided by the injection molding machine to each branch injection molding tube 6; an injection molding port 13 is provided in the middle of the injection molding main board 5, and the injection molding port 13 is the entrance for the molten plastic to enter the mold, wherein the size and shape of the injection molding port 13 are carefully designed to ensure that the molten plastic can flow in smoothly and reduce the pressure loss during the flow process; the injection molding port 13 is respectively connected to multiple branch injection molding tubes 6, such a design can realize multi-point injection molding, ensure that the molten plastic can be evenly distributed to each injection molding nozzle 7, and improve the injection molding efficiency and product quality.

[0025] See also Figure 3 As an embodiment of the present invention, a mounting groove 14 is provided at the top of the upper mold base 2 , wherein the mounting groove 14 is adapted to the diverter injection tube 6 .

[0026] In the above-described scheme, a mounting groove 14 is provided at the top of the upper mold base 2, and the mounting groove 14 is used to install and fix the diverter injection molding tube 6, wherein the size and shape of the mounting groove 14 are adapted to the diverter injection molding tube 6, ensuring that the diverter injection molding tube 6 can be firmly installed at the upper end of the upper mold base 2. This design enables the diverter injection molding tube 6 to remain stable during the injection molding process, ensuring that the molten plastic can be accurately injected into the molding space.

[0027] Please refer to Figure 3 and Figure 4 As an embodiment of the present utility model, a first telescopic cylinder 15 and a second telescopic cylinder 16 are respectively provided on the left and right sides of the lower mold base 1; a first pressing block 17 is provided at the top end of the piston rod of the first telescopic cylinder 15, wherein the first pressing block 17 abuts against the left end of the forming convex core 3; a second pressing block 18 is provided at the top end of the piston rod of the second telescopic cylinder 16, wherein the second pressing block 18 abuts against the right end of the forming convex core 3.

[0028] In the above-described scheme, when the first telescopic cylinder 15 is working, its piston rod will extend or retract, and the extension movement of the piston rod will drive the first clamping block 17 to move, so that it abuts against the left end of the molding convex core 3; by controlling the extension length of the piston rod of the first telescopic cylinder 15, the clamping force of the first clamping block 17 on the left end of the molding convex core 3 can be adjusted; during the injection molding process, the first clamping block 17 can clamp the left end of the molding convex core 3 to prevent it from being displaced or deformed under the injection pressure of the molten plastic, which helps to ensure that the molding convex core 3 and the molding cavity 4 of the upper mold base 2 maintain a correct alignment relationship, thereby producing products that meet the requirements. Automobile rear bumper product; when the second telescopic cylinder 16 is working, its piston rod will also extend or retract, and the extension movement of the piston rod will drive the second clamping block 18 to move, so that it abuts against the right end of the molding convex core 3; by controlling the extension length of the piston rod of the second telescopic cylinder 16, the clamping force of the second clamping block 18 on the right end of the molding convex core 3 can be adjusted; during the injection molding process, the second clamping block 18 can clamp the right end of the molding convex core 3, and also prevent it from being displaced or deformed under the injection pressure of the molten plastic; this also helps to maintain the correct alignment relationship between the molding convex core 3 and the molding cavity 4, thereby ensuring product quality.

[0029] Please refer to Figure 4 and Figure 5 As an embodiment of the present invention, two auxiliary forming seats 19 are provided on the front and rear sides of the lower mold base 1, wherein the inner sides of the two auxiliary forming seats 19 are respectively abutted against the front and rear ends of the forming convex core 3; two limiting grooves 20 are symmetrically provided on the front and rear sides of the upper mold base 2, wherein the limiting grooves 20 are adapted to the auxiliary forming seats 19.

[0030] In the above-mentioned scheme, the auxiliary molding seat 19 and the molding convex core 3 together constitute a complete molding space for the rear bumper of the automobile, wherein the auxiliary molding seat 19 can ensure that the molten plastic can fill the entire molding space when injected, thereby forming a product shape that meets the requirements; at the same time, the auxiliary molding seat 19 can also provide additional support and stability to prevent the molding convex core 3 from being displaced or deformed during the injection molding process; two limiting grooves 20 are symmetrically provided on the front and rear sides of the upper mold base 2, wherein the shape and size of the limiting grooves 20 are adapted to the auxiliary molding seat 19 to ensure that the two can fit closely; when the upper mold base 2 and the lower mold base 1 are closed, the limiting grooves 20 can accurately accommodate and position the auxiliary molding seat 19. This design ensures the stability and accuracy of the auxiliary molding seat 19 during the injection molding process and prevents it from being offset or tilted; through the close fit between the limiting grooves 20 and the auxiliary molding seat 19, the sealing performance of the mold can be further improved, the leakage of molten plastic can be prevented, and it is ensured that the automobile rear bumper injection mold can form a complete and accurate molding space during the injection molding process and produce high-quality products.

[0031] Please refer to Figure 3 、 Figure 4 As an embodiment of the present invention, elastic limiting blocks 21 are respectively provided on the inner walls at both ends of the limiting groove 20, and limiting holes 22 adapted to the elastic limiting blocks 21 are respectively opened at both ends of the auxiliary forming seat 19.

[0032] In the above-described scheme, when the auxiliary molding seat 19 is placed in the limiting groove 20, the lock head of the elastic limiting block 21 will automatically snap into the limiting hole 22 opened in the auxiliary molding seat 19, thereby realizing the positioning and fixation of the auxiliary molding seat 19; the design of the elastic limiting block 21 and the limiting hole 22 can ensure that the auxiliary molding seat 19 remains stable during the injection molding process, preventing it from shifting or falling off. This design also helps to improve the assembly accuracy and service life of the mold.

[0033] See also Figure 5 As an embodiment of the present utility model, two third telescopic cylinders 23 are symmetrically installed on the inner wall of the limiting groove 20, wherein the third telescopic cylinder 23 is arranged below the elastic limiting block 21; a third clamping block 24 is provided at the top end of the piston rod of the third telescopic cylinder 23, wherein the third clamping block 24 abuts against the front end of the forming convex core 3.

[0034] In the above-described scheme, when the third telescopic cylinder 23 is working, its piston rod will extend or retract, and the extension movement of the piston rod will drive the third clamping block 24 to move, so that it abuts against the front end of the molding convex core 3; during the injection molding process, the third clamping block 24 can clamp the front end of the molding convex core 3 to prevent it from being displaced or deformed under the injection pressure of the molten plastic; by controlling the extension length of the piston rod of the third telescopic cylinder 23, the clamping force of the third clamping block 24 on the front end of the molding convex core 3 can be adjusted, thereby ensuring product quality.

[0035] See also Figure 4 As an embodiment of the present invention, a plurality of top blocks 25 are movably embedded in the top of the forming convex core 3, wherein the upper end of the top block 25 is integrally arranged with the upper surface of the forming convex core 3; a push rod (not shown) is provided at the lower end of the top block 25, wherein the telescopic end of the push rod is fixedly connected to the top block 25, and the fixed end of the push rod is fixedly connected to the lower mold base 1.

[0036] In the above-mentioned scheme, multiple top blocks 25 are movably embedded in the top of the molding convex core 3, wherein the upper end of the top block 25 is integrally arranged with the upper surface of the molding convex core 3, which means that during the injection molding process, the upper end surface of the top block 25 and the upper surface of the molding convex core 3 together constitute the molding surface of the product; the design of the top block 25 is such that after the injection molding is completed, the top block 25 can be ejected from the molding convex core 3 by the telescopic movement of the push rod, thereby helping the product to be demoulded from the mold, wherein the upper end of the top block 25 and the upper surface of the molding convex core 3 that are integrally arranged ensure the molding accuracy and surface quality of the product during the injection molding process. Quality; the telescopic end of the push rod is fixedly connected to the lower end of the ejector block 25, and the fixed end of the push rod is fixedly connected to the lower mold base 1, so that the push rod can stably perform telescopic movement in the lower mold base 1; when the injection molding process is completed and the upper mold base 2 is separated from the lower mold base 1, the telescopic end of the push rod will extend to push the ejector block 25 to move upward, and the upward movement of the ejector block 25 will eject the molded product from the molding convex core 3. By controlling the telescopic length and speed of the push rod, the demoulding process of the product can be accurately controlled to avoid damage to the product, thereby improving production efficiency and ensuring product quality.

[0037] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. An injection mold for a rear bumper of an automobile, comprising a lower mold base (1), wherein an upper mold base (2) is provided above the lower mold base (1), and the upper edge of the lower mold base (1) is tightly attached to the lower edge of the upper mold base (2) to form a sealing structure; characterized in that, The upper end of the lower mold base (1) is provided with a molding convex core (3) protruding upward, wherein the lower end of the upper mold base (2) is provided with a molding cavity (4) adapted to the molding convex core (3); an injection molding main board (5) is provided above the upper mold base (2), wherein a plurality of diversion injection molding tubes (6) are provided between the injection molding main board (5) and the upper mold base (2); an injection molding nozzle (7) is provided on the diversion injection molding tube (6), wherein the nozzle (8) of the injection molding nozzle (7) passes through the upper mold base (2) downward and is connected to the molding cavity (4); a heating coil (9) is fixedly embedded on the outer side of the diversion injection molding tube (6), wherein the heating coil (9) surrounds the outer side of the injection molding nozzle (7); limiting guide columns (10) are respectively provided at the four corners of the upper end of the lower mold base (1), wherein limiting holes (11) adapted to the limiting guide columns (10) are respectively provided at the four corners of the lower end of the upper mold base (2).

2. The automobile rear bumper injection mold according to claim 1, characterized in that: An injection port (13) is provided in the middle of the injection molding main board (5), wherein the injection port (13) is communicated with the diversion injection molding pipe (6).

3. The automobile rear bumper injection mold according to claim 1, characterized in that: The top end of the upper mold base (2) is provided with a mounting groove (14), wherein the mounting groove (14) is adapted to the diversion injection molding tube (6).

4. The automobile rear bumper injection mold according to claim 1, characterized in that: A first telescopic cylinder (15) and a second telescopic cylinder (16) are respectively provided on the left and right sides of the lower die base (1); a first pressing block (17) is provided at the top end of the piston rod of the first telescopic cylinder (15), wherein the first pressing block (17) abuts against the left end of the forming convex core (3); a second pressing block (18) is provided at the top end of the piston rod of the second telescopic cylinder (16), wherein the second pressing block (18) abuts against the right end of the forming convex core (3).

5. The automobile rear bumper injection mold according to claim 4, characterized in that: Two auxiliary forming seats (19) are provided on the front and rear sides of the lower die seat (1), wherein the inner sides of the two auxiliary forming seats (19) are respectively in contact with the front and rear ends of the forming convex core (3).

6. The automobile rear bumper injection mold according to claim 1, characterized in that: Two limiting grooves (20) are symmetrically provided on the front and rear sides of the upper mold base (2), wherein the limiting grooves (20) are adapted to the auxiliary molding base (19).

7. The automobile rear bumper injection mold according to claim 6, characterized in that: Elastic limiting blocks (21) are respectively provided on the inner walls at both ends of the limiting groove (20), and limiting holes (22) adapted to the elastic limiting blocks (21) are respectively opened at both ends of the auxiliary forming seat (19).

8. The automobile rear bumper injection mold according to claim 7, characterized in that: Two third telescopic cylinders (23) are symmetrically installed on the inner side wall of the limiting groove (20), wherein the third telescopic cylinder (23) is arranged below the elastic limiting block (21); a third pressing block (24) is provided at the top end of the piston rod of the third telescopic cylinder (23), wherein the third pressing block (24) abuts against the front end of the forming convex core (3).

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